Portable Contamination Monitor, Model PCM-3, is a micro controller based, portable, light weight, battery operated instrument for measurement of environmental / field dose rate of gamma ray and x-ray radiation. It is useful for Health Physics applications in Nuclear Power Plants, Nuclear Medical Centres and Radio Isotope laboratories. Model PCM-3 employs external GM detector for direct readout of either dose rate in uR/hr, uSv/Hr, contamination in Bq/gm, Count Rate in CPS or CPM. With Pancake type GM tube, Model PCM-3 is useful for measurement of Contamination in Steel, other metals and alloys.
This pancake type GM tube is supplied externally with 1 meter long cable. Portable Radiation Survey Monitor, Model PCM-3, works on 6V rechargeable Ni-MH batteries. A mains operated charger is also supplied with PCM-3 for keeping the batteries charged. Typical operational battery charge life is 8 to 10 hours of continuous use.
Selection of Material, either Aluminium or Iron or Cast Iron or Copper is provided. In addition to these materials, user can add two more materials (of his choice) of different densities. User can enter material thickness between 0.1 mm to 999.9 mm. Backlit ON/OFF key allows user to turn OFF the backlit to enhance the battery charge. Backlit Time can be set as 1 or 2 or 5 minutes. Two line LCD display is used as interactive Menu for displaying Dose Rate in µR/Hr or Contamination in CPS or in Bq/gm and also to get the type of material and its thickness. Display of battery voltage and HV is also provided. No Pulse Alarm, Low Battery and HV Fail indications are also shown on LCD.
Calibration of PCM-3 is done at factory, using Co-60 radioactive sources supplied by BRIT, Mumbai. A small check source (Co60) can be supplied as an option at extra cost. Dose Rate Alarm setting is also provided to activate an LED indicator when the incident dose rate value exceeds the set alarm value.
Model PCM-3 is supplied with standard accessories like battery charger, operating manual and carrying case.
Specifications :
Detector
GM Tube
:
Pancake type, externally mounted with 1 meter long interconnecting cable
Micro R Survey Meter (Digital) Model DMRSM is a portable, Si-Lab
micro-controller based, battery operated instrument for measurement
of environmental low level gamma radiation dose rate. It employs an
internally housed 1”x1” NaI(Tl) detector integrally coupled to a 1” dia
PMT offering optimum performance to lower energies.
The unit can
measure and display dose rate in the range of 0-500 uR/Hr on a LCD
screen on the front panel. Other parameters such as alarm level set by
the user, the battery voltage and the HV applied to the detector are
displayed on the LCD screen. The front-panel controls include a
Potentiometer for setting dose rate alarm level, a power On/Off switch.
The alarm is adjustable over the entire scale range.
Model D-MRSM offers display of dose rate either in µSV/Hr or µR/Hr or in CPS. Alarm Level is settable in µSV/Hr or µR/Hr unit.
The mechanical design consists of the cast aluminium instrument housing with its sealed battery
compartment and an accompanying metal handle. Thus, it offers an industrial robustness and quality that
promotes long-lasting protection and instrument life.
Model DMRSM having very sensitive detector, is useful for Health Physics applications in Radioisotope
Laboratories, Nuclear Power Plants and nuclear medical centres. It is also useful for measurement of
radioactive contamination in steel, other metals & alloys.
Specifications :
Detector
:
1” dia x 1” thick NaI(Tl) detector with 1” dia PMT
Portable Radiation Survey Monitor Model PRSM-1 is a micro-controller based, portable battery operated instrument for measurement of environmental/ field dose rate of Gamma and X-ray radiations. It is useful for Health Physics applications in Radioisotope Laboratories, Nuclear Power Plants and nuclear medical centres.
MModel PRSM-1 employs either an internal or external GM detector for direct readout of either dose rate or counts for selected time interval. The GM Tube is selected considering the intended use of survey meter. PRSM-1, is powered by 4 nos of Ni-MH type rechargeable batteries. It is equipped with Audio Chirper and can be turned ON / OFF as per users choice. 16 X 2 Char LCD provides interactive Menu and Dose Rate Display / Counts.
Specifications :
Detector Probe
:
Halogen quenched GM Tube
Ranges
:
For Pancake GM Tube - Sensitivity 60 CPS/mR/Hr (upto 100 mR/Hr) For thin Walled GM tube – Sensitivity 18 or 22 CPS /mR/Hr **
PCM-2A, Contamination monitor is used for measurement of radioactive contamination in Nuclear Power Plants, Nuclear Medicine Centers. This instrument is ideally suitable for scanning material, tools, clothing, personnel etc. It is a mains operated unit & includes nuclear detector (GM tube) assembly probe and processing electronics. Indication of CRM in ranges of 0 to 10, 100 or 1000 CPS is available on 96 mm X 96 mm square, taut band meter. Range Selector switch enables user to select CRM range or HV or Alarm Level in percentage.
Specifications :
Detector Assembly (GM Tube)
Detectors
:
Thin walled GM Tube / Pancake type Frikser arrangement
(Other GM detectors also can be offered as option)
Housing
:
Chrome plated brass tube with shield to prevent beta detection
HV supply
:
0 to 1000 Volts @ 1 mA internally set at detector operating voltage
CRM and Failure Alarms
Alarms
:
Beeper and Red Flasher ON when count rate exceeds preset level
Set Point Adjustment
:
Adjustment over entire range
Reset
:
Push switch to clear alarm condition
Failure Alarm
:
Red Flasher alarm is continuously ON if no pulse is detected within 60 secs
No Pulse Alarm
:
Continuous ON Red LED
Count Rate Meter
Linear CRM
:
Three ranges of 0-10, 100 and 1000 CPS switch selectable
Accuracy
:
±5 % of full scale
Display
:
Taut band 96 x 96 mm square panel meter, 270° deflection pointer movement for indication of CRM, HV and Alarm Level
(Other GM detectors also can be offered as option)
Para Area Gamma Monitor Model PAG-4 is a micro-controller based; economical, stand-alone, mains operated instrument that uses GM tube as nuclear radiation detector. Necessary electronics & high voltage supply are housed in the equipment. PAG-4 has dose rate range 0 to 100 mR/Hr*. Audio and visual alarms turn ON if the dose rate level exceeds the set value. Alarm relay change over contact is provided for external control or indication. * Other ranges are also available on request
This unit is supplied with an Auto ranging direct reading 3+3 digit 7 segment LED display for dose rate, preset alarm level and information related to instrument status, self test etc.
PAG-4 is ideally useful for health physics applications in radioisotope laboratories, nuclear reactors, nuclear power plants, environmental survey labs, etc.
Alarm Level setting, Dose Rate calibration can be performed by using four keys keypad provided on inside subpanel. Optional key lock feature restricts the editing only to the authorized personnel preventing the other persons from tampering the calibration or changing the Alarm parameters.
Normal operating condition is indicated by illuminated large area Green LED. Red Flashing, large area LED accompanied by audio alarm indicates the dose rate alarm condition. On pressing acknowledge key, the instrument will return to normal condition or may continue to flash alarm condition as the case may be. HV status is indicated on inside subpanel LCD.
Status Indication :
Normal
Steady Green LED
Dose rate alarm
Flashing Red LED & Audio Alarm
On Acknowledge
Steady Red LED if dose rate alarm level persists
No pulse / detector Fail
Full Bright RED LED
Options
4 – 20 mA and / or 0 to 5V full-scale output proportional to dose rate
RS232 - for Hand held Comfigurator or PC COM port interface with data logging software
RS485 – Multi drop serial Communication. The monitor will be able to send the instrument data like Instrument ID, dose rate, alarm level and Indication. Data Acquisition software (optional)
Specifications:
Detector ( GM Tube)
Detector
:
GM tube suitable for 0 to 100 mR/Hr range
(* other GM detectors suiting user’s work also can be offered)
Radiation Detected
:
Gamma
Detector Housing
:
Internally mounted External detector (Optional) - The GM detector probe will be located external to the monitor with 1 meter interconnecting cable. GM tube will be housed in S.S or Aluminium enclosure
Cable length can be supplied upto 20 meters at extra cost (Optional)
Operating voltage
:
HV supply is factory set as per GM Tube specifications
Monitor
Design
:
Micro-controller based
Display
:
Auto ranging direct reading 6 digit seven segment LED display For dose rate, Alarm Level, status indication
Range
:
0.1 mR/Hr to 100 mR/Hr* (* Other ranges are available on request)
Response time
:
Response time is variable between 20 Secs to 1 Sec depending on dose rate
Accuracy
:
+/- 15 % through the range
Alarm range
:
0.1 mR/Hr to 99.9 mR/Hr
Front panel Keys
:
2 keys provided on front panel namely Acknowledge and Reset to reset Alarm and 4 keys pad to set Alarm and calibration factor on inside subpanel.
Indication
:
Large Area Green LED for Normal Indication , Large Area Red Flashing visual and Audio Alarm for dose rate OR Bright Red visual for No Pulse Alarm / detector Fail Alarm, HV fail LED / HV normal LED indication
Outputs
:
2 Change Over potential free relay contacts
Construction
:
Wall mounting type
Dimension
:
285 L x 135 D x 255 H mm
Options
:
4 to 20 mA and or 0-5V Full Scale Output, RS-232 / RS-485 with data logging software
Area Gamma Monitor, Model PAG3 operates on 230VAC, 50Hz mains supply. Purpose of this instrument is to measure and display the Gamma radiation activity of the surroundings. This instrument has internal GM tube which is capable of measuring gamma activity upto 1000 mR. Instrument has 7 segment LED displays (2” or 50 mm size) for dose rate indication in mR/Hr. For remote monitoring purpose, 4-20 mA output is available. The unit is suitable for continuous operation and useful for Health Physics applications in Radioisotope Laboratories, Nuclear Power Plants and nuclear medical centres.
Specifications:
Detector Probe
:
Halogen quenched GM Tube selected as per dose rate range needed
Ranges
:
0 – 1000 mR/Hr
Accuracy
:
± 20% of Range
Energy Range
:
100 KeV to 2 MeV
Response Time (sec)
:
not more than 5 Secs
High Voltage
:
0 to + 1200 Volts at 100 uA adjustable through 10 turn heliport with
calibrated dial available on sub panel
Controls
:
Available on sub panel internally mounted & access after opening the
hinged front door.
Display
:
16 x 2 Line display for Dose Rate Indication available on sub panel
½” or 2” 7 Segment LED for Dose Rate Indication on front panel
Output
:
4-20 mA output is provided
Alarm
:
Alarm adjustable throughout the range through LCD and Keypad
Alarm Indication
:
Red flasher and buzzer to indicate alarm condition
Para Plastic Scintillator Monitor Model PSAM-1 is designed to detect low activity nuclear contamination monitor. It employs two plastic scintillators for detection of gamma activity in the surrounding. Automatic measurement of background activity enables Model PSAM-1 to set lowest possible detection limit. Periodical measurement of background activity automatically sets new level of threshold above which aural and visual alarms are activated.
Model Simple to use, yet powerful enough to detect low level nuclear contamination, enables Model PSAM-1 to be used in applications like Nuclear Contamination in Steel. Model PSAM-1 contains a main readout unit with two plastic scintillator detectors coupled through two composite cables to the main readout unit. The signals generated by the detectors are continuously monitored by the microcontroller based circuitry used in the readout unit. Two 7 segment LED displays on the readout unit indicate the instantaneous values of counts (proportional to the incident nuclear radiation) from the two detectors. Audio and Visual Alarm indicators are turned on as soon as the set alarm limit is crossed by the incident radiation. Setting up of Alarm Level and Detection Time (Integration Time) is done through the keyboard and the 16x2 line LCD display. This LCD is also used for indicating various messages and menus.
Typical Applications
Area Monitoring
Contamination Measurement in Steel or any material
Portal Monitor
Gate Monitor
Specifications:
Detector Heads
Detectors
:
2 nos of 50 mm dia x 600 mm thick plastic scintillator with PMT
Integral assemblies
Front End Modules
:
2 nos of preamp, amplifier, SCA and HV circuit
HV Supply
:
2 nos, 0 to 1200V settable as per detector specification
Interface Cables
:
2 nos Composite cables max length 5 meter each
Readout Unit
Counters
:
2 nos of counters to give 999999 counts display
Displays
:
a) 2 nos of 7 segment LED displays for counts
b) 16 x 2 characters LCD display for menus and messages
Alarms
:
Cluster LED Red and Green for indication of Alarm and Normal Piezoelectric buzzer for Alarm Indication
Set Up
:
Counting Time interval – 0.5, 1.0 and 2 seconds
Alarm Level (sigma value) – 1 to 20
Background
:
Automatic measurement of background radiation
Supply Voltage
:
240V/50 Hz AC mains (±10%)
Enclosure
:
ABS plastic box with transparent door, wall mounting arrangement
Model CAM A/B is a Continuous Air Monitoring system with independent Alpha and Beta Channels. CAM A/ B is designed and manufactured indigenously by Para Electronics Mfg. Division of Electronic Enterprises (I) Pvt. Ltd. for Continuous Monitoring of Alpha and/or Beta activity in the surrounding atmosphere.
Electronic flow measurement enables user to get the activity reading in Bq/M3, Time totalized air flow measurement provides information on the amount of air sampled in the given time. However, CAM system is also available with standard Rotameter type air flow measurement providing only CPM Display. There is no interaction between air flow lines, since independent pumps are used for Alpha and Beta channels.
Connectivity of CAM to network or PC is provided through RS-485 /RS 232. Modbus based Data Transfer software is supplied as an option.
Continuous Air Monitoring System CAM is housed in 19” mechanical trolley with two compartments. These compartments house the main electronic Instrument on the top side. Alpha/Beta detectors, lead shield for Beta channel, Flow measurement, Sample Changing mechanisms and two independent Air Sampling Pumps are housed in the lower compartments.
Standard version of CAM A/B includes
Alpha Channel with 2” dia ZnS(Ag) scintillation detector mounted on 2” dia PMT, Air Sampling System with electronic flow meter, Easy-to- Replace Filter Paper Holder Arrangement, 100 LPM independent air sampling pumps.
Beta Channel with 20 mm dia End Window GM tube, Air Sampling System with electronic flow meter, Easy-to- Replace Filter Paper Holder Arrangement, 100 LPM separate air sampling pump
Common Electronic Microcontroller unit with independent HV supplies, Pulse Processing Circuits, Counters, Flow Measurement and Display of Air Flow, CPM and Bq/M3 for each channel. 6 digit LED display for CPM and 4 x 20 Char LCD for menu, Bq/M3, Flow and other menus
Low and High Level Count Rate Alarms, 4-20mA output, Potential Free Relay Contact outputs, Green, Red Tower Lamps with Flasher and Audio Alarms for each channel
Calibrate Mode to calibrate the activity in Bq using reference sources, Flow in LPM using standard Flow Meter
Electronic Readout Unit uses 2 LED displays for CPM indication. 4 x 20 Character LCD is used for various menus, Bq/M3 and flow reading. 6 Keys pad enables user to set up the parameters and also calibrate the instrument for Flow and Activity measurement.
Keylock is provided to prevent unauthorized tampering of the set up.
2” dia ZnS(Ag) Scintillator based Alpha Detector is mounted on 2” dia PMT. Voltage Divider and Preamplifier are also housed in the detector assembly. This detector gives better than 25% efficiency.
Beta detection is done by 25mm dia GM tube type 72314 from LND USA. GM tube is covered by 25 mm thick lead shield to reduce the gamma background. Beta efficiency is around 10 ~12%
Electronic Flow sensors are employed for measurement of air flow in LPM. The flow totalizer gives the integrated value of air volume that has passed through the filter paper in the given time. This gives accurate estimates of Bq/M3.
These flow sensors are calibrated against standard turbine type flow meter for the range 20 to 100 LPM
Two independent air sampling pumps with 117 LPM (free air) capacity are used for Alpha and Beta Channels. Use of separate pumps removes any interaction of air flow between Alpha and Beta channels.
Since Air Flow measurement is carried out by electronic flow meter, conventional Rotameters are not required in the air line. Air flow is adjusted by the vent valves provided at the inlet side of the pump(s).
Elegant yet simple, design of CAM enables user to change the filter paper(s) without disturbing the detector mounting arrangement. Air Sampling Pumps are rated for continuous operation. Rotameter flow measurement is also possible as an alternative to electronic flow measurement.
CAM is also available in only Alpha, only Beta or both Alpha and Beta versions.
Specifications:
Parameter
CAM A / B
CAM A
CAM B
No. of Channels
2” dia ZnS(Ag) Scintillator on 2” dia PMT
20 mm dia End Mica Window GM tube with 25 mm thick lead shield
Filter Paper Arrangement
2” dia filter paper mounting, with easy-to-replace filter holder in sampling system for Alpha Channel
2” dia filter paper mounting, with easy-to-replace filter holder in sampling system for Beta Channel
Flow Measurement
Electronic or by Rotameter (0 to 100 LPM Range)
Electronic or by Rotameter (0 to 100 LPM Range)
Air Sampling
Continuous rated air sampling pump (100 LPM) for Alpha channel
Continuous rated air sampling pump (100 LPM) for Beta channel
HV supply
0 to 1000V preset for alpha channel
0 to 1000V preset for beta channel
Display
6 digit LED for CPM
4 x 20 Char large LCD for
Bq/M3,Flow,Alarm Levels
6 digit LED for CPM
4 x 20 Char larg LCD for
Bq/M3,Flow,Alarm Levels
Model ALCAM is a Continuous Air Monitoring system developed for alpha counting in air. ALCAM is designed and manufactured indigenously by Para Electronics Mfg. Division of Electronic Enterprises (I) Pvt Ltd for Continuous Monitoring of Alpha activity in the surrounding atmosphere.
Electronic flow measurement enables user to get the activity reading in Bq/M3, Time totalized air flow measurement provides information on the amount of air sampled in the given time. However, CAM system is also available with standard Rotameter type air flow measurement providing only CPM Display.
Model ALCAM provides inlet connection for connecting the air suction vacuum line. However, air sampling pump unit also can be supplied as an optional accessory. It is expected that the flow range should be between 40 to 70 LPM. Rotary vanes based dry pump with open air suction capacity up to 125 LPM is supplied for 24 hours nonstop operation as an optional accessory.
Connectivity of ALCAM to network or PC is provided through RS-485 / Ethernet. Modbus based Data Transfer software is supplied as an option. MODBUS protocol based registers’ output is made available for data transfer.
Wall mountable Continuous Air Monitoring System model ALCAM is supplied in rack. This rack (depth 23 cms) contains the 2” dia ZnS(Ag) Alpha detector on 2” dia PMT, Filter holder assembly, air flow measuring unit and electronic unit for display of Alpha activity.
Specifications:
Parameter
ALCAM
No. of Channels
Alpha
Detector
2” dia ZnS(Ag) Scintillator on 2” dia PMT
Filter Paper Arrangement
2” dia filter paper mounting, with easy-to-replace filter holder in sampling system for Alpha Channel
Flow Measurement
Electronic or by Rotameter (0 to 100 LPM Range)
Air Sampling
Continuous rated air sampling pump (100 LPM) for Alpha channel
HV supply
0 to 1000V preset for alpha channel
Display/td>
6 digit LED for CPM
4 x 20 Char large LCD for Bq/M3,Flow,Alarm Levels
Ranges
50, 500, 5000 or 50000 CPM settable
Calibration
Air Flow and Counting Efficiency
Alarms
Green / Red Cluster LEDs with audio alarm
Alarm Setting
Warning and High CPM Alarm
Low and High for Air Flow
Outputs
Potential free Relay contacts,
4-20mA Output
RS-485(Modbus) or Ethernet
Air Flow Pump (optional)
Independent pump 126 LPM open flow with silencer
Flow Control
By Vent Valve with inlet air filter
Mechanical Enclosure
Powder coated Wall Mounting Rack ( 60 cm L x 23 cm W x 47 cm )
Laundry Monitor is developed for manual monitoring of beta/gamma contamination of
clothing like lab-coats (aprons), boiler suits, hand gloves or shoe covers used
by personnel in radioactive area in nuclear power plants/research labs. Normally
these clothing are checked for contamination and segregated into active and non-active
lots before sending out of the plant for processing by plant laundry. It is a practice
to check inward laundry also to confirm whether the cloths are non-contaminated
before use.
Para Electronics has supplied laundry Monitors of different configurations i.e.
BOX type or FLAT BED type. Both these configurations use energy compensated GM Tubes.
However beta/gamma sensitive tubes also can be supplied.
BOX Type Laundry Monitor
In BOX Type Laundry Monitor the system has Detector Head (measurement zone) adequate
for type of laundry to be monitored. The measurement zone is covered by set of thin
walled GM Tubes to measure beta/gamma radiations from the laundry. Relevant processing
electronics is housed around the measurement zone. Suitable LED indicators are provided
around the measurement zone to indicate zonal contamination level or hot spots of
the laundry being monitored. Alarms and contamination level is indicated on contamination
monitor (main measuring instrument) in CPS value in accordance to the user specifications.
The size and shape of the measurement zone, contamination level ranges and background
activity subtraction can be suitably modified to any different requirements.
Detector Head
18 energy compensated GM tubes
6 HV supply and front end
Electronic circuit PCBs
Contamination Monitor with Analog readout
0-500, 5K and 50 K CPS ranges
Audio/Visual alarm
Beta Gamma sensitive tubes as option
Background subtraction ON or OFF
Compact, easy to use
No Pulse, high counts, count rate alarms
Analog 0 to 207 degree meter indication
240V AC mains operation
Alarm Settings : 0 to 100% of range
Flat Bed Type Laundry Monitor
FLAT BED type design employs 24 GM Tubes housed in 12 SS trays with lead lining.
Each tray has HV supply and counting electronics for two tubes. The output from
each tray is sent to the main counter unit which houses 12 independent counters.
Background subtraction, No pulse Alarm, MIMIC Display and Audio/Visual Alarms are
the standard features for Laundry Monitor. Automatic sensing of the laid cloth is
detected by photo sensor and the counting is activated. MIMIC display gives indication
of high contamination zones.
Specifications:
24 energy compensated GM tubes housed in 12 SS trays
Separate HV supply 6 and front end electronics PCB per tray
Micro controller based counter with set up and operate mode
>240V AC mains operation
Counts from each tray are counted seperately
Audio/ Visual alarm
Alarm setting : 0 to 100% of range
Beta/ Gamma sensitive tubes as option
Background subtraction ON or OFF
MIMIC display for detection of high contamination zones
Scrap Monitor Model PSM-1 developed by Para Electronics is to cater the requirement
of monitoring scrap for possible gamma contamination. This Monitor employs 6 nos.
of energy compensated GM tubes. These thin walled GM tubes will be mounted parallel
to the length of the Scrap Monitor. The housing of these GM tubes can be moved vertically
for a span of nearly 700 mm. It’s lower most position will be at 40 mm from ground
level and the highest position will be at 300 mm .The output of these GM Tubes will
be OR tied and will be fed to Scrap Monitor’s display unit. This display unit consists
of Count Rate Meter, Audio / Visual settable alarms, facility to subtract background
level. Count Rate Metering circuit has 3 Ranges namely, 0 to 500 CPS, 0 to 5000
CPS and 0 to 50000 CPS. The alarm level can be set between 0 to 100% of any range.
Analog Meter with 2700 square dial will indicate the CPS level. The integration
time can be set to either 1 sec or 5seconds. Alarm levels are indicated on the same meter by setting the band switch to appropriate position.
Contamination Monitor has a facility to subtract the background. It is possible
to subtract the background upto 500 CPS. User can select background subtraction
by setting background subtraction switch to ON position.
Typical Specifications :
Detector Head
Mechanical Dimensions
:
Overall Dimensions :
700 W x 500 H x 500 D mm (approx)
Detector Housing with Stainless Steel Bottom :
700 W x 500 H x 100 D mm (approx)
Detector(s) used
:
Thin walled Halogen quenched GM Tubes with overall length 280 mm and diameter 28
mm
No of GM Tubes
:
6
HV Supply modules
:
One HV supply module per 3 GM tubes
No of HV modules
:
2
HV Output
:
Internally settable up to +900 V
Detector Head Output
:
OR tied TTL output from all the GM tubes will be fed to the contamination monitor.
All outputs will be effectively averaged over the integration time 6 core cable
3 meter long
Display Unit (Contamination Monitor)
Count Rate Ranges
:
0 to 500 CPS, 0 to 5000 CPS, 0 to 50000 CPS
Three switch selectable ranges
Input
:
TTL Input pulses from Detector Head
Alarm Level
:
Settable Alarm Level between 0 to 100% of selected range
Alarm Level Adjust
:
Single turn potentiometer screw driver settable mounted on rear panel User can set
Alarm Level between 0 to 100% of
selected range
Alarm Indication
:
Visual - RED flashing LED indicator
Audio – Audio Alarm
External – Relay change over contact
Alarm Acknowledge
:
Front panel mounted push switch to reset the audio alarm. Visual alarm will switch
off when the contamination level goes below the set value
Integration Time
:
1 or 10 seconds switch selectable
CRM Indication
:
100 mm x 100 mm square, 0 to 2700 Analog Meter
Background Subtraction
:
0 to 500 CPS settable by 10 turn helipot with graduated dial
Mechanical
Detector Head
Enclosure
:
Aluminum Powder Coated Box
Typical Dimensions
:
807 W x 850 H x 400 D mm
Trolley
Steel Frame with adjustable vertical height for detector head
Foot Monitor Model PFT-1 manufactured by Para Electronics is developed to detect
the nuclear contamination on the shoes. This unit is designed around 4 nos of thin
walled GM tubes (typ1 719) for detection of beta/gamma contamination on the bottom
of the footware. A pulse from each GM tube is counted independently before all the
counts are added together to determine if the aggregate counts are below the set
level. Counting time, Alarm level are user settable. Audio/Visual alarms are provided
when the contamination level crosses the set limit. LCD menu display indicates the
status of the contamination and is used for diagnostic purposes also. The detection
of person's standing is done by the pulses from GM tubes.
GM tubes, 4 nos used in Model PFT-1 are surrounded by 6 mm thick lead shield. This
reduces the background counts. Foot Monitor continuously counts the background counts
and stores the latest background. These background counts are subtracted from the
actual counts. Net counts are used fro alarm activation.
Typical Specifications :
Detector Assembly
Detectors
:
4 nos of thin walled GM tubes type 719 or equivalent
( 2 GM tubes per foot)
Lead Shield
:
6 mm thick lead shield on five sides around the GM tubes
S. S. Grill
:
On the top of the GM tubes
Light Switches
:
2 nos to detect the standing of the person on the foot monitor
Counter / Alarm Assembly
Electronics
:
Micro controller based counter with 16x2 Line character LCD
menu display for counts and other messages
Alpha Particulate Monitor Model PAM-1 developed by Para Electronics consists of
following subsystems
Detector, Preamplifier, Filter Paper Holder
Instrument for data collection
Panel PC for display, operation control, data storage and communication
Vacuum pump
UPS
Complete system is assembled on a trolley. System consists of a detector, preamplifier
with filter paper holder. Detector is Ion Implanted Silicon Detector.Pre-Amplifier
is directly mounted on the detector.Active area of the detector faces the filter
paper.Filter paper is kept inside the filter paper holder
Preamplifier requires +12V and -12V supply. Detector bias voltage is around 30 volts.
Multicore cable with one coaxial is used to carry the necessary voltage and the
preamplifier output between the preamplifier and the instrument. 6 pin allied connector
is used at the instrument end. Cable is directly soldered to PCB at the preamplifier
end.
Power supply for the instrument consists of +5V SMPS for digital circuits. For +12
and -12V, linear supply is used. Inside the instrument, there is a power supply
card and the MCA card. Necessary bias for the detector is generated on the power
supply card.
Preamplifier output first goes to spectroscopy amplifier. Rise time of the amplifier
output is 1.2 uS. Amplifier output is then given to 10 bit Wilkinson type ADC. Necessary
signals for control of ADC are generated by the main controller C8051F340. This
controller also handles the USB communication with the panel PC. Spectrum collected
by 1K channel MCA is first stored in the internal memory of the PC. Then after every
second, the spectrum is transferred to software package which runs on the panel
PC. The spectrum collected by the MCA is displayed on the PC screen. Many other
features like data storage are available in the package.
Mains supply is routed through the spike guard. Vacuum pump is connected on the
mains line whereas the instrument and the panel PC are connected to the UPS as shown
the block diagram. UPS capacity is 500 VA. This gives backup time of at least 1
hour in case of power failure.
Vacuum pump capacity is 100 LPM. Normal suction rate through filter paper is 40
LPM. This generates back pressure on the pump and results in pump failure. Bypass
valve is connected on the suction line of the pump as shown in the diagram to avoid
the back pressure on the vacuum pump.
Specifications :
Air Monitor Detection Unit
1K MCA based Unit for detection of Alpha particles
Supply :
230V, 50 Hz Mains
Radiation Detection :
4.2 MeV to 8 MeV
System Resolution :
300 KeV
Display :
In CPM and Bq/m3
Pre Amplifier
Detector Type :
Ion Implanted Silicon Detector
Resolution :
20 KeV in Vacuum
Active Area :
450 mm2
Bias Voltage :
+30 Volts
Pre Amplifier
Type :
Low Noise Charge Sensitive Preamplifier
Output :
100 mV for 5.16 MeV
Gain :
600 mV/pC
Pulse Polarity :
Positive
Interconnecting cable length between preamplifier and amplifier - 3 meters
Amplifier
Input :
0 to +500 mV
Output :
0 to + 5 Volts
Shaping :
1 uS, Near Gaussian shape
Gain :
Variable through internal trimpot
HV
Range :
100 V
ADC
ADC Type :
10 Bit Wilkinson Type
ADC Range :
5 Volts
No. of Channels :
1024Secs
Display & Storage System / Panel PC
Industrial Panel PC or Laptop with Windows XP (License version) operating system
for display of MCA spectrum, data analysis
and spectrum storage. PC will have RS232/RS485 or Ethernet port for data communication.
12” LCD Monitor for display.
Display Resolution At least 1024 x 760 pixels
Alarms
Warning Alarm Level & Final Alarm Levels settable in terms of Bq/m3.
Flow Meter
Digital Flow meter for flow rate measurement.
Range 0 to 100 LPM
Others
Temp. Range :
0 to 55O C
Air Sampling Unit
SS Air Sampling head capable of holding filter paper of 37 mm dia. Collection efficiency
>95%.
Flow range 10 to 100 LPM
Filter Paper Millipore type. Wire mesh for supporting filter paper.
Vacuum Pump - Oil less, Capacity 100 LPM with 12.7mm dia inlet and outlet ports
Digital Flowmeter, range 0 to 100LPM for flow rate measurement.
Bypass valve for bypassing excess flow.
Suitable Trolley will be provided for entire system with grills for ventilation.
Model RPM-1 is a Portal or Gate Monitoring system with two plastic scintillators forming two sides of the portal. Model RPM-1 is designed and manufactured indigenously by Para Electronics Mfg. Division of Electronic Enterprises (I) Pvt. Ltd. for monitoring gamma contamination on persons walking through it.
1980 mm H x 280 mm W x 48 mm T are typical dimensions of plastic scintillators on which a 2” dia PMT is mounted. Detectors are covered with 5 mm lead sheet to minimize background radiation. They are fitted in steel frames covered with SS covers. The inner sides of the detectors are covered with a thin plastic sheet. Detector electronics includes HV supply, preamplifier, amplifier and single channel analyzer are housed in a pluggable encloser on the PMT socket. TTL outputs from both the channels serve as input to the counters used in the readout unit.
Readout unit uses Silab microcontroller which indicates the counts and background of both channels on 4 x 20-character LCD. 8 Keys are also provided to carry out the setup, which allows user to select the operating mode, counting time, background counts and alarm counts. Portal Monitor, Model RPM-1, uses PIR sensor, camera and IR based occupancy sensors to detect and record the presence of person. Image of the person & contamination level are recorded on PC which is coupled through ethernet.
Portal Monitor, Model RPM-1 offers two modes of operation, i.e. Walk-Through and Stop & Count. In Walk Through mode, person can simply walk through the portal and the measurement is carried out while the person is crossing the frame. In Stop & Count mode, person is expected to stand in the frame for set duration of time. Measurement is completed when the person moves out of the frame. Capturing the photo of the person, detection of presence of person in the portal frame, is done while the person is approaching the frame and then passing through it.
Information acquired by camera and detectors is communicated to PC, connected through ethernet cable. This information is permanently stored in PC memory for viewing later. Software written for this application allows user to see the alarm status, counts information and photo of the person at a remote location. Detector fail, high background, Count Rate alarm conditions are detected and indicated locally on tower lamp with audio alarm. User can carry out setup through PC software as well. This information is also displayed on PC, LCD as well as on the remote alarm indication and display box supplied as an option.
Model CAM C is a Continuous Air Monitoring system with plastic scintillator based composite detector for simultaneous measurement of Alpha and Beta Channels. CAM C is designed and manufactured indigenously by Para Electronics Mfg. Division of Electronic Enterprises (I) Pvt. Ltd. for Continuous Monitoring of Alpha and Beta activity in the surrounding atmosphere.
Electronic flow measurement enables user to get the activity reading in Bq/M3, Time totalized air flow measurement provides information on the amount of air sampled in the given time. However, Model CAM C system is also available with standard Rotameter type air flow measurement providing only CPM Display. The major advantage of CAM C is use of single detector and hence single air sampling, air flow measurement system.
Use of single composite detector makes the system economical, easy to maintain, yet it offers all the advantages of independent Alpha and Beta detectors. The Composite detector offers excellent isolation between Alpha and Beta channels.
Connectivity of CAM to network or PC is provided through ETHERNET. Modbus based Data Transfer software is supplied as an option.
Model CAM C is housed in 19” mechanical trolley with two compartments. These compartments house the main electronic Instrument on the top side. Composite detector with lead shield, Flow measurement, Sample Changing mechanism and one Air Sampling Pump.
Elegant yet simple, design of CAM C enables user to change the filter paper without disturbing the detector mounting arrangement. Air Sampling Pump is rated for continuous operation. Rotameter flow measurement is also possible as an alternative to electronic flow measurement.
Model CAM C includes 2” Plastic Scintillator coated with ZnS(Ag) scintillation detector mounted on 2” dia PMT, Air Sampling System with electronic flow meter, Easy-to- Replace Filter Paper Arrangement, 100 LPM air sampling pump of continuous rating.
Electronic Microcontroller unit with independent HV supplies, Pulse Processing Circuits, Counters, Flow Measurement and Display of Air Flow, CPM and Bq/M3 for each channel. 6 digit LED display for CPM and 4 x 20 Char LCD for menu, Bq/M3, Flow and other menus
Low and High Level Count Rate Alarms, 4-20mA outputs, Relay Contact outputs, Green, Red Tower Lamps with Flasher and Audio Alarms for each channel
Specifications (CAM C System)
Parameter
CAM C
ALPHA CHANNEL
BETA CHANNEL
No. of Channels
One
One
Detector
2" dia ZnS(Ag) Scintillator coated on 2" dia 0.1" thick plastic scintillator mounted on 2" dia PMT, Lead Shield 25 mm thick around. Typical specifications are as below
Efficiency
20 ~ 25% for Am241
Better than 12 % for Sr90
Crosstalk
Beta to Alpha: <1%
Alpha to Beta <10%
Background
5~10 CPH
5~10 CPM
Filter Paper Arrangement
2" dia filter paper mounting, with easy-to-replace filter holder in sampling system
Flow Measurement
Electronic or by Rotameter (0 to 100 LPM Range)
Air Sampling
Continuous rated air sampling pump (100 LPM) for Alpha and Beta channels
HV supply
0 to 1000V preset for alpha channel
0 to 1000V preset for beta channel
Display
6 digit LED for CPM
4 x 20 Char large LCD for Bq/M3,Flow,Alarm Levels
6 digit LED for CPM
4 x 20 Char large LCD for Bq/M3,Flow,Alarm Levels
Model APCM-1 is a wall mountable Alpha Palm Contamination Monitor developed for measurement and detection of alpha contamination on Palm. APCM-1 is designed and manufactured indigenously by Para Electronics Mfg. Division of Electronic Enterprises (I) Pvt. Ltd. Mumbai, India.
Model APCM-1 uses of 180 x 115 mm2 ZnS(Ag) based Alpha Scintillator mounted on 78 mm dia PMT for detection of Alpha Particles on palm/hand. This detector is covered with Mylar layers to protect it from ambient light. A demountable hexagonal SS mesh is provided on the Mylar layer to protect it from accidental touching and damaging it. It is also possible to remove this SS mesh for decontamination if required.
The detector is mounted upside down so that the palm can be held below the SS mesh, thereby reducing the chances of alpha particles falling on active area of the detector. One IR sensor and other touch switch sensor detect the presence of palm automatically. This will automatically start the measurement for preset time. At the end of measurement, if the measured value is greater than the set alarm value, appropriate message, and audio, visual alarm indications are provided. Should the palm moves during the measurement time, the measurement is aborted with message on LCD.
Model APCM-1 is a mains operated unit which includes the HV supply for detector, front end electronics and micro controller for all the operations. Setup mode allows user to set the counting time, alarm level (CPS) and background subtraction ON or OFF. While there is no palm under the detector, instrument measures the background level which is used for getting the net counts in CPS for alarm activation.
Model APCM-1 is useful for detection of alpha contamination on palms. It is designed for ease of measurement to be used for health physics application in nuclear facilities like R&D labs, nuclear power plants etc.
Model APCM-2 is a wall mountable Alpha Palm Contamination Monitor developed for measurement and detection of alpha contamination on Palm. APCM-2 is designed and manufactured indigenously by Para Electronics Mfg. Division of Electronic Enterprises (I) Pvt. Ltd., Mumbai, India.
Model APCM-2 uses 2 nos. of 180 x 115 mm2 ZnS(Ag) based Alpha Scintillator mounted on 78 mm dia PMT for detection of Alpha Particles on palm/hand. This detectors are covered with Mylar layers to protect it from ambient light. A demountable hexagonal SS mesh is provided on the Mylar layer to protect it from accidental touching and damaging it. It is also possible to remove this SS mesh for decontamination if required.
The detector is mounted upside down so that the palm can be held below the SS mesh, thereby reducing the chances of alpha particles falling on active area of the detector. One IR sensor and other touch switch sensor detect the presence of palm automatically. This will automatically start the measurement for preset time. At the end of measurement, if the measured value is greater than the set alarm value, appropriate message, and audio, visual alarm indications are provided. Should the palm moves during the measurement time, the measurement is aborted with message on LCD.
Model APCM-2 is a mains operated unit which includes the HV supply for detector, front end electronics and micro controller for all the operations. Setup mode allows user to set the counting time, alarm level (CPS) and background subtraction ON or OFF. While there is no palm under the detector, instrument measures the background level which is used for getting the net counts in CPS for alarm activation.
Model APCM-2 is useful for detection of alpha contamination on palms. It is designed for ease of measurement to be used for health physics application in nuclear facilities like R&D labs, nuclear power plants etc.
Left: 128 mm (L) x 118 mm (W), ZnS(Ag) Scintillator on 78 mm dia PMT with Perspex light guide
Right: 128 mm (L) x 118 mm (W), ZnS(Ag) Scintillator on 78 mm dia PMT with Perspex light guide SS
SS Mesh Arrangement
Removable Hexagonal SS mesh for decontamination
Display
2 x 16 char. LCD for menu and other messages
Keypad
4 Keys to set the parameters
Palm Detection
Left: Automatic using one IR switch and one touch switch
Right: Automatic using one IR switch and one touch switch
Efficiency
Better than 25% at all locations
Background Subtraction
ON or OFF, software settable
HV supply
0 to 1000 V internally preset
Counting Time
Settable between 1 and 999 seconds
Alarm
Green / Red bright LEDs with audio buzzer
Alarm Setting
Level - 1 to 999 CPS, software settable
Mechanical Enclosure
Powder coated Wall Mountable Steel housing Dimensions: 220 W x 360 H x 260 D m
Model CPCM-1 is a wall mountable Alpha Palm Contamination Monitor developed for measurement and detection of alpha and Beta contamination on Palm.CPCM-1 is designed and manufactured indigenously by Para Electronics Mfg. Division of Electronic Enterprises (I) Pvt. Ltd., Mumbai, India.
Model CPCM-1 uses 2 nos. of 120 x 110 mm2 ZnS(Ag) based Alpha Scintillator adhered to0.10" thick plastic scintillator mounted on 78 mm dia PMT with Perspex light guide for detection of Alpha and Beta Particles on palm/hand. This detectors are covered with Mylar layers to protect it from ambient light. A demountable hexagonal SS mesh is provided on the Mylar layer to protect it from accidental touching and damaging it. It is also possible to remove this SS mesh for decontamination if required.
The detector is mounted upside down so that the palm can be held below the SS mesh, thereby reducing the chances of alpha/Beta particles falling on active area of the detector. One IR sensor and other touch switch sensor detect the presence of palm automatically. This will automatically start the measurement for preset time. At the end of measurement, if the measured value is greater than the set alarm value, appropriate message, and audio, visual alarm indications are provided. Should the palm moves during the measurement time, the measurement is aborted with message on LCD.
Model CPCM-1 is a mains operated unit which includes the HV supply for detector, front end electronics and micro controller for all the operations. Setup mode allows user to set the counting time, alarm level (CPS) and background subtraction ON or OFF. While there is no palm under the detector, instrument measures the background level which is used for getting the net counts in CPS for alarm activation.
Model CPCM-1 is useful for detection of alpha contamination on palms. It is designed for ease of measurement to be used for health physics application in nuclear facilities like R&D labs, nuclear power plants etc.
Specifications: Model CPCM-1
Contamination detected
Alpha & Beta
Detector
LEFT & RIGHT Hands: Minimum Dimension of 120 mm (L) x 110 mm (W), ZnS(Ag) Scintillator Adhered to maximum 0.10" thick plastic scintillator mounted on minimum 70mm dia PMT with light guid
SS Mesh Arrangement
Removable Hexagonal SS mesh.
Display
Minimum 2 x 15 char. LCD for menu and other messages
Keypad
4 Keys to set the parameters
Palm Detection
Left: Automatic using one IR switch and one touch switch
Right: Automatic using one IR switch and one touch switch
Efficiency
Alpha: minimum 20% for Am241
Beta: minimum 10% for Sr90
HV supply
up to 1000 V internally pre-set
Counting Time
Settable from 1 to 900 seconds (minimum) or more.
Alarms
Green / Red bright LEDs with audio buzzer
Alarm Setting
Settable from up to 900 CPS (minimum)
Mechanical Enclosure
Powder coated Wall Mountable Steel housing
Dimensions: 220 W x 360 H x 260 D mm
Model CAM A/B is a Continuous Air Monitoring system with independent Alpha and Beta Channels. CAM A/ B is designed and manufactured indigenously by Para Electronics Mfg. Division of Electronic Enterprises (I) Pvt. Ltd. for Continuous Monitoring of Alpha and/or Beta activity in the surrounding atmosphere. 
Electronic Readout Unit uses 2 LED displays for CPM indication. 4 x 20 Character LCD is used for various menus, Bq/M3 and flow reading. 6 Keys pad enables user to set up the parameters and also calibrate the instrument for Flow and Activity measurement. 
2” dia ZnS(Ag) Scintillator based Alpha Detector is mounted on 2” dia PMT. Voltage Divider and Preamplifier are also housed in the detector assembly. This detector gives better than 25% efficiency.
Electronic Flow sensors are employed for measurement of air flow in LPM. The flow totalizer gives the integrated value of air volume that has passed through the filter paper in the given time. This gives accurate estimates of Bq/M3.
Two independent air sampling pumps with 117 LPM (free air) capacity are used for Alpha and Beta Channels. Use of separate pumps removes any interaction of air flow between Alpha and Beta channels.
Elegant yet simple, design of CAM enables user to change the filter paper(s) without disturbing the detector mounting arrangement. Air Sampling Pumps are rated for continuous operation. Rotameter flow measurement is also possible as an alternative to electronic flow measurement. 
Model ALCAM provides inlet connection for connecting the air suction vacuum line. However, air sampling pump unit also can be supplied as an optional accessory. It is expected that the flow range should be between 40 to 70 LPM. Rotary vanes based dry pump with open air suction capacity up to 125 LPM is supplied for 24 hours nonstop operation as an optional accessory.
Wall mountable Continuous Air Monitoring System model ALCAM is supplied in rack. This rack (depth 23 cms) contains the 2” dia ZnS(Ag) Alpha detector on 2” dia PMT, Filter holder assembly, air flow measuring unit and electronic unit for display of Alpha activity. 
Information acquired by camera and detectors is communicated to PC, connected through ethernet cable. This information is permanently stored in PC memory for viewing later. Software written for this application allows user to see the alarm status, counts information and photo of the person at a remote location. Detector fail, high background, Count Rate alarm conditions are detected and indicated locally on tower lamp with audio alarm. User can carry out setup through PC software as well. This information is also displayed on PC, LCD as well as on the remote alarm indication and display box supplied as an option.
The detector is mounted upside down so that the palm can be held below the SS mesh, thereby reducing the chances of alpha particles falling on active area of the detector. One IR sensor and other touch switch sensor detect the presence of palm automatically. This will automatically start the measurement for preset time. At the end of measurement, if the measured value is greater than the set alarm value, appropriate message, and audio, visual alarm indications are provided. Should the palm moves during the measurement time, the measurement is aborted with message on LCD.
Model APCM-2 is a mains operated unit which includes the HV supply for detector, front end electronics and micro controller for all the operations. Setup mode allows user to set the counting time, alarm level (CPS) and background subtraction ON or OFF. While there is no palm under the detector, instrument measures the background level which is used for getting the net counts in CPS for alarm activation.