Special Projects

Model PCR-1 has two response time constants, 1 second or 5 seconds. Response time is switch selectable.

Model PCR-1 is housed in robustly constructed mechanical enclosure to provide immunity against mechanical shocks and water spillage. Critical controls are mounted inside the unit to protect it against unauthorized tampering.

Instrumentation
Count Rate Meter	:	0 to 10³, 5x 10³, 10⁴, 5x10⁴, 10⁵, 5x10⁵, 10⁶ CPM Selected by front panel ‘RANGE' switch
Response Time	:	1 and 5 Sec. Selected by front panel toggle Switch
Accuracy	:	+/- 5% of Full Scale
CRM Display	:	Taut Band 120 mm X 60 mm rectangular panel meter, 120 deg FS movement. (Meter accuracy 1% of Full Scale)
High Voltage	:	0 to + 1500 Volts at 0.1 mA adjustable by internally mounted 10 turn helipot with graduated dial
Chirper Output	:	1 piezoelectric buzzer inside front panel
LLD Level	:	0 to 5 V settable by internally mounted helipot with graduated Dial
ULD Level	:	0 to 5 V settable by internally mounted helipot with graduated Dial

General
Mechanical	:	255 W X 175 H X 175 D mm
Electrical	:	12 V DC battery (Dura Cell type preferred)
Weight	:	1Approximately 2 Kg

6 Channel Dose Rate Meter / Averager system was designed, fabricated for AFFF unit of BARC at Tarapur. This system uses 6 nos of thin walled GM tubes housed in a stainless steel Detector Head.

This system is useful for gross counting applications with the radioactive sample located inside the well surrounded by the GM tubes. The GM tubes are powered by 6 independent HV supplies which can be set to any desired value. Output HV is also displayed on the Digital Indicator.

The Dose Rates as outputs are indicated on Digital Readout with 0 to 0.2 mR/Hr, 0 to 2.0 mR/Hr and 0 to 20 mR/Hr. These outputs are fed to the Averager which also has similar Digital Readout and ranges. The back off or Tare adjust is provided for the Averager which enables user to cancel
the background. 4 nos of Dose Rate Meters are housed in one enclosure. The other enclosure houses the remaining two Dose Rate Meters & the Averager unit.

Detector Head
Detector	:	6 Nos NRC GM Tubes type 2216 mounted in a 2pi geometry
Detector size	:	200 mm long x 20 mm dia. GM tube
Well Size	:	1 Inch dia through hole Well Material : Acrylic
Detector Head Housing	:	Stainless Steel
Detector Head Output	:	6 BNC connector ports for GM Tube HV connections
Dose Rate Meters
Number of Channels	:	6
High Voltage output	:	6 independent supplies adjustable from 0 to 1000 V
H.V. Indication	:	Digital Readout
Dose Rate Ranges	:	0 to 0.2 mR/Hr, 0 to 2.0 mR/Hr, 0 to 20 mR/Hr
Dose Rate Output	:	0 to 2 Volts F.S. for each range
Averager
Number of Channels	:	6
Dose Rate Ranges	:	0 to 0.2 mR/Hr, 0 to 2.0 mR/Hr, 0 to 20 mR/Hr
Tare Adjust	:	0 to 100 % for each range
Detector
GM tube	:	Halogen quenched, Thin walled
Energy Range	:	100 KeV to 2 MeV
General
Mechanical	:	2 nos of Aluminum enclosures with dimensions 300 L x 127 H x 200 D.
Weight	:	Approx. 5 Kg each
Electrical	:	240 V (± 10 %) AC, 50 Hz
HV Supply
Output	:	+50 to +1000V adjustable @ 1 mA max
Data Acquisition & Control	:	Windows based package for data acquisition, data logging & parameter set up
Options
RS-HHT	:	Modification to RS-232 port for connecting hand held terminal
HHT-1	:	Hand Held Terminal
PRG-HV	:	Remotely settable and readable HV
RTC	:	Real time battery backed clock for date and time display and readout
AR/IT	:	Automatic selection of range and integration time
LOGO/P	:	Logarithmic 4 to 20 mA output
3ECAL	:	Calibration at 3 energies
EXM	:	External mounting of GM tube, 10-metre cable.

NETS-1 A PC based Whole Body Gamma Radioactivity Measurement System for Animal Studies has been assembled and supplied to Radiation Medicine Center, at Parel, Mumbai. This system is ideally suited for high energy gamma radioactivity measurements in rodents, rabbits and other laboratory animals, for research in Cancer. Animal housing/counting zone is provided in a well shielded Lead Castle. The system consists of 5"x 3" NaI(Tl) detector, lead shield, plug-on Multi Channel Analyser and PC interface for control & relevant energy/spectrum analysis software package.

Para Electronics has designed, fabricated & supplied 3 GM tubes based Beta Counting System. This system consists of special GM tubes housed in a Acrylic Block, Pulse Shaping Electronics, Common High Voltage Supply for GM tubes , 4 Digit Preset Timer and 8 digit Scaler with display. The technical specifications were provided by the customer and Para Electronics designed and supplied the system. The customer- Nuclear Physics Department of Mangalore University is using the system to monitor Neutron Radiation from the Accelerator supplied by Center for Advance Technology (CAT), Indore.

This system works on Neutron Activation technique. The incident neutrons are moderated through the 25 mm thick walls of the acrylic housing. The thin silver wall of the GM tube gets activated by the neutrons and emits Beta radiations after some time delay. The pulse output from each GM tube is processed to convert it in a TTL pulse. The TTL pulses from all 3 GM tube channels is OR-tied for counting. Hence scaler counts are the sum of all the counts from 3 GM tubes. This beta radiation is counted for a preset time. The GM Tube Assembly is kept in the Accelerator room while the Counting Unit is 10 metres away.

The system has following subsystems :

A) Thin Wall Beta-Gamma GM Tubes (3 Nos) Type 75527
B) Acrylic Housing for GM tubes The 3 GM tubes are housed in Acrylic Block with overall dimensions of 160 mm L x 70 mm W x 175 mm D. The GM tubes are be placed in such a way that there will be atleast 25 mm acrylic all around each GM tube. The GM tubes are connected to 3 BNC female connectors mounted on the side of the Acrylic Block.
C) 3 Channel GM Counting System
High Voltage Supply
Output Voltage	:	0 to +1000 Volts at 1mAmp Max.
Output Control	:	10 turn potentiometer for adjustment from 0 to 1500 Volts, graduated dial with resolution within 5%
Output Connectors	:	20 mVolts (RMS)
Ripple	:	3 BNC Female connectors internally connected through load resistor of 1M Ohm
Pulse Shaping Electronics
Number of Inputs	:	3
The shaped pulses from individual GM tubes are converted into TTL pulses. These TTL pulses will be OR ed to get common output which will be the input for the common scaler.
Scaler and Timer with Display
Scaler
Capacity	:	99,999,999 Counts
Count Rate	:	2 MHz Max
Display		8 Decade, 7 Segment LED display
Input	:	Internally connected to common TTL Output
Timer
Preset Time	:	1 to 9999 seconds settable with Thumb wheel switches
Display	:	4 Decade, 7 Segment LED display
General
Mechanical	:	380 L x 160 H x 220 D mm
Weight	:	Approx. 5 Kg each
Power	:	240V (+/-10 V), 50 Hz AC Mains

In counting experiments, to shield the detectors from background/ambient radiations, lead shields with/without tin, copper or aluminum lining are used.

Para Electronics has developed and supplied customer specific lead shield assemblies for Scintillation and other types of detectors. Shields for detector diameter 25 to 125 mm have been made with shield height ranging from 200 to 800 mm. Interleaved sections facilitate easy assembly at site.

				Counting System
Para Electronics also offers customised systems / products :				Radiation Monitor
Count Rate Meter \| 6 Channel Dose Rate Meter \| Whole Body Measurement \|				NIM Modules
3 GM Tube Based Beta Counting System \| Lead Shields for Detectors				Spectroscopy
				Data Acquisition
				Special Projects