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North Penn Business Park,
4500 North Cannon Ave. Lansdale, PA
19446, USA
Tel No.: (267) 436-3991
Fax: (215) 362-5343

Email id: cmills@apantec.com
Tel No.:267-436-4034
Thursday, September 18, 2014
Friday, July 18, 2014
JNL Area Monitor Channels
Providing Innovative Engineering Solutions for Radiation MonitoringProviding Innovative Engineering Solutions for Radiation Monitoring Providing Innovative Engineering Solutions for Radiation Monitoring
Continuous Air Monitors
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AM3M Continuous Air Monitor –Moving Tape Particulate, Iodine & Noble Gas
AM3M Continuous Air Monitor –Moving Tape Particulate, Iodine & Noble Gas

The AM3M is a continuous air monitoring system designed to measure the particulate, iodine and noble gas activity in a sample air stream. The font class="thead"> AM3M uses three separate measuring channels arranged in series to perform the measurement. A common vacuum pumping system is used to transport sample gases through the system. Local RM1R display and control units are included for system operation, data concentration and communication. The particulate channel uses a lead shielded moving filter that provides collection of airborne particles using a continuous spool of filter paper. The filter paper deposition provides an even distribution and includes the capability of adjusting the filter paper speed to accommodate applications that deposit higher activities, such as post-accident monitoring and analysis. The particulate channel is equipped with a beta sensitive plastic scintillation detector (model SD201PB) for detection of beta emitting particles. The detector interfaces with a locally mounted spectrum analyzer (model SDA3E) that provides biasing voltage to the detector, analyzes the nuclear pulses for counting, and provides an automatic gain control function. The SDA3E unit communicates with the display and control unit (model RM1R) using Ethernet (TCP/IP), RS232 or RS485 communications for display of the measured activity and for alarm determination.

The exhaust from the particulate channel is plumbed to the inlet of the iodine monitoring channel. The iodine monitoring channel uses a fixed filter lead shielded sampler for collection of the iodine activity. In the iodine channel, a TEDA activated charcoal cartridge or silver zeolite cartridge replaces the particulate fixed filter media. A gamma sensitive scintillation detector (model SD220N) is placed within the lead shielded sampler with the sensitive end exposed to the collection cartridge. The SD220N detects the gamma events and provides the nuclear pulses to an external pulse analyzer unit for pulse analysis and transfer data to the RM1R. The sample
gases, with particulate and iodine activity removed, enter the noble gas sampler for measurement. The noble gas sampler (model GS54) is a lead shielded sampler enclosing a sensitive volume. A SD220N gamma scintillation detector or SD201PB beta scintillation detector is located with the sensitive volume for measurement of noble gas activity. Again, the detector detects the nuclear events, pulses, biasing voltage, and performs gain stabilization. The noble gas sampler includes a vacuum transducer to
automatically correct the measured activity to standard pressure. The vacuum pumping system uses a positive displacement carbon vane pump for transport of sample gases through the monitoring system. A mass flow meter and proportional control
valve allows the sample flow rate to be either manual set to the desired flow or to match the sample flow rate to a stack or vent velocity for representative sampling. The flow rate is provided to the local RM1R electronics for determination of total release and for calculation of concentrations. Alarms are included for annunciation of a low flow condition.

Particulate Activity (Referenced to Cs-137)
Lower Limit of Detection: 1E-11 uCi/cc
Dynamic Range: 1E-11 uCi/cc to1E-5 uCi/cc
Iodine Activity (Referenced to I-131)
Lower Limit of Detection: 1E-11 uCi/cc
Dynamic Range: 1E-11 uCi/cc to 1E-5 uCi/cc
Noble Gas Activity (Referenced to Xe-133)
Lower Limit of Detection: 1E-7 uCi/cc
Dynamic Range: 1E-7 uCi/cc to 1E-1 uCi/cc
Detector: NE102 beta plastic scintillator
Dynamic Range: 1E+0 to 1E+7 CPM
Detector Output: Negative Pulse.
Detector Accuracy: ±15% of true field intensity.
Detector Linearity ±5%.
Operating Voltage: 500 to 1500 V.NOMINAL LED BKGND: 10–15 CPM.
Operating Humidity: Up to 95% non-condensing
Housing: Moisture Proof Stainless Steel.
Weight: 2.7 kg (5 lb).
Processor: 32-Bit high performance133Mhz integrated microcontroller designed for real-time and PC/AT compatible embedded applications. Robust automotive grade technology with watchdog timer.
I/O Processor: Dedicated / High Performance I/O Co-Processing via FPGA / 100 Mhz

LCD with backlight Available 2 x 20 character vacuum fluorescent Analog/Digital Auto ranging and Auto zeroing

Alarm/Status Indicators:
Red indicator: HIGH
Amber indicator: ALERT
White indicator: FAIL
Green indicator: NORMAL
Digital: (3) RS485
  (1) TCP/IP

Ethernet: (1) US Analog , (4) 0-10VDC, or (4) 4-20 mADC isolated

Relays: Six DPDT relay contact for FAIL,
  ALERT, HIGH and MISC alarms
  Relay contact rating 5A @
  115VAC resistive
Power: 90-260VAC, single phase, 47 to 63 Hz, 15 watts

-100 to +500 C

Humidity: up to 95% RH, non-condensing
SDA3E Analyzer
Power Requirements
Power requirements: max. 250 mA, +/-15 VDC
SCA parameters
Energy Range: 100 keV to 2.55 MeV variable In steps of 10 keV from keypad
Energy Sensitivity: 100 mV to 2.55 V approx. corresponding to energy range.
Mode: Integral or Differential
Window Width: +/- 1% to +/- 90% around center Energy.
Output Signal: Positive pulses, 0.5 usec wide Capable of driving 500 ft of cable
Energy Nonlinearity: +/-1% of full scale
Window Width
+/-0.5% of energy setting
LED Test Signal
Equivalent Energy: 3 MeV
Background Rate: 10 to 15 CPM
Temperature: 0 to 50 °C
Dimensions: 6.25” W x 7.5” H x 5.03” D
Weight: 2 lbs. nominal
The AM3M is provided fully wired and plumbed on an open frame skid for ease of maintenance. A power distribution enclosure is provided which distributes the required
operating voltages to the system’s electrical components. In addition, the power distribution box provides an instrument ground function as well as providing circuit
breaker protection for the system.
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