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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

CRAIG MILLS:
Email id: cmills@apantec.com
Tel No.:267-436-4034
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Providing Innovative Engineering Solutions for Radiation MonitoringProviding Innovative Engineering Solutions for Radiation Monitoring Providing Innovative Engineering Solutions for Radiation Monitoring
Mobile All-Terrain Radiological Surveyor [MARS]
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Continuous Air Monitor - Fixed Filter Particulate, Iodine & Noble Gas
SELF-CONTAINED
PASSIVE SAMPLE COLLECTOR
Accident Range Noble Gas Monitor

The AM3F is a continuous air monitoring system designed to measure the particulate, iodine and noble gas activity in a sample airstream. The AM3F uses three separate measuring channels arranged in series to perform the measurement. A common vacuum pumping system is used for transport of the 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 fixed filter sampler providing collection of airborne on industry standard 47mm diameter filter paper. The filter paper deposition is designed to provide an even distribution and positions the active end of the detector in close proximity to the filter media for maximum sensitivity. The particulate channel will be equipped with a beta sensitive plastic scintillation detector (model SD201P) for detection of beta emitting particles. The detector interfaces with a locally mounted spectrum analyzer (model SDA3E) which provides the low voltage power to the detector, interfaces the detector/SCA with the ratemeter, and provides an automatic gain control function. The SDA3E unit communicates with the skid-mounted 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 is similar to the particulate channel and also uses a 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 spectral information to an external SDA3E analyzer unit. 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 SD201P beta scintillation detector is located with the sensitive volume for measurement of noble gas activity.

The detector detects the nuclear pulses, provides biasing voltage, and transmits the count rate information to the locally mounted SDA3E analyzer. 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
Lower Limit of Detection: 1E-11 uCi/cc
Dynamic Range: 1E-11 uCi/cc to 1E-5 uCi/cc Referenced to Cs-137
Iodine Monitors:
Lower Limit of Detection: 1E-11 uCi/cc
Dynamic Range: 1E-11 uCi/cc to 1E-5 uCi/cc Referenced to Cs-131
Noble Gas Activity
Lower Limit of Detection: 1E-7 uCi/cc
Dynamic Range: 1E-7 uCi/cc to 1E-1 uCi/cc Referenced to Xe-133
Component Specifications
SD201P
Detector: NE102 beta plastic scintillator
Dynamic Range: 1E+0 to 1E+7 CPM
Detector Output:

10 uR/h to 1,000 R/h.

Detector Accuracy: 15% of true field intensity.
Detector Linearity ±5%.
Operating Voltage: 500 to 1500 V.NOMINAL LED BKGND: 1015 CPM.
Operating Humidity: up to 95% non-condensing.
Housing: Moisture Proof Stainless Steel.
Weight: 2.7 kg (5 lb).
SD220N
Detector: NAI 2 x 2 Gamma Scintillation
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
Operating Humidity: 12 VDC, 1A nominal, (9 VDC to 15 VDC)
(optional 110/220 VAC 50/60
Hz converter)
BKGND: 10–15 CPM.
Operating Humidity: up to 95% non-condensing.
Housing: Moisture Proof Stainless Steel.
Weight: 2.7 kg (5 lb).
RM1R Series Display and Control Unit
Processor: NAI 2 x 2 Gamma Scintillation
I/O Processor: 1E+0 to 1E+7 CPM
DISPLAY:

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
OUTPUTS:
Digital: (3) RS485
  (1) TCP/IP Ethernet

Analog: (4) 0-10VDC, or
  (4) 4-20 mADC isolated Six DPDT relays for FAIL, ALERT,HIGH other alarms Relay contact rating 5A @ 115VAC resistive

Power:

90-260VAC, single phase, 47-63 Hz, 15 watts

TEMPERATURE: -10°C to + 50°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.
Bits per channel: 32
Output Signal: Positive pulses, 0.5 usec wide Capable of driving 500 ft of cable
Energy Nonlinearity: +/-1% of full scale
Window Width Accuracy: +/-0.5% of energy setting
LED Test Signal
Equivalent Energy: 3 MeV
Background Rate: 10 to 15 CPM
Environmental
Temperature: 0 to 50 °C
Dimensions: 6.25 W x 7.5 H x 5.03 D
Weight: 2 lbs. nominal

The AM3F 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 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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