TSA's PM-700A and PM-700AGN monitors are stand-alone, pedestrian portal monitors with excellent sensitivity and reliability. The PM-700A's large detectors and unique detection algorithm improve its performance to the point that it can achieve ASTM Standard C 1169 Category III* sensitivity for SNM.
All of the essential components are contained in the pillars; radiation detectors, controllers, and occupancy detector. The systems operate from an internal battery. The battery is constantly charged from the site's ac line during normal operation. In the event of a power outage, the battery permits continued operation for at least 24 hours.
Model PM-700AGN adds neutron detection capability to the basic PM-700A. Both models are equipped with RS-232 and Ethernet communications capability.
The PM-700A and PM-700AGN systems utilize TSA's model SC-770 controller in the master pillar, and model SCA-775 single channel analyzer in the slave pillar. TSA's AM-270 provides audible and visual alarm indications.
OPERATION: After the initial site preparation is completed, the systems can be installed and operating in less than an hour. When the system is powered up, it acquires an initial background. The process takes twenty seconds. The background is continually updated until the system is occupied.
When the infra-red detector senses occupancy, the system starts comparing the current count to the most recent background data. Alarm comparisons are made every 200ms. If the count exceeds the alarm level, both audible and visual alarms will be triggered. The system monitors itself and indicates low and high background conditions. A closed circuit tamper output is available for connection to the AM-270 or site security system. System status is continuously updated on the SC-770 display.
These monitors are designed to automatically scan pedestrian traffic without the need for frequent calibration. They are intended for applications where the relatively low energy emissions from 235U and 239Pu are the main concern. They are currently in use at uranium enrichment plants, weapons manufacturing plants, weapons storage sites, nuclear laboratories, nuclear waste disposal, and storage sites where protection of SNM is essential.
Neutron monitoring adds the capability of detecting shielded neutron emitters.
Both models share TSA's unique design features of high sensitivity and reliable operation in variable background environments. These systems cover most pedestrian monitoring applications. TSA's expert engineering staff can adapt them to meet special requirements, if necessary.
Specifications
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SENSITIVITY:
PM-700A:
Will detect 3g HEU or 0.08g 239Pu when tested in accordance with ASTM Standard C 1169 for Category III* monitors
PM-700AGN:
Will detect 10g HEU or 1g 239Pu when tested in aaccordance with ASTM Standard C 1169 for Catagory II* monitors; will detect 120g of 99% shielded 239Pu based solely on neutron detection
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DETECTORS:
PM-700A:
Two, 36"h x 10"w x 1.5"d (90 x 25 x 3.8cm) organic plastic scintillator detectors per pillar; provides approximately 2,080 in3 (35.4 liters) of detector volume per system
The detectors are shielded on five sides with 0.375" (10mm) of lead
PM-700AGN:
Two, 30"h x 6"w x 1.5"d (75 x 15 x 3.8cm) organic plastic scintillator detectors and two 2" diameter x 36" (5 x 91cm) 3He neutron detectors per pillar
The detectors are shielded on five sides with 0.375" (10mm) of lead
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ALARM LEVEL:
SPRT for neutron, N*sigma for gamma, entered from the numeric keypad
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FALSE ALARM RATES:
Typically less than 1 in 1,000 passages, as tested in accordance with ASTM Standard C 1169*
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ALARM INDICATION:
Gamma alarms are indicated by a red strobe light mounted on the master pillar. High and low faults along with other fault conditions are indicated by an amber light. Neutron alarm is indicated by a blue strobe light.
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DISPLAY:
Alphanumeric LCD, 4 lines x 16 characters
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COMMUNICATIONS:
Both models are equipped with RS-232 and Ethernet communications capability
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DATA STORAGE:
256k bytes of flash memory is used to store average hourly background data and alarm data. Under normal conditions the memory should be adequate to store data for at least 3 months of operation.
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POWER REQUIREMENTS:
90 - 250 Vac, 47 - 63 Hz, less than 100 VA
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BATTERY LIFE:
Greater than 24 hours normal operation
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DIMENSIONS:
PM-700A:
84"h x 22"w x 8"d (214 x 56 x 20cm)
PM-700AGN:
84"h x 26"w x 8"d (214 x 66 x 20cm)
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WEIGHT:
PM-700A:
~400 lb (182kg) per pillar
PM-700AGN:
~600 lb (273kg) per pillar
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ENVIRONMENTAL:
-30 to 122°F (-34 to 50°C); designed for use in a sheltered area
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OPTIONAL COMPONENTS:
Heaters, AM-270
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