TSA Systems' PM-700AG and PM-700AGN are stand alone pedestrian radiation portal monitors with excellent sensitivity and reliability

The PM-700AG'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 (special nuclear materials).

All of the essential components are contained in the pillars: radiation monitors / detectors, controller, occupancy detector. The system operates from an internal battery which 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 12 hours.

The PM-700AGN adds neutron detection capability to the basic PM-700AG. Both models are equipped with RS-232 and Ethernet communications capability.

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 count. The process normally 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 with 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 radiation portal 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, an storage sites where protection of SNM is essential.

The PM-700AGN's neutron monitoring adds the capability of detecting shielded neutron emitters.

Both models are highly sensitive and offer reliable operation in variable background environments. These systems cover most pedestrian monitoring applications.

Sensitivity

PM-700AG: Will detect 3 g ²³⁵U (HEU) or 0.08 g ²³⁹Pu when tested in accordance with ASTM Standard C 1169 for Category III*

PM-700AGN: Will detect 10 g ²³⁵U (HEU) or 0.30 g ²³⁹Pu when tested in accordance with ASTM Standard C 1169 for Category II* monitors; will detect 120 g of 99% shielded ²³⁹Pu based solely on neutron detection.

Detectors

PM-700AG: Two 36" H x 10" W x 1.5" D (91 x 25 x 4 cm) organic plastic scintillator detectors per pillar; provides approximately 2,160 in³ (35.4 ltrs) of detector volume per system.

The scintillator detectors are shielded on four sides with 0.375" (10 mm) of lead.

PM-700AGN: Two 30"h x 6"w x 1.5"d (76 x 15 x 4cm) organic plastic scintillator detectors and two 2" diameter x 36" (5 x 91cm) ³He neutron detectors per pillar; provides approximately 1,080 in³ (17.7 ltrs) of detector volume per system.

The scintillator detectors are shielded on four sides with 0.375" (10 mm) of lead.

Alarm Level: SPRT for neutron, N* sigma for gamma, entered from the numeric keypad.

False Alarm Rates : Typically less than 1 in 1,000 passages, as tested in accordance with ASTM Standard C 1169*

Alarm Indication: Red Strobe = Gamma Alarm. Amber Light = High / low faults. Blue Strobe = Neutron Alarm. Audio alarm is also triggered for gamma and neutron alarm conditions.

Display: Alphanumeric LCD, 4 lines x 16 characters.

Data Storage: 256 kb Flash Memory (adequate to store data for at least 2 months of operation).

Power Requirements: 90 - 250 Vac, 47 - 63 Hz, less than 100 VA. (Battery life greater than 12 hours normal operation).

Dimensions

PM-700AG: 84" H x 22" W x 8" D (213 x 56 x 20 cm) per pillar.

PM-700AGN: 84" H x 26" W x 8" D (213 x 66 x 20 cm) per pillar.

Weight

PM-700AG: ~400 lb (181 kg) per pillar.

PM-700AGN: ~600 lb (272 kg) per pillar.

Environmental: -30° to 122°F (-34° to 50°C) designed for use in a sheltered area.

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