TSA VM 250

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The TSA VM250 is a vehicle portal monitor which automatically screens vehicular traffic without the need for frequent calibration. The reliable and high sensitivity VM250 can be installed for use at uranium enrichment plants, weapons manufacturing and storage plants, nuclear laboratories, and nuclear waste disposal and storage sites where detection of Special Nuclear Materials (SNM) is essential. The VM250 is designed for use in harsh environmental conditions.

Advanced Design Features

The VM250 consists of two self-contained, weather resistant pillars placed on either side of the roadway to be monitored. The pillars are usually bolted to a concrete footing, with the interconnecting conduits installed under the roadway. Each pillar contains two plastic scintillator detectors, an occupancy detector and an amplifier. The master pillar also houses a battery, power supply, battery charger, and a system controller.

Programmable Detection Parameters

Selectable settings for sensitivity, energy discrimination, and fault levels may be entered by the administrator.


When the system is powered up, it takes 120 seconds to acquire an initial background. The background is continually updated until the system is occupied. When the infra-red detectors 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.

Flexible Detection Options

The TSA VM250 is available with a third overhead pillar for higher sensitivity. The VM250 is available in three configurations; Gamma, Neutron or a combination of Gamma and Neutron detection. Gamma provides detection of ionizing radiation and Neutron provides detection of Special Nuclear Materials (SNM) while the combined Gamma and Neutron provides the most powerful detection capabilities for radioactive isotopes even in shielded materials.

Interface Options

With the optional Remote Alarm Panel operators can view alarms up to 300m from the monitor. The TSA VM250 is compatible with TSA RAVEN™ communications software designed to both capture and view data and video images relating to a radiological detection incident.

Standard Features

  • Programmable Detection Parameters
  • Audio and Visual Indicators
  • Relay Outputs for User Interface
  • Universal Power Supply
  • Ethernet Connectivity
  • Battery Backup
  • Controller Mounting Options
  • NEMA 4 Rated Enclosure
  • IP 66 Rated Enclosure
  • TSA RAVEN™ Compatible


  • Gamma: (H x W x D): 244 or 305 x 25 x 25 cm (120” x 10” x 10”) per pillar
  • Gamma and Neutron : (H x W x D): 244 or 305 x 66 x 20 cm (120” x 26” x 8”) per pillar


  • Gamma: Approximately 136kg (300lbs) per pillar
  • Gamma and Neutron: Approximately 273kg (600 lbs) per pillar