Material Protection

Pedestrian Portal Monitor

• Design Criteria for SNM Portal Monitors
  - Maximize sensitivity for SNM
  - Minimize nuisance alarms
  - Special security features
• Features of SNM Portal Monitors
  - Intelligent portal controller provides automatic operation in a wait-in or pass-through mode
  - Sequential Probability Ratio Test (SPRT) instead of moving average or fixed ratemeter alarm points
  - Variance analyzer that operates continuously to analyze variations in the background
  - SCAs and an LLD instead of LLD only
  - Enhanced modular design eases serviceability
  - Low-noise electronics improves sensitivity and reduces nuisance alarms
  - Secured communication port for parameter setup and diagnostics via a terminal
  -

  Vehicle Portal Monitor

  Rugged, weather-tight, and tamper proof enclosures
• Types of SNM Monitors
  Gamma Portal Monitors
  - Pedestrian Portal Monitors (JPM-21A)
  - Vehicle Monitors (JPM-12A)
  Neutron Portal Monitors
  - Pedestrian Portal Monitors (JPM-41A)
  - Vehicle Monitors (JPM-31A)
  Combination
  - Neutron/Gamma (JPM-32A, JPM-42A)
  - Gamma/Metal Detector (JPM-22A)
  

Hand-Held Monitors

• JHH-31, 41, 50

  Small size - 9 x 13 x 20 cm (H x W x D)
• Light weight - 1.8 kg
• Microcomputer controlled
• LED gain stabilization
• Long battery life (greater than 16 hours per charge)
• Lower Level Discriminator (LLD) and three Single Channel Analyzers (SCAs)
• 4-digit LCD display
• Simple SCA adjustment using on-board display
• Crystal-controlled count interval
• Stabilized sodium iodide detector eliminates the need for recalibration with a reference spectrum before each verification
• JHH-31 Internal detector
• JHH-41, 50 External detectors

NaI Detector Shield/Collimators

• JSC-45, 46, and 47

  Lightweight
• Small size
• 2.5 x 1.3 cm thick NaI(Tl) detector, JSC-45
• 2.5 x 5.1 cm thick NaI(Tl) detector, JSC-46
• 5.1 x 1.3 cm thick NaI(Tl) detector, JSC-47
• High voltage/preamp PC board with LED stabilization circuitry located in the base of the shield
• 2.5 cm diameter collimator, JSC-45 and 46
• 5.1 cm diameter collimator, JSC-47
• Variable positions for detector with reference to the front face of the shield
• Composite shield to reduce low-energy x-ray background
• Optional carrying strap to allow more freedom of movement