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Neutron Detection Module for Portal Monitors



Downloads: Boron Coated Straw Portal Monitor 
brochure 



Portal

Features & Benefits: 

  • Transparent drop in replacement in most cases involving no complex pulse shape discrimination circuits as required for the 6Li systems
  • 10B is readily available through free commerce with no dependence on government sourcing
  • The highest gamma rejection in the industry
  • No response limitations on response as encountered with other commercial 10B systems
  • No scintillators or PMTs with known aging issues
  • Exceptionally low background
  • Attractive pricing

Specifications

NDM
  • Form Factor
    • 85"L x 12"W x 5"H
    • Other sizes available
  • Neutron Moderator
    • High-density polyethylene (HDPE)
    • 80.25"L x 11.50"W x 4.50"H
    • Up to 95 straw detector positions
  • Boron-coated straw detectors
    • 10B4C lined straw element hermetically sealed in ruggedized aluminum enclosure
    • Straw element diameters from 4.43 mm to 14.9 mm
    • Counting gas: Ar (90) / CO2 (10) @ 0.7 atmospheres
    • Bias voltage: 700-950 V
  • Electronics Interface
    • Analog and digital outputs
    • Incorporated HV supply


Performance:

  • Neutron Detection Efficiency
    • Moderated 252Cf source @ 2m = 3.55 cps/ng*
    • Unmoderated 252Cf source @ 2m = 3.13 cps/ng*
  • Gamma Ray Detection Efficiency
    • 60Co exposure rate of 20 mR/hr = 1.2 x 10-8*
    • 60Co exposure rate of 50 mR/hr = 1.4 x 10-8*
  • Background Rate
    • Background rate = 2.5 cps**
  • Environmental
    • Temperature: -40 °C to +50 °C
    • Relative Humidity: 98%

 

 

Other Configurations 

  • Physical Configuration
    • Sealed straws in various diameters
    • Portal lengths of 1 m or 2 m
  • Electronics Options
    • Drop-in option utilizing 3He pre-existing amplifier
    • Simple PTI amplifier with TTL output
    • Sophisticated digital board with multi-layer detection for energy discrimination.

 


 

 * Measurements were conducted at an outdoor location in Houston, TX. NDM installed inside NEMA box mounted in the steel stand which is part of the standard RPM installation used for all commercial systems. The NDM center was positioned 1.16m above the ground.

** Sea level, Houston, TX


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