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Title: Fission signal detection using helium-4 gas fast neutron scintillation detectors

We demonstrate the unambiguous detection of the fission neutron signal produced in natural uranium during active neutron interrogation using a deuterium-deuterium fusion neutron generator and a high pressure {sup 4}He gas fast neutron scintillation detector. The energy deposition by individual neutrons is quantified, and energy discrimination is used to differentiate the induced fission neutrons from the mono-energetic interrogation neutrons. The detector can discriminate between different incident neutron energies using pulse height discrimination of the slow scintillation component of the elastic scattering interaction between a neutron and the {sup 4}He atom. Energy histograms resulting from this data show the buildup of a detected fission neutron signal at higher energies. The detector is shown here to detect a unique fission neutron signal from a natural uranium sample during active interrogation with a (d, d) neutron generator. This signal path has a direct application to the detection of shielded nuclear material in cargo and air containers. It allows for continuous interrogation and detection while greatly minimizing the potential for false alarms.
Authors:
; ;  [1] ;  [2]
  1. Nuclear Engineering Program, University of Florida, Gainesville, Florida 32611 (United States)
  2. Arktis Radiation Detectors Ltd., 8045 Zurich (Switzerland)
Publication Date:
OSTI Identifier:
22303972
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 1; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ATOMS; DETECTION; DEUTERIUM; ELASTIC SCATTERING; ENERGY ABSORPTION; ENERGY LOSSES; FAST NEUTRONS; FISSION NEUTRONS; HELIUM 4; INTERACTIONS; NATURAL URANIUM; NEUTRON GENERATORS; PRESSURE RANGE MEGA PA 10-100; PROLIFERATION; PULSES; RADIATION DETECTION; SCINTILLATION COUNTERS; SCINTILLATIONS