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Title: New organic crystals for pulse shape discrimination

Efficient, readily-available, low-cost, high-energy neutron detectors can play a central role in detecting illicit nuclear weapons since neutrons are a strong indication for the presence of fissile material such as Plutonium and Highly-Enriched Uranium. The main challenge in detecting fast neutrons consists in the discrimination of the signal from the gamma radiation background. At present, the only well-investigated organic crystal scintillator for fast neutron detection, in a n/{gamma} mixed field, is stilbene, which while offering good pulse shape discrimination, is not widely used because of its limited availability and high cost. In this work we report the results of our studies made with a number of new organic crystals, which exhibit pulse shape discrimination for detection of fast neutrons. In particular 1,1,4,4-tetraphenyl-1,3-butadiene features a light yield higher than anthracene and a Figure of Merit (FOM) for the pulse shape discrimination better than stilbene. New crystals are good candidates for the low-cost solution growth method, thus representing promising organic scintillators for widespread deployment for high-energy neutron detection.
Authors:
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Publication Date:
OSTI Identifier:
965950
Report Number(s):
LLNL-JRNL-411978
Journal ID: ISSN 0018-9499; IETNAE; TRN: US0903999
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Journal Article
Resource Relation:
Journal Name: IEEE Transactions on Nuclear Sciene, vol. 56, no. 3, January 6, 2009, pp. 899-903; Journal Volume: 56; Journal Issue: 3
Research Org:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUMM MECHANICS, GENERAL PHYSICS; ANTHRACENE; DETECTION; FAST NEUTRONS; FISSILE MATERIALS; GAMMA RADIATION; NEUTRON DETECTION; NEUTRON DETECTORS; NEUTRONS; NUCLEAR WEAPONS; PHOSPHORS; PLUTONIUM; SHAPE; STILBENE; URANIUM