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Title: Fast-Neutron Spectrometry Using a 3He Ionization Chamber and Digital Pulse Shape Analysis

Digital pulse shape analysis (dPSA) has been used with a Cuttler-Shalev type 3He proportional counter to measure the fast neutron spectra of bare 252Cf and 241AmBe neutron sources. Measurements have also been made to determine the attenuated fast neutron spectra of 252Cf shielded by several materials including water, graphite, liquid nitrogen, magnesium, and tungsten. Rise-time dPSA has been employed using the common rise-time approach for analyzing n +3He ? 1H + 3H ionization events and a new approach has been developed to improve the fidelity of these measurements. Simulations have been performed for the different experimental arrangements and are compared, demonstrating general agreement between the dPSA processed fast neutron spectra and predictions.
Authors:
; ;
Publication Date:
OSTI Identifier:
984555
Report Number(s):
INL/CON-10-18053
Journal ID: ISSN 0969-8043; TRN: US1005945
DOE Contract Number:
DE-AC07-05ID14517
Resource Type:
Conference
Resource Relation:
Journal Volume: 70; Journal Issue: 8; Conference: 2010 Symposium on Radiation Measurements and Applications,Ann Arbor, MI,05/24/2010,05/28/2010
Research Org:
Idaho National Laboratory (INL)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; FAST NEUTRONS; GRAPHITE; IONIZATION; IONIZATION CHAMBERS; MAGNESIUM; NEUTRON SOURCES; NITROGEN; PROPORTIONAL COUNTERS; PULSE RISE TIME; RADIATIONS; SHAPE; SPECTRA; SPECTROSCOPY; TUNGSTEN; WATER neutron spectrometry