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Title: A technique for verifying the input response function of neutron time-of-flight scintillation detectors using cosmic rays

An accurate interpretation of DD or DT fusion neutron time-of-flight (nTOF) signals from current mode detectors employed at the Z-facility at Sandia National Laboratories requires that the instrument response functions (IRF’s) be deconvolved from the measured nTOF signals. A calibration facility that produces detectable sub-ns radiation pulses is typically used to measure the IRF of such detectors. This work, however, reports on a simple method that utilizes cosmic radiation to measure the IRF of nTOF detectors, operated in pulse-counting mode. The characterizing metrics reported here are the throughput delay and full-width-at-half-maximum. This simple approach yields consistent IRF results with the same detectors calibrated in 2007 at a LINAC bremsstrahlung accelerator (Idaho State University). In particular, the IRF metrics from these two approaches and their dependence on the photomultipliers bias agree to within a few per cent. This information may thus be used to verify if the IRF for a given nTOF detector employed at Z has changed since its original current-mode calibration and warrants re-measurement.
Authors:
; ; ;  [1] ; ; ; ; ;  [2]
  1. Department of Chemical and Nuclear Engineering, University of New Mexico, Albuquerque, New Mexico 87131 (United States)
  2. Sandia National Laboratories, Diagnostics and Target Physics, Albuquerque, New Mexico 87111 (United States)
Publication Date:
OSTI Identifier:
22303467
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 11; 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; BREMSSTRAHLUNG; CALIBRATION; COSMIC RADIATION; COUNTING RATES; LINEAR ACCELERATORS; NEUTRON DETECTORS; PHOTOMULTIPLIERS; PULSES; RESPONSE FUNCTIONS; SANDIA NATIONAL LABORATORIES; SCINTILLATION COUNTERS; TIME-OF-FLIGHT METHOD