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Title: Development of a lithium fluoride zinc sulfide based neutron multiplicity counter

Abstract

Past 3He shortages led to investigations into replacement options for neutron detectors in systems that previously used 3He-based technologies. The goal of this research was to investigate the feasibility of a full-scale lithium fluoride with silver activated zinc sulfide (LiF/ZnS) based neutron multiplicity counter. The LiF/ZnS based neutron multiplicity counter (LiNMC) was developed based on an iterative process between modeling and experimental measurements. Each active region of the LiNMC contains five sheets of LiF/ZnS sandwiched between six sheets of wavelength shifting plastic to form neutron detection stacks. The wavelength shifted scintillation light was collected by photomultiplier tubes located on each end of the stacks. Twelve such detector stacks were placed around a sample chamber in a square arrangement with lithiated high density polyethylene blocks in the corners to reflect high energy neutrons and capture low energy neutrons. Preliminary calibration with a 252Cf neutron source showed that the LiNMC was able to achieve 36% neutron detection efficiency (ε) and an 11.7 μs neutron die-away time (τ) for a doubles Figure-of-merit (ε2/ τ) of 109. This is the highest doubles Figure-of-merit performance measured to-date for a 3He-free neutron multiplicity counter system. By the end of this project, the LiNMC’s basic components weremore » integrated into a single laboratory scale system capable of proof-of-concept measurements.« less

Authors:
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Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1422271
Report Number(s):
PNNL-SA-123198
Journal ID: ISSN 0168-9002; DN2001000
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment; Journal Volume: 887; Journal Issue: C
Country of Publication:
United States
Language:
English
Subject:
LiF/ZnS; neutron multiplicity counter; neutron coincidence counter; 3He-free

Citation Formats

Cowles, Christian, Behling, Spencer, Baldez, Phoenix, Folsom, Micah, Kouzes, Richard, Kukharev, Vladislav, Lintereur, Azaree, Robinson, Sean, Siciliano, Edward, Stave, Sean, and Valdez, Patrick. Development of a lithium fluoride zinc sulfide based neutron multiplicity counter. United States: N. p., 2018. Web. doi:10.1016/j.nima.2018.01.015.
Cowles, Christian, Behling, Spencer, Baldez, Phoenix, Folsom, Micah, Kouzes, Richard, Kukharev, Vladislav, Lintereur, Azaree, Robinson, Sean, Siciliano, Edward, Stave, Sean, & Valdez, Patrick. Development of a lithium fluoride zinc sulfide based neutron multiplicity counter. United States. doi:10.1016/j.nima.2018.01.015.
Cowles, Christian, Behling, Spencer, Baldez, Phoenix, Folsom, Micah, Kouzes, Richard, Kukharev, Vladislav, Lintereur, Azaree, Robinson, Sean, Siciliano, Edward, Stave, Sean, and Valdez, Patrick. Sun . "Development of a lithium fluoride zinc sulfide based neutron multiplicity counter". United States. doi:10.1016/j.nima.2018.01.015.
@article{osti_1422271,
title = {Development of a lithium fluoride zinc sulfide based neutron multiplicity counter},
author = {Cowles, Christian and Behling, Spencer and Baldez, Phoenix and Folsom, Micah and Kouzes, Richard and Kukharev, Vladislav and Lintereur, Azaree and Robinson, Sean and Siciliano, Edward and Stave, Sean and Valdez, Patrick},
abstractNote = {Past 3He shortages led to investigations into replacement options for neutron detectors in systems that previously used 3He-based technologies. The goal of this research was to investigate the feasibility of a full-scale lithium fluoride with silver activated zinc sulfide (LiF/ZnS) based neutron multiplicity counter. The LiF/ZnS based neutron multiplicity counter (LiNMC) was developed based on an iterative process between modeling and experimental measurements. Each active region of the LiNMC contains five sheets of LiF/ZnS sandwiched between six sheets of wavelength shifting plastic to form neutron detection stacks. The wavelength shifted scintillation light was collected by photomultiplier tubes located on each end of the stacks. Twelve such detector stacks were placed around a sample chamber in a square arrangement with lithiated high density polyethylene blocks in the corners to reflect high energy neutrons and capture low energy neutrons. Preliminary calibration with a 252Cf neutron source showed that the LiNMC was able to achieve 36% neutron detection efficiency (ε) and an 11.7 μs neutron die-away time (τ) for a doubles Figure-of-merit (ε2/ τ) of 109. This is the highest doubles Figure-of-merit performance measured to-date for a 3He-free neutron multiplicity counter system. By the end of this project, the LiNMC’s basic components were integrated into a single laboratory scale system capable of proof-of-concept measurements.},
doi = {10.1016/j.nima.2018.01.015},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = C,
volume = 887,
place = {United States},
year = {Sun Apr 01 00:00:00 EDT 2018},
month = {Sun Apr 01 00:00:00 EDT 2018}
}