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Title: DIRECTIONAL DETECTION OF FISSION-SPECTRUM NEUTRONS.

Abstract

Conventional neutron detectors consisting of {sup 3}He tubes surrounded by a plastic moderator can be quite efficient in detecting fission spectrum neutrons, but do not indicate the direction of the incident radiation. We have developed a new directional detector based on double proton recoil in two separated planes of plastic scintillators. This method allows the spectrum of the neutrons to be measured by a combination of peak amplitude in the first plane and time of flight to the second plane. It also allows the determination of the angle of scattering in the first plane. If the planes are position-sensitive detectors, then the direction of the scattered neutron is known, and the direction of the incident neutron can be determined to lie on a cone of s fixed angle. The superposition of many such cones generates an image that indicates the presence of a localized source. Typical background neutron fluences from the interaction of cosmic rays with the atmosphere are low and fairly uniformly distributed in angle. Directional detection helps to locate a manmade source in the presence of natural background. Monte Carlo simulations are compared with experimental results.

Authors:
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
Doe - National Nuclear Security Administration
OSTI Identifier:
909964
Report Number(s):
BNL-77959-2007-CP
R&D Project: 10512; NN2001030; TRN: US0704048
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Conference
Resource Relation:
Conference: IEEE LISAT 2007; FARMINGDALE STATE COLLEGE, FARMINGDALE, NEW YORK; 20070504 through 20070504
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AMPLITUDES; CONES; DETECTION; EDUCATIONAL FACILITIES; FISSION; MODERATORS; NEUTRON DETECTORS; NEUTRON FLUENCE; NEUTRONS; PLASTIC SCINTILLATORS; PLASTICS; PROTONS; SCATTERING

Citation Formats

VANIER,P.E.. DIRECTIONAL DETECTION OF FISSION-SPECTRUM NEUTRONS.. United States: N. p., 2007. Web.
VANIER,P.E.. DIRECTIONAL DETECTION OF FISSION-SPECTRUM NEUTRONS.. United States.
VANIER,P.E.. Fri . "DIRECTIONAL DETECTION OF FISSION-SPECTRUM NEUTRONS.". United States. doi:. https://www.osti.gov/servlets/purl/909964.
@article{osti_909964,
title = {DIRECTIONAL DETECTION OF FISSION-SPECTRUM NEUTRONS.},
author = {VANIER,P.E.},
abstractNote = {Conventional neutron detectors consisting of {sup 3}He tubes surrounded by a plastic moderator can be quite efficient in detecting fission spectrum neutrons, but do not indicate the direction of the incident radiation. We have developed a new directional detector based on double proton recoil in two separated planes of plastic scintillators. This method allows the spectrum of the neutrons to be measured by a combination of peak amplitude in the first plane and time of flight to the second plane. It also allows the determination of the angle of scattering in the first plane. If the planes are position-sensitive detectors, then the direction of the scattered neutron is known, and the direction of the incident neutron can be determined to lie on a cone of s fixed angle. The superposition of many such cones generates an image that indicates the presence of a localized source. Typical background neutron fluences from the interaction of cosmic rays with the atmosphere are low and fairly uniformly distributed in angle. Directional detection helps to locate a manmade source in the presence of natural background. Monte Carlo simulations are compared with experimental results.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri May 04 00:00:00 EDT 2007},
month = {Fri May 04 00:00:00 EDT 2007}
}

Conference:
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