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Title: Direct fissile assay of enriched uranium using random self-interrogation and neutron coincidence response

Abstract

Apparatus and method for the direct, nondestructive evaluation of the .sup.235 U nuclide content of samples containing UF.sub.6, UF.sub.4, or UO.sub.2 utilizing the passive neutron self-interrogation of the sample resulting from the intrinsic production of neutrons therein. The ratio of the emitted neutron coincidence count rate to the total emitted neutron count rate is determined and yields a measure of the bulk fissile mass. The accuracy of the method is 6.8% (1.sigma.) for cylinders containing UF.sub.6 with enrichments ranging from 6% to 98% with measurement times varying from 3-6 min. The samples contained from below 1 kg to greater than 16 kg. Since the subject invention relies on fast neutron self-interrogation, complete sampling of the UF.sub.6 takes place, reducing difficulties arising from inhomogeneity of the sample which adversely affects other assay procedures.

Inventors:
 [1];  [1]
  1. Los Alamos, NM
Issue Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM
OSTI Identifier:
866026
Patent Number(s):
4617466
Assignee:
United States of America as represented by United States (Washington, DC)
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
direct; fissile; assay; enriched; uranium; random; self-interrogation; neutron; coincidence; response; apparatus; method; nondestructive; evaluation; 235; nuclide; content; samples; containing; uo; utilizing; passive; sample; resulting; intrinsic; production; neutrons; therein; ratio; emitted; count; rate; total; determined; yields; measure; bulk; mass; accuracy; sigma; cylinders; enrichments; ranging; 98; measurement; times; varying; 3-6; contained; below; kg; 16; subject; relies; fast; complete; sampling; takes; reducing; difficulties; arising; inhomogeneity; adversely; affects; procedures; nondestructive evaluation; enriched uranium; fast neutron; count rate; adversely affect; passive neutron; neutron coincidence; times varying; samples containing; nuclide content; emitted neutron; neutron count; coincidence count; /250/376/

Citation Formats

Menlove, Howard O, and Stewart, James E. Direct fissile assay of enriched uranium using random self-interrogation and neutron coincidence response. United States: N. p., 1986. Web.
Menlove, Howard O, & Stewart, James E. Direct fissile assay of enriched uranium using random self-interrogation and neutron coincidence response. United States.
Menlove, Howard O, and Stewart, James E. Wed . "Direct fissile assay of enriched uranium using random self-interrogation and neutron coincidence response". United States. https://www.osti.gov/servlets/purl/866026.
@article{osti_866026,
title = {Direct fissile assay of enriched uranium using random self-interrogation and neutron coincidence response},
author = {Menlove, Howard O and Stewart, James E},
abstractNote = {Apparatus and method for the direct, nondestructive evaluation of the .sup.235 U nuclide content of samples containing UF.sub.6, UF.sub.4, or UO.sub.2 utilizing the passive neutron self-interrogation of the sample resulting from the intrinsic production of neutrons therein. The ratio of the emitted neutron coincidence count rate to the total emitted neutron count rate is determined and yields a measure of the bulk fissile mass. The accuracy of the method is 6.8% (1.sigma.) for cylinders containing UF.sub.6 with enrichments ranging from 6% to 98% with measurement times varying from 3-6 min. The samples contained from below 1 kg to greater than 16 kg. Since the subject invention relies on fast neutron self-interrogation, complete sampling of the UF.sub.6 takes place, reducing difficulties arising from inhomogeneity of the sample which adversely affects other assay procedures.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1986},
month = {1}
}

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