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Title: Direct fissile assay of highly enriched UF/sub 6/ using random self-interrogation and neutron coincidence response

Abstract

A new nondestructive method for direct assay of /sup 235/U mass contained in Model 5A uranium hexafluoride (UF/sub 6/) product storage cylinders has been successfully tested in the laboratory and under field conditions. The technique employs passive neutron self-interrogation and uses the ratio of coincidences-to-totals counts as a measure of bulk fissile mass. The accuracy of the method is 6.8% (1 sigma) based on field measurements of 44 Model 5A cylinders, 11 of which were either only partially filled or contained reactor return material. The cylinders contained UF/sub 6/ with enrichments from 5.96% to 97.6%. Count times were 3 to 6 min depending on /sup 235/U mass. Samples ranged from below 1 kg to over 16 kg of /sup 235/U. Because the method relies primarily on fast neutron self-interrogation, complete sampling of the UF/sub 6/ takes place. This feature alleviates inhomogeneity problems and offers increased assurance of the presence of stated amounts of bulk fissile material as compared with current verification methods.

Authors:
;
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
OSTI Identifier:
5584817
Report Number(s):
LA-UR-83-3266; CONF-831106-12
ON: DE84003780
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Topical meeting on safeguards technology - the process safeguards interface, Hilton Head Island, SC, USA, 28 Nov 1983; Other Information: Portions are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; URANIUM 235; RADIOMETRIC ANALYSIS; URANIUM HEXAFLUORIDE; COINCIDENCE METHODS; CYLINDERS; ENRICHED URANIUM; NEUTRON DETECTION; ACTINIDE COMPOUNDS; ACTINIDE ISOTOPES; ACTINIDE NUCLEI; ACTINIDES; ALPHA DECAY RADIOISOTOPES; CHEMICAL ANALYSIS; COUNTING TECHNIQUES; DETECTION; ELEMENTS; EVEN-ODD NUCLEI; FLUORIDES; FLUORINE COMPOUNDS; HALIDES; HALOGEN COMPOUNDS; HEAVY NUCLEI; ISOMERIC TRANSITION ISOTOPES; ISOTOPE ENRICHED MATERIALS; ISOTOPES; MATERIALS; METALS; MINUTES LIVING RADIOISOTOPES; NUCLEI; QUANTITATIVE CHEMICAL ANALYSIS; RADIATION DETECTION; RADIOISOTOPES; URANIUM; URANIUM COMPOUNDS; URANIUM FLUORIDES; URANIUM ISOTOPES; YEARS LIVING RADIOISOTOPES; 055001* - Nuclear Fuels- Safeguards, Inspection, & Accountability- Technical Aspects; 400103 - Radiometric & Radiochemical Procedures- (-1987)

Citation Formats

Stewart, J E, and Menlove, H O. Direct fissile assay of highly enriched UF/sub 6/ using random self-interrogation and neutron coincidence response. United States: N. p., 1983. Web.
Stewart, J E, & Menlove, H O. Direct fissile assay of highly enriched UF/sub 6/ using random self-interrogation and neutron coincidence response. United States.
Stewart, J E, and Menlove, H O. Sat . "Direct fissile assay of highly enriched UF/sub 6/ using random self-interrogation and neutron coincidence response". United States. https://www.osti.gov/servlets/purl/5584817.
@article{osti_5584817,
title = {Direct fissile assay of highly enriched UF/sub 6/ using random self-interrogation and neutron coincidence response},
author = {Stewart, J E and Menlove, H O},
abstractNote = {A new nondestructive method for direct assay of /sup 235/U mass contained in Model 5A uranium hexafluoride (UF/sub 6/) product storage cylinders has been successfully tested in the laboratory and under field conditions. The technique employs passive neutron self-interrogation and uses the ratio of coincidences-to-totals counts as a measure of bulk fissile mass. The accuracy of the method is 6.8% (1 sigma) based on field measurements of 44 Model 5A cylinders, 11 of which were either only partially filled or contained reactor return material. The cylinders contained UF/sub 6/ with enrichments from 5.96% to 97.6%. Count times were 3 to 6 min depending on /sup 235/U mass. Samples ranged from below 1 kg to over 16 kg of /sup 235/U. Because the method relies primarily on fast neutron self-interrogation, complete sampling of the UF/sub 6/ takes place. This feature alleviates inhomogeneity problems and offers increased assurance of the presence of stated amounts of bulk fissile material as compared with current verification methods.},
doi = {},
url = {https://www.osti.gov/biblio/5584817}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1983},
month = {1}
}

Conference:
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