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Title: 235U Determination using In-Beam Delayed Neutron Counting Technique at the NRU Reactor

This paper describes a collaborative effort that saw the Royal Military College of Canada (RMC)’s delayed neutron and gamma counting apparatus transported to Canadian Nuclear Laboratories (CNL) for use in the neutron beamline at the National Research Universal (NRU) reactor. Samples containing mg quantities of fissile material were re-interrogated, and their delayed neutron emissions measured. This collaboration offers significant advantages to previous delayed neutron research at both CNL and RMC. This paper details the determination of 235U content in enriched uranium via the assay of in-beam delayed neutron magnitudes and temporal behavior. 235U mass was determined with an average absolute error of ± 2.7 %. This error is lower than that obtained at RMCC for the assay of 235U content in aqueous solutions (3.6 %) using delayed neutron counting. Delayed neutron counting has been demonstrated to be a rapid, accurate, and precise method for special nuclear material detection and identification.
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [3] ;  [2] ;  [2] ;  [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Canadian Nuclear Labs., Chalk River, ON (Canada)
  3. Royal Military College of Canada, Kingston, ON (United States)
Publication Date:
OSTI Identifier:
1226894
Report Number(s):
LA-UR--15-24339
TRN: US1700245
DOE Contract Number:
AC52-06NA25396
Resource Type:
Conference
Resource Relation:
Conference: American Nuclear Society Conference, Washington, DC (United States), 9 Nov 2015
Research Org:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org:
NSERC
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION; DELAYED NEUTRONS; URANIUM 235; NRU REACTOR; AQUEOUS SOLUTIONS; ENRICHED URANIUM; COUNTING TECHNIQUES; NEUTRON EMISSION; DATA COVARIANCES; DETECTION; MASS; FISSILE MATERIALS; ISOTOPE RATIO; NEUTRON BEAMS neutron beamline, delayed neutron counting