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Title: Passive assay of plutonium metal plates using a fast-neutron multiplicity counter

Here, we developed a fast-neutron multiplicity counter based on organic scintillators (EJ-309 liquid and stilbene). The system detects correlated photon and neutron multiplets emitted by fission reactions, within a gate time of tens of nanoseconds. The system was used at Idaho National Laboratory to assay a variety of plutonium metal plates. A coincidence counting strategy was used to quantify the 240Pu effective mass of the samples. Coincident neutrons, detected within a 40-ns coincidence window, show a monotonic trend, increasing with the 240Pu-effective mass (in this work, we tested the 0.005–0.5 kg range). After calibration, the system estimated the 240Pu effective mass of an unknown sample ( 240Pu eff >50 g) with an uncertainty lower than 1% in a 4-min assay time.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ; ORCiD logo [2] ;  [1]
  1. Univ. of Michigan, Ann Arbor, MI (United States)
  2. Idaho National Lab. (INL), Idaho Falls, ID (United States)
Publication Date:
Report Number(s):
INL/JOU-17-40807-Rev000
Journal ID: ISSN 0168-9002
Grant/Contract Number:
AC07-05ID14517; NA0002534
Type:
Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 855; Journal Issue: C; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Research Org:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGYl; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Plutonium; Assay; Fast Neutron Multiplicity; safeguards; fast-neutron multiplicity counter; organic scintillators; plutonium metal
OSTI Identifier:
1470976
Alternate Identifier(s):
OSTI ID: 1416602

Di Fulvio, A., Shin, T. H., Jordan, T., Sosa, C., Ruch, M. L., Clarke, S. D., Chichester, D. L., and Pozzi, S. A.. Passive assay of plutonium metal plates using a fast-neutron multiplicity counter. United States: N. p., Web. doi:10.1016/j.nima.2017.02.082.
Di Fulvio, A., Shin, T. H., Jordan, T., Sosa, C., Ruch, M. L., Clarke, S. D., Chichester, D. L., & Pozzi, S. A.. Passive assay of plutonium metal plates using a fast-neutron multiplicity counter. United States. doi:10.1016/j.nima.2017.02.082.
Di Fulvio, A., Shin, T. H., Jordan, T., Sosa, C., Ruch, M. L., Clarke, S. D., Chichester, D. L., and Pozzi, S. A.. 2017. "Passive assay of plutonium metal plates using a fast-neutron multiplicity counter". United States. doi:10.1016/j.nima.2017.02.082. https://www.osti.gov/servlets/purl/1470976.
@article{osti_1470976,
title = {Passive assay of plutonium metal plates using a fast-neutron multiplicity counter},
author = {Di Fulvio, A. and Shin, T. H. and Jordan, T. and Sosa, C. and Ruch, M. L. and Clarke, S. D. and Chichester, D. L. and Pozzi, S. A.},
abstractNote = {Here, we developed a fast-neutron multiplicity counter based on organic scintillators (EJ-309 liquid and stilbene). The system detects correlated photon and neutron multiplets emitted by fission reactions, within a gate time of tens of nanoseconds. The system was used at Idaho National Laboratory to assay a variety of plutonium metal plates. A coincidence counting strategy was used to quantify the 240Pu effective mass of the samples. Coincident neutrons, detected within a 40-ns coincidence window, show a monotonic trend, increasing with the 240Pu-effective mass (in this work, we tested the 0.005–0.5 kg range). After calibration, the system estimated the 240Pu effective mass of an unknown sample (240Pueff >50 g) with an uncertainty lower than 1% in a 4-min assay time.},
doi = {10.1016/j.nima.2017.02.082},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = C,
volume = 855,
place = {United States},
year = {2017},
month = {5}
}