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Title: Fast multiplicity counter featuring stilbene detectors for special nuclear material assay

Abstract

The Treaty on the Nonproliferation of Nuclear Weapons demands for new instruments to prevent diversion of fissile material and safeguard controls. We present a fast neutron multiplicity counting system based on organic scintillators, i.e. liquid EJ-309 and stilbene. The system is able to detect fission correlated counts and photon and neutron multiplets, needed to quantify fissile mass, without the need of complex electronic circuitry and unfolding procedures, required in moderated systems. Moderated system, typically based on helium-3 detectors, feature a gate time of hundreds of microseconds. Conversely, the use of organic scintillators allows an exceptionally short gate time of hundreds of nanoseconds. This results in a reduction of accidental neutron coincidence. In our system, the superior gamma-neutron discrimination capabilities of stilbene scintillators allow to measure high-order multiplicities (> 3) and the inspection of complex source terms. This counter is thus also suitable for the assay of newer fuels containing plutonium and other fissionable actinides. A prototypal version of the well-counter was assembled and tested at the University of Michigan, using a spontaneous fission and an (a,n) neutron source, i.e. 252Cf and PuBe respectively. Presented measured results show excellent agreement with simulations. The viability of the system to discriminate time-correlated fissionmore » neutrons from random, uncorrelated neutrons was proved. An experimental campaign will be carried out at Idaho National Laboratory in August 2015 to characterize weapon grade plutonium samples.« less

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1405303
Report Number(s):
INL/CON-15-35247
DOE Contract Number:  
DE-AC07-05ID14517
Resource Type:
Conference
Resource Relation:
Conference: IEEE Nuclear Science Symposium, San Diego, CA, USA, October 31–November 7, 2015
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; Multiplicity; Neutron; Well Counter

Citation Formats

Di Fulvio, A., Clarke, S. D., Jordan, T., Shin, T., Sosa, C., Bourne, M. M., Chichester, D., and Pozzi, S. A. Fast multiplicity counter featuring stilbene detectors for special nuclear material assay. United States: N. p., 2015. Web. doi:10.1109/NSSMIC.2015.7582008.
Di Fulvio, A., Clarke, S. D., Jordan, T., Shin, T., Sosa, C., Bourne, M. M., Chichester, D., & Pozzi, S. A. Fast multiplicity counter featuring stilbene detectors for special nuclear material assay. United States. doi:10.1109/NSSMIC.2015.7582008.
Di Fulvio, A., Clarke, S. D., Jordan, T., Shin, T., Sosa, C., Bourne, M. M., Chichester, D., and Pozzi, S. A. Thu . "Fast multiplicity counter featuring stilbene detectors for special nuclear material assay". United States. doi:10.1109/NSSMIC.2015.7582008.
@article{osti_1405303,
title = {Fast multiplicity counter featuring stilbene detectors for special nuclear material assay},
author = {Di Fulvio, A. and Clarke, S. D. and Jordan, T. and Shin, T. and Sosa, C. and Bourne, M. M. and Chichester, D. and Pozzi, S. A.},
abstractNote = {The Treaty on the Nonproliferation of Nuclear Weapons demands for new instruments to prevent diversion of fissile material and safeguard controls. We present a fast neutron multiplicity counting system based on organic scintillators, i.e. liquid EJ-309 and stilbene. The system is able to detect fission correlated counts and photon and neutron multiplets, needed to quantify fissile mass, without the need of complex electronic circuitry and unfolding procedures, required in moderated systems. Moderated system, typically based on helium-3 detectors, feature a gate time of hundreds of microseconds. Conversely, the use of organic scintillators allows an exceptionally short gate time of hundreds of nanoseconds. This results in a reduction of accidental neutron coincidence. In our system, the superior gamma-neutron discrimination capabilities of stilbene scintillators allow to measure high-order multiplicities (> 3) and the inspection of complex source terms. This counter is thus also suitable for the assay of newer fuels containing plutonium and other fissionable actinides. A prototypal version of the well-counter was assembled and tested at the University of Michigan, using a spontaneous fission and an (a,n) neutron source, i.e. 252Cf and PuBe respectively. Presented measured results show excellent agreement with simulations. The viability of the system to discriminate time-correlated fission neutrons from random, uncorrelated neutrons was proved. An experimental campaign will be carried out at Idaho National Laboratory in August 2015 to characterize weapon grade plutonium samples.},
doi = {10.1109/NSSMIC.2015.7582008},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2015},
month = {10}
}

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