The effects of low-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e646" altimg="si2.svg"><mml:mi>Z</mml:mi></mml:math> shielding on uranium isotope discrimination using the time-emission profiles of long-lived delayed neutrons

Ogren, K.; Wu, T.; Nattress, J.; Jovanovic, Igor

doi:10.1016/j.nima.2021.165847

Cited by 3 publications

(4 citation statements)

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“…Finally, delayed neutron profile measurements were conducted with neutron-moderating shielding surrounding the uranium test objects. The results showed that HEU and DU delayed neutron profiles were not significantly distorted by shielding and could still be used as the basis for isotopic discrimination 17 .…”

Section: Resultsmentioning

confidence: 94%

“…Corresponding tabular data fits are overlaid. The only fit parameters are the constant background and neutron emission rate at t = 0 (Adapted from 15 and 17 ). …”

Section: Resultsmentioning

confidence: 99%

“…These experiments focus on neutron active interrogation techniques for characterizing uranium objects based on measurement of induced delayed-neutron signatures. We demonstrate uranium isotopic discrimination 15 and estimation of enrichment based on measurement of the buildup and decay time profiles of long-lived delayed neutron groups 16 , 17 . These profile shapes can be derived from nuclear data and provide a method for estimating uranium enrichment without the need for a calibration standard.…”

Section: Experimental Setupsmentioning

confidence: 99%

“…For completeness, we present results demonstrating shielded uranium characterization. The technique uses delayed neutron emissions during active interrogation of uranium using a neutron generator 15 – 17 .…”

Section: Introductionmentioning

confidence: 99%

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Detecting and characterizing special nuclear material for nuclear nonproliferation applications

Pozzi

Hutchinson

et al. 2023

Sci Rep

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There is an urgent need for new, better instrumentation and techniques for detecting and characterizing special nuclear material (SNM), i.e., highly enriched uranium and plutonium. The development of improved instruments and techniques requires experiments performed with the SNM itself, which is of limited availability. This paper describes the findings of experiments performed at the National Criticality Experiments Research Center conducted using new instruments and techniques on unclassified, kg-quantity SNM objects. These experiments, performed in the framework of the Department of Energy, National Nuclear Security Administration Consortium for Monitoring, Technology, and Verification, focused on detecting, characterizing, and localizing SNM samples with masses ranging from 3.3 to 13.8 kg, including plutonium and highly enriched uranium using prototype detectors and techniques. The work demonstrates SNM detection and characterization using recently-developed prototype detection systems. Specifically, we present new results in passive detection and imaging of plutonium and uranium objects using gamma-ray and dual particle (fast neutron and gamma-ray) imaging. We also present a new analysis of the delayed neutron emissions during active interrogation of uranium using a neutron generator.

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Section: Resultsmentioning

confidence: 94%

“…Corresponding tabular data fits are overlaid. The only fit parameters are the constant background and neutron emission rate at t = 0 (Adapted from 15 and 17 ). …”

Section: Resultsmentioning

confidence: 99%