Variations in AmLi source spectra and their estimation utilizing the 5 Ring Multiplicity Counter

Weinmann-Smith, Robert; Beddingfield, D. H.; Enqvist, Andreas; Swinhoe, Martyn T

doi:10.1016/j.nima.2017.02.083

Cited by 12 publications

(1 citation statement)

References 6 publications

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“…Thus AmBe, which has a mean neutron energy of 5.0 MeV and a maximum of approximately 11.0 MeV, is used instead. The OSCARs measured the RTO assembly for 18 minutes, and the NoMADs measured the RTO assembly for 20 minutes (the last 18 minutes of the NoMAD measurements coincide with the time of OSCAR measurements) [1,3,13].…”

Section: Measurement Specificationsmentioning

confidence: 99%

Simulation of the Nondestructive Assay of²³⁷Np Using Active Neutron Multiplicity Counting

Hua

Goddard

Lloyd

et al. 2019

Nuclear Science and Engineering

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The purpose of nondestructive assay in the context of nuclear safeguards is to precisely verify the declared mass of a sample of nuclear material in a noninhibitive amount of time. 237 Np is a proliferation concern, and the capacity to efficiently assay samples of it is a missing piece in the verification and safeguards toolbox. The material is subject to the same safeguards as 235 U, is reportable in gram quantities, and is classified as "other nuclear material" according to the United States Department of Energy. Given that 3000 kg of 237 Np is annually produced in the US and the bare sphere critical mass is 40-60 kg, it is desirable to augment the safeguards toolbox with a system capable of distinguishing 10 g of 237 Np in a 20-minute measurement. One measurement modality is neutron multiplicity counting, which relates the detected multiplicity count rates to the amount of fissionable material. Prior simulation work shows that an organic scintillator-based multiplicity counter can achieve the design criteria, whereas the flagship 3 He-based system, the Epithermal Neutron Multiplicity Counter, requires much longer measurement times to achieve the same precision. In this work, simultaneous measurements of a 6-kg sphere of 237 Np by organic scintillator-and 3 He-based systems are used to confirm the trends in the simulation study; the organic scintillator-based system achieves 1% uncertainty in the neutron double multiplicity rate on the order of minutes, while the 3 He-based system requires days to reach the same precision. In conclusion, the International Atomic Energy Agency should consider the development and deployment of an organic scintillator-based multiplicity counter.

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Section: Measurement Specificationsmentioning

confidence: 99%

Simulation of the Nondestructive Assay of²³⁷Np Using Active Neutron Multiplicity Counting

Hua

Goddard

Lloyd

et al. 2019

Nuclear Science and Engineering

View full text Add to dashboard Cite

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Additional Topics

Hendricks

Swinhoe

Favalli

2022

Monte Carlo N-Particle Simulations for Nuclear Detection and Safeguards

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Careful scrutiny of MCNP output is required to ensure the results obtained are the results desired. The principal sources of error are examined with recommendations on how to detect them and avoid them. There are some situations where the MCNP default physics treatments are inadequate and different options should be selected. Most MCNP physics is very robust, but other physics is more approximate such as charged particle transport, secondary particle emission, and radioactive activation and decay. Differences between MCNP table and model physics are highlighted.

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Neutron spectrum reconstruction for liquid organic scintillators in low information scenarios via genetic algorithm

Halvic

Prasad

2022

Pramana - J Phys

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Variations in AmLi source spectra and their estimation utilizing the 5 Ring Multiplicity Counter

Abstract: 2017-08-25T16:27:46

Cited by 12 publications

References 6 publications

Simulation of the Nondestructive Assay of²³⁷Np Using Active Neutron Multiplicity Counting

Simulation of the Nondestructive Assay of²³⁷Np Using Active Neutron Multiplicity Counting

Additional Topics

Neutron spectrum reconstruction for liquid organic scintillators in low information scenarios via genetic algorithm

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Variations in AmLi source spectra and their estimation utilizing the 5 Ring Multiplicity Counter

Abstract: 2017-08-25T16:27:46

Cited by 12 publications

References 6 publications

Simulation of the Nondestructive Assay of237Np Using Active Neutron Multiplicity Counting

Simulation of the Nondestructive Assay of237Np Using Active Neutron Multiplicity Counting

Additional Topics

Neutron spectrum reconstruction for liquid organic scintillators in low information scenarios via genetic algorithm

Contact Info

Product

Resources

About

Simulation of the Nondestructive Assay of²³⁷Np Using Active Neutron Multiplicity Counting

Simulation of the Nondestructive Assay of²³⁷Np Using Active Neutron Multiplicity Counting