Novel methodology for the quantitative assay of fissile materials using temporal and spectral β-delayed γ-ray signatures

Chivers, Daniel H.; Alfonso, K.; Goldblum, B. L.; Ludewigt, B.

doi:10.1016/j.nimb.2011.05.013

Cited by 6 publications

(1 citation statement)

References 12 publications

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“…The Fission Induced Electromagnetic Response (FIER) code was developed to meet the need for a transparent, analytical tool to model delayed γ-ray spectra. Building on the work of Chivers, et al [1], FIER implements analytical solutions to the Bateman equations, a series of differential equations describing the transmutation of radioactive species [2,3]. Given a nuclear data library composed of half-lives, decay modes, branching ratios, γ-ray intensities, and independent fission yields, FIER calculates fission product populations and time-dependent delayed γ-ray spectra resulting from a user-specified irradiation scheme.…”

Section: Motivationmentioning

confidence: 99%

FIER: Software for analytical modeling of delayed gamma-ray spectra

Matthews

Goldblum

Bernstein

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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A new software package, the Fission Induced Electromagnetic Response (FIER) code, has been developed to analytically predict delayed γ-ray spectra following fission. FIER uses evaluated nuclear data and solutions to the Bateman equations to calculate the time-dependent populations of fission products and their decay daughters resulting from irradiation of a fissionable isotope. These populations are then used in the calculation of γ-ray emission rates to obtain the corresponding delayed γ-ray spectra. FIER output was compared to experimental data obtained by irradiation of a 235 U sample in the Godiva critical assembly. This investigation illuminated discrepancies in the input nuclear data libraries, showcasing the usefulness of FIER as a tool to address nuclear data deficiencies through comparison with experimental data. FIER provides traceability between γ-ray emissions and their contributing nuclear species, decay chains, and parent fission fragments, yielding a new capability for the nuclear science community.

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Section: Motivationmentioning

confidence: 99%