10.1016/j.radmeas.2025.107496">
 

Document Type

Article

Publication Date

8-8-2025

Department

Department of Engineering Physics

School or Division

Graduate School of Engineering and Management

Digital Object Identifier

10.1016/j.radmeas.2025.107496

Source Publication

Radiation Measurements (ISSN 1350-4487 | eISSN 1879-0925)

Abstract

The measurement of neutron energy spectra using a Bonner Sphere Spectrometer (BSS) requires spectrum unfolding. One necessary component of spectrum unfolding is an accurate neutron response matrix, which describes the energy shift experienced by neutrons when passing through different moderation configurations prior to detection. Leveraging the recently-released ENDF/B-VIII.0 cross-section library, this work details the development of a new LiI(Eu) scintillator response matrix that features improved energy binning granularity as well as increased isotopic and statistical accuracy. Using MCNP6.2, detector responses were modeled at 105 discrete log-equi-spaced incident neutron energies from 1.000 × 10−9 to 2.512 × 101 MeV with a maximum relative error of 1.0%. Comparison with corresponding data from previous work reflects an average variation within 0.025%, reinforcing confidence in the expanded measurements. The impact of 127I within the scintillator crystal and resulting structure within these novel response functions is also explored, along with previously unexplained variations between prior published works.

Comments

This article was published by Elsevier online at their ScienceDirect portal in August 2025 ahead of inclusion in the November 2025 issue of Radiation Measurements.

© 2025 The Authors.

This article is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0), which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Sourced from the published version of record cited below.

Adam Card was an AFIT graduate student at the time of the publication of this article.

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