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<p>Radiochronometry is a valuable tool for nuclear forensics for the determination of model ages to aim to understand a materials processing history. Interpretation of chronometers can be challenging in complex materials with discordant model ages observed. Measurements of helium resulting from the alpha decay of actinide materials are investigated to see if they correlate to ages and/or dates of casting or last heat treatment. We present the analysis of several plutonium samples, including CRM 126a via electrode furnace-gas analyser set up, to determine the suitability of helium as an additional chronometer. Additionally, a preliminary investigation into the carry-over of helium from plutonium metal into oxides formed at different temperatures, is reported.</p>

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Determining the feasibility of helium in plutonium measurements for application to nuclear forensics

  • 期刊论文

  • 发表日期：

    2025年10月14日

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  • A. Shilling,
  • M. Higginson,
  • R. Harker,
  • C. Gilligan,
  • B. Dawkins,
  • P. Kaye

摘要

Radiochronometry is a valuable tool for nuclear forensics for the determination of model ages to aim to understand a materials processing history. Interpretation of chronometers can be challenging in complex materials with discordant model ages observed. Measurements of helium resulting from the alpha decay of actinide materials are investigated to see if they correlate to ages and/or dates of casting or last heat treatment. We present the analysis of several plutonium samples, including CRM 126a via electrode furnace-gas analyser set up, to determine the suitability of helium as an additional chronometer. Additionally, a preliminary investigation into the carry-over of helium from plutonium metal into oxides formed at different temperatures, is reported.