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<p>Cryogenic decay energy spectrometry provides high energy resolution and enables absolute decay counting, offering an alternative measurement technique for radiochronometry. A cryogenic decay energy spectrometry experiment was conducted using a magnetic microcalorimeter to determine the age of a plutonium sample. The energy resolution was measured at 0.05% from 5 to 6&#xa0;MeV. The time since sample purification was determined using the measured concentration ratio of the <sup>241</sup>Am/<sup>241</sup>Pu radiochronometer. Sample age estimates based on&#xa0;<sup>241</sup>Pu alpha-decay and beta-decay counts, along with&#xa0;<sup>241</sup>Am decay counts, align with the expected sample age within expanded uncertainty (<i>k</i> = 2), supporting the accuracy of cryogenic decay energy spectrometry as a radiochronometric method.</p>

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Radioisotope dating of nuclear materials using cryogenic decay energy spectrometry

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年1月29日

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  • Ryan Wood,
  • Geon-bo Kim,
  • Igor Jovanovic,
  • Chang Lee,
  • Nathan Hines,
  • Tashi Parsons-Davis

摘要

Cryogenic decay energy spectrometry provides high energy resolution and enables absolute decay counting, offering an alternative measurement technique for radiochronometry. A cryogenic decay energy spectrometry experiment was conducted using a magnetic microcalorimeter to determine the age of a plutonium sample. The energy resolution was measured at 0.05% from 5 to 6 MeV. The time since sample purification was determined using the measured concentration ratio of the 241Am/241Pu radiochronometer. Sample age estimates based on 241Pu alpha-decay and beta-decay counts, along with 241Am decay counts, align with the expected sample age within expanded uncertainty (k = 2), supporting the accuracy of cryogenic decay energy spectrometry as a radiochronometric method.