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<p>Measurement of <sup>185</sup>W is difficult by gamma spectroscopy due to the low intensity of the only gamma emission line. This work investigated the use of ICP-MS/MS, as an alternative to gamma spectroscopy for the quantification of <sup>185</sup>W. Stable standards were analyzed using NH<sub>3</sub>/He and NO reaction gases to determine the interference removal from stable isotope interferences (e.g., <sup>185</sup>Re<sup>+</sup> and <sup>184</sup>W<sup>1</sup>H<sup>+</sup>) prior to analysis which can hinder quantification of <sup>185</sup>W. The NH<sub>3</sub>/He and NO reaction gas methods achieved absolute detection limits for <sup>185</sup>W of 3.9 × 10<sup>7</sup> and 9.9 × 10<sup>6</sup> atoms, respectively. An irradiated W sample was analyzed by dilution using the NH<sub>3</sub>/He method and following chemical separation using the NO method with both methods showing good agreement with GEA (gamma emission analysis). This work reports the first analyses of <sup>185</sup>W using ICP-MS/MS and demonstrates the utility of ICP-MS/MS for the measurement of activation products for nuclear forensics, even those with relatively short half-lives that may have previously been thought impossible at such levels.</p>

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Determination of 185W in irradiated samples using ICP-MS/MS

  • 期刊论文

  • 发表日期：

    2026年1月13日

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  • Amanda D. French,
  • Kirby P. Hobbs,
  • Bruce D. Pierson,
  • Larry R. Greenwood,
  • Staci M. Herman,
  • Evan Warzecha,
  • Isaac J. Arnquist,
  • Chelsie L. Beck

摘要

Measurement of 185W is difficult by gamma spectroscopy due to the low intensity of the only gamma emission line. This work investigated the use of ICP-MS/MS, as an alternative to gamma spectroscopy for the quantification of 185W. Stable standards were analyzed using NH3/He and NO reaction gases to determine the interference removal from stable isotope interferences (e.g., 185Re+ and 184W1H+) prior to analysis which can hinder quantification of 185W. The NH3/He and NO reaction gas methods achieved absolute detection limits for 185W of 3.9 × 107 and 9.9 × 106 atoms, respectively. An irradiated W sample was analyzed by dilution using the NH3/He method and following chemical separation using the NO method with both methods showing good agreement with GEA (gamma emission analysis). This work reports the first analyses of 185W using ICP-MS/MS and demonstrates the utility of ICP-MS/MS for the measurement of activation products for nuclear forensics, even those with relatively short half-lives that may have previously been thought impossible at such levels.