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<p>In 1968, a US military aircraft equipped with nuclear weapons crashed in Thule, Greenland. As a result, plutonium containing fragments were scattered into the environment. In this work, four hot particles from the Thule area were identified and separated. The <sup>241</sup>Am activity of the particles was determined with gamma spectrometry. Resonant-laser secondary-neutral mass spectrometry was used to determine the isotope ratios of uranium and plutonium. Isotope ratios of <sup>240</sup>Pu/<sup>239</sup>Pu &gt; 0.055 and <sup>235</sup>U/<sup>238</sup>U &gt; 1.2 were observed. A hypothesis is proposed to explain the unexpectedly low uranium enrichment for the nuclear weapons.</p>

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Characterisation of individual micron sized nuclear weapons fragments from the Thule area by rL-SNMS

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月5日

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  • Paul Hanemann,
  • Tobias Weissenborn,
  • David Ohm,
  • Aaron Lehnert,
  • Jixin Qiao,
  • Sven Nielsen,
  • Clemens Walther

摘要

In 1968, a US military aircraft equipped with nuclear weapons crashed in Thule, Greenland. As a result, plutonium containing fragments were scattered into the environment. In this work, four hot particles from the Thule area were identified and separated. The 241Am activity of the particles was determined with gamma spectrometry. Resonant-laser secondary-neutral mass spectrometry was used to determine the isotope ratios of uranium and plutonium. Isotope ratios of 240Pu/239Pu > 0.055 and 235U/238U > 1.2 were observed. A hypothesis is proposed to explain the unexpectedly low uranium enrichment for the nuclear weapons.