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<p>The Fukushima Daiichi Nuclear Power Station (FDNPS) accident caused a significant deposition of <sup>137</sup>Cs onto the soil surface. In the present study, the depth profile of a soil sample was collected to check the migration of <sup>137</sup>Cs contamination. <sup>137</sup>Cs activity concentration was measured with a high purity germanium detector (HPGe). The activity concentrations of <sup>137</sup>Cs in the 0–2&#xa0;cm layer was 250 ± 1&#xa0;kBq/kg whereas the 10–15&#xa0;cm depth was 0.5 ± 0.01&#xa0;kBq/kg. Rare earth elements (REEs), uranium (U), and thorium (Th) were measured in the same samples using inductively coupled plasma-mass spectrometry (ICP-MS).</p>

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Distribution of rare earth elements, uranium and thorium in a 137Cs contaminated soil depth profile affected by the Fukushima Daiichi Nuclear Power Station accident

  • 期刊论文

  • 发表日期：

    2025年7月3日

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  • Chiharu Nishiyama,
  • Sara Sakr,
  • Kazumasa Inoue,
  • Thennaarassan Natarajan,
  • Norbert Kavasi,
  • Hideki Arae,
  • Yoshito Watanabe,
  • Sarata Kumar Sahoo

摘要

The Fukushima Daiichi Nuclear Power Station (FDNPS) accident caused a significant deposition of 137Cs onto the soil surface. In the present study, the depth profile of a soil sample was collected to check the migration of 137Cs contamination. 137Cs activity concentration was measured with a high purity germanium detector (HPGe). The activity concentrations of 137Cs in the 0–2 cm layer was 250 ± 1 kBq/kg whereas the 10–15 cm depth was 0.5 ± 0.01 kBq/kg. Rare earth elements (REEs), uranium (U), and thorium (Th) were measured in the same samples using inductively coupled plasma-mass spectrometry (ICP-MS).