National Institutes for Quantum and Radiological Sciences and Technology (QST), 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan.
National Institutes for Quantum and Radiological Sciences and Technology (QST), 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan.
J Environ Radioact. 2021 Jun;232:106568. doi: 10.1016/j.jenvrad.2021.106568. Epub 2021 Mar 16.
In the present study, Cs and U activity concentrations, U/U activity ratio, and U/U isotope ratio were measured in fifteen soil samples collected from the exclusion zone around the Fukushima Daiichi Nuclear Power Station (FDNPS). The Cs activity concentrations of Fukushima-accident contaminated soil samples ranged from 29.9 to 4780 kBq kg with a mean of 2007 kBq kg. On the other hand, the U activity concentrations of these soil samples ranged from 5.2 to 22.4 Bq kg with a mean of 13.2 Bq kg. The activity ratios of U/U ranged from 0.973 to 1.023. The U/U isotope ratios of these exclusion zone soil samples varied from 0.007246 to 0.007260, and they were similar to the natural terrestrial ratio confirming the natural origin. Using isotope dilution technique, the U/Cs activity ratio was theoretically estimated for highly Cs contaminated soil samples from Fukushima exclusion zone ranged from 5.01 × 10 - 6.16 × 10 with a mean value of 2.51 × 10.
在本研究中，我们测量了来自福岛第一核电站（FDNPS）周围禁区的 15 个土壤样本中的 Cs 和 U 活度浓度、U/U 活度比和 U/U 同位素比。福岛事故污染土壤样本的 Cs 活度浓度范围为 29.9 至 4780 kBq kg，平均值为 2007 kBq kg。另一方面，这些土壤样本的 U 活度浓度范围为 5.2 至 22.4 Bq kg，平均值为 13.2 Bq kg。U/U 的活度比范围为 0.973 至 1.023。这些禁区土壤样本的 U/U 同位素比值从 0.007246 到 0.007260 不等，与自然陆地比值相似，证实了其天然来源。使用同位素稀释技术，我们理论上估算了来自福岛禁区的高 Cs 污染土壤样本的 U/Cs 活度比，范围从 5.01×10 -6 到 1.6×10，平均值为 2.51×10。
