National Institute of Radiological Sciences, Anagawa 4-9-1, Inage-ku, Chiba 263-8555, Japan.
Sci Total Environ. 2011 Oct 15;409(22):4885-8. doi: 10.1016/j.scitotenv.2011.07.067. Epub 2011 Sep 8.
Soil samples at different depths (0-2, 5-7 and 10-12cm) were collected from J Village, about 20km south of Fukushima Daiichi Nuclear Power Plant (FNPP) to determine their radionuclide specific activities and activity ratios. The concentrations and activity ratios of (131)I, (134, 136, 137)Cs and (129m)Te were obtained, but only trace amounts of (95)Nb, (110m)Ag and (140)La were detected which were too low to provide accurate concentrations. Radionuclides such as (95)Zr, (103, 106)Ru and (140)Ba that were found in Chernobyl fallout, were not found in these soil samples. This suggests that noble gasses and volatile radionuclides predominated in the releases from FNPP to the terrestrial environment. The average activity ratios of (131)I/(137)Cs, (134)Cs/(137)Cs, (136)Cs/(137)Cs and (129m)Te/(137)Cs were 55, 0.90, 0.22 and 4.0 (corrected to March 11, 2011) in the 0-2cm soil samples of April 20 and 28, 2011.
从福岛第一核电站（FNPP）以南约 20 公里的 J 村采集了不同深度（0-2、5-7 和 10-12cm）的土壤样本，以确定其放射性核素的比活度和活度比。测定了 (131)I、(134、136、137)Cs 和 (129m)Te 的浓度和活度比，但仅检测到痕量的 (95)Nb、(110m)Ag 和 (140)La，其浓度过低，无法提供准确的浓度。在切尔诺贝利沉降物中发现的 (95)Zr、(103、106)Ru 和 (140)Ba 等放射性核素并未在这些土壤样本中发现。这表明 FNPP 向陆地环境释放的放射性核素主要为惰性气体和挥发性核素。2011 年 4 月 20 日和 28 日采集的 0-2cm 土壤样本中，(131)I/(137)Cs、(134)Cs/(137)Cs、(136)Cs/(137)Cs 和 (129m)Te/(137)Cs 的平均活度比分别为 55、0.90、0.22 和 4.0（校正至 2011 年 3 月 11 日）。
