福岛第一核电站事故后日本东北地区北三陆及津轻海峡沿岸海水中的 134Cs 和 137Cs 活度
134Cs and 137Cs activities in coastal seawater along Northern Sanriku and Tsugaru Strait, northeastern Japan, after Fukushima Dai-ichi Nuclear Power Plant accident.
机构信息
Low Level Radioactivity Laboratory, Institute of Nature and Environmental Technology, Kanazawa University, Nomi, Ishikawa 923-1224, Japan.
出版信息
J Environ Radioact. 2012 Sep;111:116-9. doi: 10.1016/j.jenvrad.2011.09.012. Epub 2011 Oct 19.
A total of 37 seawater samples were collected at 10 sites along the coastline of the Northern Sanriku and Tsugaru Strait, 250-450 km north of the Fukushima Dai-ichi Nuclear Power Plant in April-December 2009 and May-June 2011, and analyzed for (134)Cs and (137)Cs activities using low-background γ-spectrometry. The (134)Cs and (137)Cs activities measured in these samples in May 2011 were found to be 2-3 mBq/L and 2.5-4 mBq/L, respectively. By June, these values had decreased by 25-45%/month and 5-30%/month, respectively. These results can be plausibly explained by surface infusion of these isotopes into the sea by atmospheric transport from Fukushima and their subsequent reduction by water migration to off-shore and deeper regions.
2009 年 4 月至 12 月和 2011 年 5 月至 6 月期间，在福岛第一核电站以北 250-450 公里的北三陆和津轻海峡的海岸线的 10 个地点采集了总共 37 个海水样本，并用低背景 γ 谱法分析了这些样本中的 (134)Cs 和 (137)Cs 活度。2011 年 5 月测量的这些样本中的 (134)Cs 和 (137)Cs 活度分别为 2-3 mBq/L 和 2.5-4 mBq/L。到 6 月，这些值分别每月减少了 25-45%和 5-30%。这些结果可以合理地解释为福岛的大气输送将这些同位素注入海洋，以及随后由于水迁移到近海和更深的区域而导致的减少。
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