Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan.
Environ Pollut. 2012 Apr;163:243-7. doi: 10.1016/j.envpol.2012.01.001. Epub 2012 Jan 20.
The Great Eastern Japan Earthquake on March 11, 2011, damaged reactor cooling systems at Fukushima Dai-ichi nuclear power plant. The subsequent venting operation and hydrogen explosion resulted in a large radioactive nuclide emission from reactor containers into the environment. Here, we collected environmental samples such as soil, plant species, and water on April 10, 2011, in front of the power plant main gate as well as 35 km away in Iitate village, and observed gamma-rays with a Ge(Li) semiconductor detector. We observed activation products ((239)Np and (59)Fe) and fission products ((131)I, (134)Cs ((133)Cs), (137)Cs, (110m)Ag ((109)Ag), (132)Te, (132)I, (140)Ba, (140)La, (91)Sr, (91)Y, (95)Zr, and (95)Nb). (239)Np is the parent nuclide of (239)Pu; (59)Fe are presumably activation products of (58)Fe obtained by corrosion of cooling pipes. The results show that these activation and fission products, diffused within a month of the accident.
2011 年 3 月 11 日的东日本大地震破坏了福岛第一核电站的反应堆冷却系统。随后的泄压操作和氢气爆炸导致大量放射性核素从反应堆容器中释放到环境中。在这里，我们于 2011 年 4 月 10 日在电厂大门前以及 35 公里外的 Iitate 村收集了土壤、植物物种和水等环境样本，并使用 Ge(Li)半导体探测器观察伽马射线。我们观察到了活化产物((239)Np 和 (59)Fe)和裂变产物((131)I、(134)Cs ((133)Cs)、(137)Cs、(110m)Ag ((109)Ag)、(132)Te、(132)I、(140)Ba、(140)La、(91)Sr、(91)Y、(95)Zr 和 (95)Nb)。(239)Np 是 (239)Pu 的母核；(59)Fe 可能是冷却管腐蚀产生的 (58)Fe 的活化产物。结果表明，这些活化和裂变产物在事故发生一个月内就扩散开来。
