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首页> 外文期刊>Environmental Science & Technology >Activity of ~(90)Sr in Fallout Particles Collected in the Difficult-to-Return Zone around the Fukushima Daiichi Nuclear Power Plant
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Activity of ~(90)Sr in Fallout Particles Collected in the Difficult-to-Return Zone around the Fukushima Daiichi Nuclear Power Plant

机译：福岛第一核电站附近难返区收集的余尘中〜（90）Sr的活性

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摘要

The Fukushima Daiichi Nuclear Power Plant (FDNPP) accident released abundant radioactive particles into the surrounding environment. Herein, we analyzed the activity of Sr-90 in these particles to estimate the contribution of this radionuclide to the overall radiation exposure and shed light on the processes that occurred during the accident. Seven radioactive particles were isolated from the dust and soil samples collected from areas surrounding the FDNPP, and the minimum/maximum Cs-137 activities were determined as 224/4,100 Bq. Based on the size, specific activity, and Cs-134/Cs-137 activity ratios, we concluded that six of the seven radioactive particles were released from the Unit 1 reactor, while one particle was released from the Unit 3 reactor by a hydrogen explosion. Strontium-90 was detected in all radioactive particles, and the minimal/maximal Sr-90 activities were determined as 0.046/1.4 Bq. Cs-137/Sr-90 activity ratios above 1000 were observed for all seven particles, that is, compared to Cs-137, Sr-90 had negligible contribution to the overall radiation exposure. The Cs-137/Sr-90 activity ratios of the radioactive particles were similar to those of terrestrial environmental samples and were higher for particles released from the Unit 1 reactor than for samples collected from the Unit 1 reactor building, which indicates possibility of additional Sr-90-rich contamination after release of the particles.
机译：福岛第一核电站事故使大量放射性粒子释放到周围环境中。在本文中，我们分析了这些颗粒中Sr-90的活性，以估算这种放射性核素对总体辐射暴露的贡献，并阐明了事故期间发生的过程。从FDNPP周围地区收集的灰尘和土壤样品中分离出七个放射性粒子，最小/最大Cs-137活度确定为224 / 4,100 Bq。根据大小，比活和Cs-134 / Cs-137活度比，我们得出结论，七个放射性粒子中有六个是从1号反应堆释放的，而一个粒子是通过氢爆炸从3号反应堆释放的。在所有放射性粒子中均检测到锶90，最小/最大Sr-90活性确定为0.046 / 1.4 Bq。所有七个颗粒的Cs-137 / Sr-90活性比均高于1000，也就是说，与Cs-137相比，Sr-90对总辐射暴露的贡献可忽略不计。放射性粒子的Cs-137 / Sr-90活度比与陆地环境样品的活度比相似，并且从1号反应堆释放的颗粒比从1号反应堆建筑物收集的样品要高，这表明有可能增加Sr释放颗粒后，污染物富含-90。

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  • 来源
    《Environmental Science & Technology》 |2019年第10期|5868-5876|共9页
  • 作者

    Zhang Zijian; Igarashi Junya; Satou Yukihiko; Ninomiya Kazuhiko; Sueki Keisuke; Shinohara Atsushi;

  • 作者单位

    Osaka Univ, Grad Sch Sci, 1-1 Machikaneyama, Toyonaka, Osaka 5600043, Japan;

    Osaka Univ, Grad Sch Sci, 1-1 Machikaneyama, Toyonaka, Osaka 5600043, Japan;

    Japan Atom Energy Agcy, Collaborat Labs Adv Decommissioning Sci, 790-1 Otsuka, Tomioka, Fukushima 9791195, Japan;

    Osaka Univ, Grad Sch Sci, 1-1 Machikaneyama, Toyonaka, Osaka 5600043, Japan;

    Ctr Res Isotopes & Environm Dynam CRiED, 1-1-1 Tennodai, Tsukuba, Ibaraki 3058577, Japan;

    Osaka Univ, Grad Sch Sci, 1-1 Machikaneyama, Toyonaka, Osaka 5600043, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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