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Operational level for unconditional release of contaminated property from affected areas around Fukushima Daiichi nuclear power plant

机译:从福岛第一核电站周围受灾地区无条件释放受污染财产的运行水平

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摘要

This paper focuses on the surface contamination control of slightly contaminated property after the Fukushima nuclear accident. The operational level for the unconditional release of contaminated properties is calculated in counts per minute (cpm) to enable the use of a typical Geiger-Muller (GM) survey meter with a 50-mm bore, on the basis of the surficial clearance level of 10 Bq cm−2 for 134Cs and 137Cs derived in the previous studies of the authors. By applying a factor for the conversion of the unit surface contamination to the count rate of a survey meter widely used after the Fukushima accident, the operational level for the unconditional release of contaminated properties was calculated to be 2300 cpm on average and 23 000 cpm at the highest-contamination part. The calculated numerical values of the operational levels are effective as long as the typical GM survey meter is used in the radiation measurement.
机译:本文着重研究了福岛核事故后轻微污染财产的表面污染控制。以每分钟计数(cpm)计算无条件释放受污染特性的操作水平,以便能够根据表面间隙水平使用典型的具有50mm孔径的Geiger-Muller(GM)测量仪。作者先前研究得出的 134 Cs和 137 Cs为10 Bq cm −2 。通过将单位表面污染的转换因子转换为福岛事故后广泛使用的测量仪表的计数率,无条件释放受污染特性的操作水平计算为平均2300 cpm和23 000 cpm。最高污染的部分只要在辐射测量中使用典型的GM测量仪,计算得出的运行水平数值就有效。

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