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Fujita, Hiroki; Maehara, Yushi; Nagaoka, Mika; Koarashi, Jun
KEK Proceedings 2017-6, p.35 - 39, 2017/11
no abstracts in English
Miwa, Kazuji; Shimada, Taro; Takai, Shizuka; Nabekura, Nobuhide; Takeda, Seiji
no journal, ,
A part of the debris with relatively lower radioactive concentrations, which have been stored in the site of Fukushima Daiichi Nuclear Power Station (1F), have been planned to be recycled for restricted purpose in the 1F site. In this study, we evaluated reference values of upper radiocesium concentrations which are practicable to recycle materials for some applications such as road. Radiation doses for all workers in the 1F site are controlled. There is no previous reference values estimated for restricted recycling under the condition of controlled radiation doses for workers in the 1F site. Therefore, we evaluated the reference values not to exceed the additional air radiation dose as 1Sv/h with recycling the debris, which is the estimated minimum dose rate in the 1F site regarded as background. As a result, the highest value of radiocesium concentration of recycling materials was evaluated to be 100,000 Bq/kg in the case of use as the sub-base in the concrete paving road.
Dohi, Terumi; Di Palma, A.*; Fujiwara, Kenso; Adamo, P.*; Kusano, keiichi*; Kimura, Shigeru*; Kanno, Futoshi*; Iijima, Kazuki
no journal, ,
In the surrounding area of the FDNPS, dust samplers have been used as a means of monitoring the radionuclides concentration in the air. However, the installation of dust samplers requires a power supply, which limits the number and location of the samplers. We aim to establish a method to evaluate the radiocaesium concentration and behavior in the air using moss bags, which have been used in air pollution research. Since the moss bags can be easily installed at any place and time, the establishment of the evaluation method using the moss bags will be effective in creating a sense of security among the local governments and their residents around the FDNPS. In this study, we investigated the applicability of moss bags to the evaluation of the concentration and behavior of radiocaesium in the air.