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Modelling the reductions in ambient dose equivalent rates due to weathering and human activities after the Fukushima accident

福島第一原子力発電所事故後のウェザリングや人間活動による空間線量率減少に関するモデリング

木名瀬 栄   

Kinase, Sakae

After the Fukushima Dai-ichi Nuclear Power Plant (F1NPP) accident, external exposures from deposited radionuclides are major dose contribution to the people in inhibited areas. It is essential to develop prediction models allowing follow-up of the radiological situation for three phases such as the early, intermediate and late phases of the F1NPP accident. At the JAEA/Ibaraki University, the prediction models have been developed to assess how ambient dose equivalent rates might change during the three phases. Model parameters such as the ecological half-lives of deposited radionuclides for land-use and relative proportion of the two components in the prediction models were evaluated using the changes with time in ambient dose equivalent rates through car-borne surveys. It was found that the ecological half-lives among land-use differ only slightly, whereas the relative contribution from the long-term component of the prediction models is clearly dependent on land-use.

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