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Development of internal dosimetry evaluation code for chronic exposure after intake of radionuclides

放射性物質摂取後の慢性被ばくに対する内部被ばく線量評価コードの開発

木村 仁宣 ; 木名瀬 栄  ; 波戸 真治*

Kimura, Masanori; Kinase, Sakae; Hato, Shinji*

The Fukushima Daiichi Nuclear Power Plant accident resulted in a wide range of radioactive contamination. The national government and local governments implemented food restrictions to reduce internal exposure from the intake of foodstuffs. It is important that the averted doses to the public are calculated and the effect of these protective actions is evaluated to improve the protective action strategy. Therefore, the assessment of internal doses for chronic exposures is needed because the public takes foodstuffs in daily life. In the present study, we develop the DSYS-chronic code to evaluate internal doses for the chronic exposures. The code has GI-tract model, respiratory tract model, and biokinetic and bioassay models for the ICRP. In the DSYS-chronic, internal doses can be evaluated for continuous or discontinuous intake. The present study shows the outline of the DSYS-chronic and the example of evaluation results of internal doses for the chronic exposures.

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