生物線量評価モデルの水田環境への適用性に関する検討

概要

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We examined applicability of established assessment tools to Japanese environment, which are developed to evaluate radiological impact for biota.. In this study,we chose two assessment tools,the one is RESRAD-BIOTA which was developed by US-DOE,and the other is ERICA assessment tools which developed by EURATOM. We considered paddy field as the typical Asian environment and used maximum of global fallout nuclide concentrations which were monitored in Joetsu. From our trial calculation for general screening,Tier 1 of ERICA suggested that concentration of ^<137>Cs in aquatic systems is exceeded the screening level. On the other hand, RESRAD-BIOTA, concentration of ^<90>Sr, and terrestrial systems in ERICA were less than screening levels. Thus, we proceeded to apply the ERICA Tier 2 using with same parameter set in Tier 1, and found that each species was not exceeded the screening level. Finally, we calculated dosimetries of considerable species living in paddy field. We tested both tools and we adopted ERICA because of flexibility in body dimensions of adding organism. From our calculation, we concluded that graded approaches which are adopted in RESRAD-BIOTA and ERICA are effective to apply Japanese environment.