移行係数(土壌-農作物)の不確実性低減に関する考察-分類情報に基づくセシウム移行係数値の系統解析-

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Transfer factor (Tf) is empirically obtained as the ratio of radionuclide concentration in plant edible part and that in soil. Because of its simplicity, Tf is widely used in dose estimation of human exposure. However, since Tf concept has not sufficient physical meaning, the estimated results have uncertainty. In practice, large variation range is seen in the Tf values reported in literatures. The method for deceasing the uncertainty should be developed.In the present study, Tf values of cesium (Tf-Cs) reported in a literature were statistically analyzed according to classification variables. Some statistical values (geometric mean, minimum, maximum, percentile values) were shown and the effect of classification on decrease of the uncertainty was evaluated. The following information were obtained;(1) The geometric mean of Tf-Cs obtained from field was greater than that from lysimeter- and pot-experiment.(2) The geometric mean of Tf-Cs obtained in sand was greater than that in loam.(3) Tf-Cs variation in sand were greater than those in loam. Then the uncertainty of Tf-Cs is expected to be decreased in loamy soil.(4) Correlation between soil-pH and Tf-Cs was small. Then soil-pH is not effective information for the decrease of Tf-Cs uncertainty.
日本保健物理学会の論文