カラム内土壌中における放射性核種濃度分布の非破壊測定
一次元分布の測定
1985 年 54 巻 7 号 p. 738-744
詳細
1985 年 54 巻 7 号 p. 738-744
Tokai Research Establishment, Japan Atomic Energy Research Institute A nondestructive method has been studied for determining the concentration of radionuclide (Cs-137) distributed in a soil column. The concentration distribution was calculated from the counting rate distribution using the efficiency matrix of a detector. The concentration distribution obtained by this method, with measuring efficiencies of theoretical calculation, coincides well with that obtained by the destructive sampling method. This method is, therefore, found to be effective for the measurement of one dimensional concentration distribution. The measuring limit of this method is affected not only by the radionuclide concentration but also by the shape of concentration distribution in a soil column and also by the way it is divided into concentration blocks. It is found that, the radioactive concentration up to 2.6×10-4μCi/g (9.62Bq/g), and also the distribution up to where the concentration reduces to half at every 1cm of depth, can be measured by this system. The concentration blocks can be divided into 1cm of thickness as a minimum value.
