A Simple presumption for radiocesium concentration in living woods using glass-badge based gamma radiation dose rate detection system

個人積算線量計を用いた樹中放射性セシウム濃度の簡易測定技術

吉原 利一*; 橋田 慎之介*; 河地 有木; 長尾 悠人; 山口 充孝; 鈴井 伸郎; 尹 永根; 藤巻 秀

Yoshihara, Toshihiro*; Hashida, Shinnosuke*; Kawachi, Naoki; Nagao, Yuto; Yamaguchi, Mitsutaka; Suzui, Nobuo; Yin, Y.-G.; Fujimaki, Shu

Radiocesium from the severe accident at the Fukushima Dai-ichi Nuclear Power Plant on 11 March 2011 contaminates large areas. After this, a doubt for forest products, especially of mushroom, is indelible at the areas. Pruned woody parts and litters are containing a considerable amount of radiocesium, and generates a problem at incineration and composting. These mean that more attentive survey for each subject is expected; however, the present survey system is highly laborious/expensive and/or non-effective for this purpose. On the other hand, we can see a glass-badge based radiation dose rate detection system. This system always utilized to detect a personal cumulative radiation dose, and thus, it is not suitable to separate a radiation from a specific object. However, if we can separate a radiation from a specific object and relate it with the own radiocesium concentration, it would enable us to presume the specific concentration with just an easy monitoring but without a destruction of the target nature and a complicated process including sampling, pre-treatment, and detection. Here, we present the concept of the measurement and results of the trials.