Sample preparation procedure for ESR dosimetry using teeth of wild animal

Oka, Toshitaka   ; Mitsuyasu, Yusuke*; Takahashi, Atsushi*; Koarai, Kazuma   ; Kino, Yasushi*; Sekine, Tsutomu*; Okutsu, Kenichi*; Yamashita, Takuma*; Shimizu, Yoshinaka*; Chiba, Mirei*; Suzuki, Toshihiko*; Osaka, Ken*; Sasaki, Keiichi*; Fujishima, Yohei*; Urushihara, Yusuke*; Goh, V. S. T.*; Ariyoshi, Kentaro*; Nakata, Akifumi*; Yamashiro, Hideaki*; Suzuki, Masatoshi*; Fukumoto, Manabu*; Miura, Tomisato*; Shinoda, Hisashi*

Releases of the radioactive materials from the Fukushima Daiichi Nuclear Power Plant accident result in a low dose exposure to wild animals. The external dose of wild animals is commonly estimated by the external dose rate of the captured point, but the estimated exposure dose has huge uncertainties because the size of the habitat and/or the movement of the wild animals are not included in the estimation. To estimate the external dose precisely, we utilize electron spin resonance (ESR) dosimetry. In this work, we investigated the sample preparation procedure of wild animals. The ESR spectrum of enamel of racoon captured in Namie-town, Fukushima has a broad ESR signal due to metal components. The linear relationship between the Co intensity and the absorbed dose that we can apply ESR dosimetry for racoon teeth. Using this relationship, the external exposure dose was estimated.