External dose estimation of Japanese macaque and Procyon lotor using electron spin resonance spectroscopy

Oka, Toshitaka   ; Takahashi, Atsushi*; Koarai, Kazuma   ; Ono, Takumi*; Tamaki, Hiroaki*; Kino, Yasushi*; Sekine, Tsutomu*; Shimizu, Yoshinaka*; Chiba, Mirei*; Suzuki, Toshihiko*; Aida, Jun*; Osaka, Ken*; Sasaki, Keiichi*; Urushihara, Yusuke*; Suzuki, Masatoshi*; Fujishima, Yohei*; See Thing Goh, V.*; Ariyoshi, Kentaro*; Nakata, Akifumi*; Yamashiro, Hideaki*; Miura, Tomisato*; Fukumoto, Manabu*; Shinoda, Hisashi*

Releases of the radioactive materials from the Fukushima Daiichi Nuclear Power Plant accident result in an ionization exposure to people and animals, the precise dosimetry is required. To estimate the external dose due to the accident, we utilize electron spin resonance (ESR) spectroscopy which is a powerful tool for the dosimetry of external dose. The detection limit of this technique was 146 mGy, so that we have to improve the detection limit for the precise dosimetry. In this work, we developed a novel enamel-dentine separation technique and improved the detection limit down to 43 mGy, and estimated the external dose for Japanese macaque and Procyon lotor collected in Fukushima prefecture.