ESR DOSIMETRY OF ENAMEL AND DENTIN TAKEN FROM VICTIMS OF JCO
Shin Toyoda (Okayama University of Science, 1-1 Ridai, Okayama, 700-0005, Japan,
email@example.com), Eldana Tieliewuhan, Satoru Endo (Hiroshima University, Japan),
Ken’ichi Tanaka (Sapporo Medical University, Japan), Kunio Shiraishi (National Institute of
Radiological Sciences, Japan), Chuzo Miyazawa (Ohu Univeristy, Japan), Alexandre Ivannikov
(Research Institute for Radiation Biology and Medicine, Russia), Masaharu Hoshi (Hiroshima
University, Japan), Kenzo Fujimoto, Makoto Akashi (National Institute of Radiological Sciences,
Gamma and neutron doses were estimated for the teeth taken from two victims of the
critical accident at JCO nuclear fuel conversion facility in Tokai-mura on September, 30, 1999.
Based on the difference in sensitivities of the dosimetric ESR (electron spin resonance) signal to
gamma and neutron doses for enamel and dentin, those doses were calculated from the ones
equivalent to gamma ray doses which are the direct measure of the ESR measurements. The
ESR (equivalent) doses were obtained both for enamel and dentin samples of two victims by the
calibration method. The gamma ray doses were estimated to be 10.2 ± 0.4 and 9.4 ± 0.6 Gy
while meaningful neutron doses were not obtained due to the characteristics of the equation and
sensitivity factors which yield large error in calculating neutron doses.