"Radiation and Risk", 1996, vol. 7, pp. 253-258

Authors

Nori Nakamura, Midori Iwasaki¹, Chyuzo Miyazawa¹, Katsumi Niwa¹, Mitoshi Akiyama, Shozo Sawada², Akio A.Awa
Departments of Genetics and Radiobioloqy, Radiation Effects Research Foundation, Hiroshima, Japan;
¹ Departments of Dental Radiology and Preventive Dentistry, Ohu University, Koriyama, Japan;
² Department of Radiobioloqy, Research Institute for Nuclear Medicine and Bioloqy, Hiroshima University, Hiroshima, Japan

Abstract

Electron spin resonance (ESR) measurement was conducted for 11 teeth donated by 10 atomic-bomb survivors in Hiroshima. The ESR signal intensity and chromosome aberration fre- quency in lymphocytes of the tooth donors showed a good correlation. In one exceptional case, however, high chromosome aberration frequency failed to accompany any sign of radiation ex- posure in tooth enamel. The sample was found to be a wisdom tooth and the donor was 15 years of age at the time of bombing, raising a possibility that the enamel of the tooth was not completely developed at the time of radiation exposure. Our experience shows importance to collect detailed information on the donors whose biological materials were used for radiation dose reconstruction.

Key words
Estimation, external radiation doses, atomic bomb survivors, EPR spectroscopy, tooth enamel, frequency of chromosome aberrations, reconstruction of radiation dose.

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