Tooth enamel ESR dosimetry for Hiroshima black rain zone residents
Zhumadilov K. Ivannikov A. Stepanenko V. Toyoda S. Kazymbet P. Kaprin A. Ivanov S. Shegay P. Endo S. Hoshi M.
1 September 2022Oxford University Press
Journal of Radiation Research
2022#63I61 - I65 pp.
Electron spin resonance (ESR) dosimetry was applied to human tooth enamel in order to obtain individual absorbed doses for victims of the Hiroshima bomb who lived in the black rain area. The so-called black rain fell in the form of precipitation on the western part of Hiroshima city and the northwestern suburbs within a few hours after the explosion of the atomic bomb on 6 August 1945, and exposed the population in this area. Only three tooth samples were collected from this area. Since the teeth were located at positions 1, 2 and 4, only the lingual portion was used for the analysis. The results showed that the excess dose after subtracting natural radiation for one (position 4; hh1) was background, for the second (position 2; hh2) it was 133 mGy, and for the other (position 1; hh3) it was 243 mGy. Based on these results, we further investigated the radiation dose attributed to dental X-rays and head CT scan. Such dose of the hh3 radiographic examination was estimated to be 57-160 mGy, which implies an additional exposure around 135 mGy after subtraction. On the other hand, the dose data of hh1 after subtracting dental X-rays was negative. This may mean that such additional doses are an overestimation. In addition, the effect of sunlight should be considered, which is the same direction of overestimation. As a result, the residual dose of 140 mGy suggests the inclusion of radiation from the black rain.
absorbed dose , electron spin resonance (ESR) , Hiroshima , retrospective dosimetry , tooth enamel
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L.N. Gumilyov Eurasian National University, Munaitpasova 13, Nur-Sultan, 010008, Kazakhstan
A. Tsyb Medical Radiological Research Center, Branch of the National Medical Research Radiological Center, The Ministry of Health of the Russian Federation, Koroleva Str., 4., Kaluga Region, Obninsk, 2490036, Russian Federation
Department of Applied Physics, Faculty of Science, Okayama University of Science, Okayama, 700-0005, Japan
Institute of Radiobiology and Radiation Protection, NJSC Astana Medical University, Beibitshilik Str. 49, Nur-Sultan, 010000, Kazakhstan
L.N. Gumilyov Eurasian National University
A. Tsyb Medical Radiological Research Center
Department of Applied Physics
Institute of Radiobiology and Radiation Protection
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