2005 Fiscal Year Final Research Report Summary
Distribution of the radiation dose of mammal teeth from South Ural region contaminated by a radiation accident in former Soviet Union
| Project/Area Number |
15405006
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
Risk sciences of radiation/Chemicals
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| Research Institution | Okayama University of Science |
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Principal Investigator |
TOYODA Shin Okayama University of Science, Department of Applied Physics, Associate Professor, 理学部, 助教授 (40207650)
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| Co-Investigator(Kenkyū-buntansha) |
HOSHI Masaharu Research Institute for Radiation Biology and Medicine, 原爆放射線医科学研究所, 教授 (50099090)
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| Project Period (FY) |
2003 – 2005
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| Keywords | ESR / hydroxyapatite / tooth / radiation dose / accident dose / Ural / Semipalatinsk |
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| Research Abstract |
Radioactive nuclei released by radiation accidents of nuclear power plant and by nuclear tests caused serious contamination especially in former Soviet Union which has affected human health. It would be most useful to measure the ESR signal intensities of human teeth in order to estimate the dose of individual human, however, human teeth are not always available. In the present study, we collected mammal teeth in order to investigate the distribution of radiation does in the contaminated areas.
The images of distribution of ^<90>Sr in the cow teeth collected at farms of South Ural region were obtained by Fuji imaging plates with photostimulated luminescence. The average concentrations were correlated well with the level of soil contamination. However, there are still variations in the ^<90>Sr concentration even within the same farm. We tried to obtain the feeding record for the cows, but have not been successful so far. The best chemical conditions to extract enamel from the whole teeth were determined by the experiments changing the temperature, concentration, and duration of alkaline treatments. ESR measurements of some of the teeth from the region showed doses up to 200 mGy. But this largest value should be considered to be a preliminary result.
The present environmental radiation doses of the Semipalatinsk nuclear test site and the regions nearby were not so high, up to twice or three times as high as that of background, however, some of the mammal teeth showed ^<90>Sr concentrations up to several Bq/g where no significant soil contamination has not been reported. We have not identified what gave such an high contamination level in mammal teeth so far.
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Author(s)
K.Zhumadilov, A.Ivannikov, K.N.Apsalikov, Z.Zhumadilov, S.Toyoda, D.Zharlyganova, E.Tieliewuhan, S.Endo, K.Tanaka, C.Miyazawa, T.Okamoto, M.Hoshi
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Journal Title
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Description
「研究成果報告書概要(欧文)」より
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Author(s)
A.Ivannikov, K.Zhumadilov, E.Tieliewuhan, L.Jiao, D.Zharlyganova, K.N.Apsalikov, G.Berekenova, Z.Zhumadilov, S.Toyoda, C.Miyazawa, V.Skvortsov, V.Stepanenko, S.Endo, K.Tanaka, M.Hoshi
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Journal Title
Jour.Radiat.Res 47
Pages: A39-A46
Description
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Author(s)
V.Stepanenko, M.Hoshi, I.K.Bailiff, A.I.Ivannikov, S.Toyoda, M.Yamamoto, S.L.Simon, M.Matsuo, N.Kawano, Z.Zhumadilov, M.S.Sasaki, R.I.Rosenson, K.N.Apsalikov
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Journal Title
Jour.Radiat.Res 47
Pages: A1-A13
Description
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[Journal Article] The 3rd international intercomparison on EPR tooth dosimetry : Part 1, general analysis2005
Author(s)
A.Wieser, R.Debuyst, P.Fattibene, A.Meghzifene, S.Onori, S.N.Bayankin, B.Blackwell, A.Brik, A.Bugay, V.Chumak, B.Ciesielski, M.Hoshi, H.Imata, A.Ivannikov, D.Ivanov, M.Junczewska, C.Miyazawa, B.Pass, M.Penkowski, S.Pivovarov, A.Romanyukha, L.Romanyukha, D.Schauer, O.Scherbina, K.Schultka, A.Shames, S.Sholom, A.Skinner, V.Skvortsov, V.Stepanenko, E.Tielewuhan, S.Toyoda, F.Trompier
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Journal Title
Appl.Radiat.Isot. 62
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Description
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