ESR dosimetry study on population of settlements nearby Ust-Kamenogorsk city, Kazakhstan |
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Authors: | Kassym Zhumadilov Alexander Ivannikov Dinara Zharlyganova Zhaxybay Zhumadilov Valeriy Stepanenko Kazbek Apsalikov Mohd Rodzi Ali Anara Zhumadilova Shin Toyoda Satoru Endo Kenichi Tanaka Tetsuji Okamoto Masaharu Hoshi |
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Institution: | 1. Research Institute for Radiation Biology and Medicine, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, 734-8553, Japan 2. Medical Radiological Research Center, Korolyov str., 4, 249020, Obninsk, Russia 3. Astana Medical University, 51a, Beibitshilik str., Astana, 010000, Kazakhstan 4. Scientific-Research Institute for Radiation Medicine and Ecology, Semey, 071400, Kazakhstan 5. Department of Applied Physics, Okayama University of Science, 1-1 Ridai, Okayama, 700-0005, Japan 6. Department of Quantum Energy Applications, Graduated School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, 739-8527, Japan 7. Division of Physics, Department of Liberal Arts and Sciences, Center of Medical Education, Sapporo Medical University South 1, West 17, Chuo-ku, Sapporo, Hokkaido, 060-8556, Japan 8. Division of Frontier Medical Science, Department of Molecular Oral Medicine and Maxillofacial Surgery, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, 734-8553, Japan
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Abstract: | The method of electron spin resonance (ESR) dosimetry has been applied to human tooth enamel, to obtain individual absorbed doses of residents of settlements in vicinity of Ust-Kamenogorsk city, Kazakhstan (located about 400 km to the east from the epicenter of explosion at the Semipalatinsk Nuclear Test Site, SNTS). This region developed as a major mining and metallurgical center during the Soviet period (uranium production). Most of the investigated settlements (Ust-Kamenogorsk city, Glubokoe, Tavriya, Gagarino) are located near the central axis of the radioactive fallout trace that originated from the surface nuclear test on 24 August 1956, while the Kokpekty settlement (located 400 km to the Southeast from SNTS) was chosen as a control because it was not subjected to any radioactive contamination. In total, 44 samples were measured. It was found that the excess doses obtained after subtraction of natural background radiation ranged up to about 114 mGy for residents of Ust-Kamenogorsk city, whose tooth enamel was formed before 1956. For residents of Gagarino, excess doses did not exceed 47 mGy for all ages. For residents of Tavriya, the maximum excess dose was 54 mGy, while for residents of Glubokoe it was about 58 mGy. For the population of the Shemonaikha settlements located at a distance of about 70 km from the central axis of the radioactive fallout trace, highest excess doses were 110 mGy. These high doses may be due to the influence of uranium enterprises located in that region, but probably not due to dental X-ray irradiation. For a final conclusion on the radiological situation in this region, the number of samples was too small and, therefore, more work is required to obtain representative results. |
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