Structure and levels of thyroid irradiation in population of contaminated areas of Kaluga region

"Radiation and Risk", 1994, vol. 4, pp. 129-135


Tsyb A.F., Stepanenko V.F., Matveenko E.G., Pitkevich V.A., Ispenkov E.A., Omel'chenko V.N.1, Leshakov S.Yu.1
Medical Radiological Research Center of RAMS, Obninsk
1 Department of Health Care of the Kaluga region administration, Kaluga


In the first weeks after the Chernobyl accident measurements of 131I in thyroid were made in 31 thousand people on the contaminated territories of Russia primarity, Kaluga region and also in Bryansk, Orel and Tula regions. Based on the data obtained in Kaluga region, individual absorbed doses were calculated. The work deals with the results and features of formation of individual and group-averaged thyroid doses. The used methods and models for dose estimation are also discussed. A pronounced age dependence has been established for thyroid doses from iodine radionuclides. The average doses for different age groups in Kaluga region, depending on the contamination level, ranged from 1 cGy to 160 cGy. In some cases, individual doses were as high as 1000 cGy. The statistical distribution of individual doses is characterized by a long "tail" in the domain of large doses and a considerable proportion of people for whom, within the measurement error, exposure doses were estimated to be zero. The obtained data were promptly provided to health care authorities to identify groups of increased radiation risk, take appropriate medical measures and conduct long-term medical observation.

Key words
The frequency of aberrations, chromosomes, blood lymphocytes, children contaminated with radionuclides of the territory, Kaluga region, the spectrum of aberrations, aberrations, markers of radiation exposure.


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