Re-evaluation of thyroid doses in Russia after the Chernobyl accident

Stepanenko, Valeriy; Gavrilin, Yuri I; Khrouch, Valeri; Shinkarev, Sergey; Hoshi, Masaharu; Яськова, Е К; Kondrashov, A.E.; Petin, D.V.; Moskovko, L. I.; Takada, Jun; Skvortsov, Valery G; Orlov, M. Yu.; Ivannikov, A.I.; Ermakova, Nataly M; Цыб, А. Ф.; Прошин, А. Д.; Rivkind, Nikolay B

doi:10.1016/s0531-5131(01)00621-5

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“…It was also found by questioning the public that the consumption of locally produced milk, as a rule, did not stop. The appearance of new information made it necessary to re-assess the irradiation dose to the thyroid gland in people living in Kaluga oblast; this was done during this same period [12,15]. The individual values of the irradia- Analysis showed that the distribution of the individual does is nearly log-normal, i.e., the individual dose for some people who were examined is much higher than the average and median doses.…”

Section: Materials and Methods Of Investigationmentioning

confidence: 99%

Internal irradiation of the thyroid gland in residents of Kaluga Oblast from results of 131I content measurements performed in May 1986

Stepanenko¹,

Yaskova²,

Orlov³

et al. 2008

At Energy

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The content of 131 I in the thyroid gland of approximately 30000 residents of Kaluga oblast was measured in May 1986. The work was supported by calibration and verification of the measurement means and procedure. The data making it possible to evaluate the individual, average, median, and collective dose of internal irradiation of the thyroid gland in people of different ages in the populated points of the oblast are presented. The irradiation dose to the thyroid gland in children is much higher than for adults. It is found that the individual dose of internal irradiation to the thyroid gland is described by a nearly log-normal distribution. Some of the individuals examined have an individual dose which is several-fold higher than the average and median dose. This indicates the presence of groups with an elevated radiation risk; attention should be focused on this group first when medical-prophylactic and protective measures are taken. The data from Kaluga oblast, combined with similar results from Bryansk oblast and Belarus, have served as basis for reconstructing the individual absorbed irradiation dose to the thyroid gland and as dosimetric support of radiation-epidemiological studies using the case-monitoring procedure.Works devoted to evaluating radiation as a cause of thyroid cancer have recently been published. These estimates were obtained during epidemiological investigations of thyroid cancer by the case-monitoring method for individuals who were present on the territory of Ukraine, Belarus, and Russia which was contaminated with radionuclides as a result of the accident at the Chernobyl nuclear power plant [1][2][3]. An important component of such studies is assessment of the individual irradiation dose to the thyroid gland taking account of the errors in the corresponding models [4]. Verification of the retrospective assessment of the dose requires use of direct measurements of the 131 I content in the thyroid gland which were performed shortly after the accident. The results of the analysis of the measurements and the irradiation dose assessments for children in Ukraine and Belarus are well known (see, for example, [5,6]). At the same time, the first Russian data on Kaluga oblast are presented only in sources which are difficult to access -primarily in the form of reports or publications of limited use (report of the Medical Radiology Science Center (MRSC) of the Russian Academy of Medical Sciences for the Ministry of Health of the USSR, 1986).This article presents information on the measurement methods, the volume of measurements, and the assessments of the individual internal irradiation dose from 131 I in the thyroid gland for approximately 30000 residents of the contaminated regions of Kaluga oblast during the radioactive fallout period.

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Section: Materials and Methods Of Investigationmentioning

confidence: 99%