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140 results on '"Tolstykh, E. I."'

24. Retrospective dosimetry related to chronic environmental exposure

Author

Degteva, M. O, Kozheurov, V. P, Tolstykh, E. I, and Neta, R

Subjects
Environment Pollution
Abstract

Radioactive contamination of the environment occurred in the early fifties as a result of the releases from the Mayak plutonium production complex (Southern Urals, Russia). The releases of liquid wastes into the Techa river resulted in chronic exposure of 30,000 residents of the riverside communities. Since 1951 90Sr body burdens have been measured for over half of this cohort. This paper presents the analysis of data on 90Sr in humans and describes the reconstruction of internal doses for these people.

Published
1998

25. Strontium transfer from maternal skeleton to the fetus estimated on the basis of the Techa river data

Author

Tolstykh, E. I, Degteva, M. O, Kozheurov, V. P, Burmistrov, D. S, and Neta, R

Subjects
Environment Pollution
Abstract

Measurements of 90Sr in human bone of inhabitants of the Techa river region were started in 1951, and since 1974 the Techa river population has been studied with a whole-body counter. One of the dosimetric tasks that could be decided using data on 90Sr measurements is direct evaluation of strontium transfer to the fetus from the maternal skeleton. Six cases were selected for which 90Sr measurements were available both for stillborn infants and their mothers. The ratio of 90Sr concentrations in fetal bone to maternal bone for the year of pregnancy has been evaluated. Two clusters of values were found and the difference between clusters could be explained by age-dependent features of maternal bone formation and remodelling. When the mother's 90Sr intake occurred in the period of intensive compact bone growth, the transfer coefficient was very low (0.012-0.032). If 90Sr ingestion occurred during the woman's reproductive age, the transfer to fetus was equal to 0.21-0.26.

Published
1998

50. Preliminary uncertainty analysis for the doses estimated using the Techa River dosimetry system -- 2000

Author

Anspaugh, L. R., Tolstykh, E. I., Shagina, N. B., Napier, B. A., Degteva, M. O., and Vorobiova, M. I.

Subjects
RADIATION exposure, DRUG dosage, ENVIRONMENTAL impact analysis, RADIOACTIVITY, STATISTICS
Abstract

The Mayak Production Association (MPA) was the first facility in theformer Soviet Union for the production of plutonium. As a result of failures in the technological processes in the late 1940's and early 1950's, members of the public were exposed via discharge of about 1017 Bq of liquid wastes into the Techa River (1949-1956). Residents of many villages downstream on the Techa River were exposed via a variety of pathways; the more significant included drinking of water from the river and external gamma exposure due to proximity to sediments and shoreline. The specific aim of this project is to enhance the reconstruction of external and internal radiation doses for individuals in the Extended Techa River Cohort. The purpose of this paper is to present the approaches being used to evaluate the uncertaintyin the calculated individual doses and to provide example and representative results of the uncertainty analyses. The magnitude of the uncertainties varies depending on location and time of individual exposure, but the results from reference-individual calculations indicate that for external doses, the range of uncertainty is about a factor of four to five. For internal doses, the range of uncertainty depends on village of residence, which is actually a surrogate for source of drinking water. For villages with single sources of drinking water (river or well), the ratio of the 97.5 th percentile-to 2.5 th percentile estimates can be a factor of 20 to 30. For villages with mixed sources of drinking water (river and well), the ratio of the range can be over two orders of magnitude. [ABSTRACT FROM AUTHOR]

Published
2001

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