Ecological and Radiological Situation in the Stavropol Territory
2020
Abstracts of The Second Eurasian RISK-2020 Conference and Symposium
unpublished
The average effective radiation doses for the population of the Stavropol Territory do not differ significantly from the average radiation levels for population produced by natural, medical and technogenic ionizing radiation sources (IRS), as well as global fallout registered over the past 5 years. Dynamics of these indicators shows no significant changes in the recent years. The results of radiation-hygienic certification indicate that doses from natural (93.53%) and medical (6.37%) sources
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... e the lead in the structure of collective radiation doses for population of the Stavropol Territory. There are no zones of global radiation pollution (of technogenic nature as a result of radiation accidents) in the Stavropol Territory. No local pollution sites have been registered in recent years. However, radiological studies in the open areas of the Predgorny district show natural radiation anomalies associated with uranium ore occurrences, as well as technogenic radioactive contamination sites (RCS) of the past years due to the activities of uranium ore mining enterprise. Scientific Production Association "Almaz" (Lermontov) has stopped mining and processing uranium ore, but the rehabilitation of contaminated areas after its activities is not completed yet. As a part of socio-hygienic monitoring, radiation safety was controlled based on gamma radiation dose rates in open areas, determination of total alpha and beta activity in drinking water, determination of technogenic radionuclides in food, soil and open water bodies. Proportion of water samples exceeding the control levels for total alpha-beta activity and (or) intervention levels (IL) of individual radionuclides is less than 2%. Fluctuations of total alpha activity in underground water sources were noted as seasonal variations. Radiation doses for the population due to consumption of drinking water do not exceed 0.1 mSv/year. Natural ionizing radiation sources are leading radiation factors for the population of the Stavropol Territory. The contribution of natural ionizing radiation sources to collective radiation dose makes 91.65%. Based on data from radiation-hygienic certification and Unified Control System for Individual Radiation Doses (UCSID) it was found that the average individual annual dose in the Territory, taking into account the effects of all sources, was 3.01 mSv/year, of which 2.64 mSv/year came from natural ionizing radiation sources. Radiation dose rates for population vary within the levels registered during long-term observations in the region. According to radiation-hygienic monitoring data, external radiation dose rates in open areas were from 0.09 to 0.21 mSv/year, which corresponds to background values in the Territory. In order to assess the sanitary and epidemiological situation at high-risk facilities, annual laboratory tests were organized to check radiation safety indicators of soil at the monitored points. Analysis of the annual radiation-hygienic certification results for the Stavropol Territory and maintenance of the regional database of radiation doses for population allows objectively assessing the contribution of natural ionizing radiation sources to formation of collective radiation doses. Uneven content of natural uranium-thorium radionuclides in the underlying soils forms radon-hazardous sites and zones. It should be noted that all radon-hazardous sites are located in the Caucasian Mineral Waters area and are local. This area belongs to regions with increased radiation doses
doi:10.21467/abstracts.93.84
fatcat:yuf6yaxlpjcctlxwsnsc7eczxe