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CERTAIN RESULTS OF RADIOECOLOGICAL STUDIES IN THE TERRITORY OF THE WATER SUPPLY SYSTEM UPGRADE IN DUDINKA
Abstract
Radiation factors in the areas of mineral deposit extraction are often rather intense, and they require a detailed study. One of such areas is the Taimyr Dolgan-Nenets District of the Krasnoyarsk Region, Russia, the administrative center of which is located in the town of Dudinka where at present the water supply system is being upgraded. This study is focused on investigation of the radiation factors on the territory under upgrade. In the framework of engineering and environmental surveys the gamma background and radon hazard have been studied in the areas for projected buildings with long term staff occupancy, and analyses have been made of water radioactivity and radioactivity of the soil and priming. The field measurements of the gamma background and radon hazard have shown that the equivalent dose rate (EDR) of the external gamma radiation varies in the range from 0.10 to 0.15 ?Sv/hour, while the radon flow density from the ground surface fluctuates from 15 to 35 mBq?m-2?s-1. The laboratory water analyses from the Lake Samsonkino (water supply source of Dudinka) have made it possible to determine that the total alpha and beta radioactivity are equal to 0.01 and 0.03 Bq/dm3 respectively. The soil and priming samples are characterized by low activity of technogenic Cs137, which does not exceed 6 Bq/kg, and effective specific activity of natural radioactive nuclides (K40, Ra226, Th232) varying within the range from 15.4 to 22.5 Bq/kg. It has been determined that according to cumulative sanitary standards? criteria, the radiological state of the territory is estimated as favorable, and water from the Lake Samsonkino is serviceable enough for domestic water supply and it meets all the requirements for Category 1 water supply. In addition, the results obtained demonstrate the absence of radiation hazard sources in the area under study.
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