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The given work considers the accumulation levels of technogenic radionuclides by some components of the river Yenisei near the discharge area of the water containing a big number of technogenic radionuclides, this water being discharged from the Mining and Chemical Combine (MCC). The investigation was carried out during the operation of the nuclear reactor included into the facility of the given enterprise (2006-2009). The content of gamma-emitting technogenic and natural radionuclides was measured. Using the method of gamma spectrometry, a considerable amount of technogenic radionuclides of the activation type (24Na – up to 1950 Bq·kg-1,51Cr – up to 2860 Bq·kg-1) were detected in biological objects. Making some assumptions in calculating the dose rate, for the organisms under study the following largest doses were revealed (μGy·day-1): aquatic plants – up to 39, fish: grayling 22,3 and pike 36,4. These values are considerably lower than the accepted radiation dose for aquatic biota which amounts to 10 mGy·day-1. Key-Words: Rivers, hydrobionts, dose rate, technogenic radionuclides. Received: January 28, 2020. Revised: May 22, 2020. Re-revised: June 1, 2020. Accepted: June 3, 2020 Published: June 12, 2020

wseas transactions on environment and development

Calculation of the Radiation Dose for Some Hydrobionts of the River Yenisei During the Operation of the Nuclear Fuel Cycle Enterprise - Mining and Chemical Combine, Krasnoyarsk