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Publication . Article . 2018

ASSESSMENT OF POTENTIAL RADIATION HAZARD OF THE FORMER URANIUM FACILITIES FOR THE POPULATION OF THE ISTIKLOL CITY OF THE REPUBLIC OF TADZHIKISTAN

Kh. M. Nazarov; K. A. Ermatov; D. A. Salomov; S. M. Bahronov; U. M. Mirsaidov;
Open Access
English
Published: 12 Jul 2018 Journal: Radiacionnaâ Gigiena, volume 11, issue 2, pages 83-90
Publisher: Saint-Petersburg Research Institute of Radiation Hygiene after Professor P.V. Ramzaev
Abstract
The article presents the results of alpha, gamma spectrometric analyzes of samples, dosimetry, radon monitoring of the estimated areas in the Istiklol city. It has been established that the specific activity of radionuclides for uranium and radium in the tailing materials are in the range: 1405 – 2140, 5935 – 9843 Bq / kg, respectively. Based on the results of the monitoring of gamma radiation and radon volume activity at Istiklol city sites, it has been established that gamma radiation ambient equivalent dose rate varies from 0.52 to 1.78 μSv / h, and radon volume activity in air ranges from 20 and 45 Bq / m3. It is shown that the radon concentration in the air above the surface of tailings is not high. However, the exhalation of radon from the soil surface of all the tailings dumps examined is above the standard (1 Bq / (m2·s). The results of measurements of radon volume activity in the air of residential buildings and facilities located on the territory of Istiklol city have shown that the value of radon volume activity is within the limits of 44 – 195 Bq / m3. A high value of radon volume activity is noted in the former dilapidated plant (1319 Bq / m3). Gamma and alpha spectrometric studies revealed that the average values of the activity concentration of uranium and radium in the soils for tailings and the pit are for 234U – 65365 Bq / kg, for 238U – 50295 Bq / kg, and for 226Ra – 3800 Bq / kg. To estimate the doses of population irradiation via the water pathway were taken the average values of the volumetric activity of 234U, 238U, 226Ra in the waters. Maximum values of volumetric activity of radionuclides were observed in samples of drainage water, Bq / m3: 234U – 530000, 238U – 390000, 226Ra – 185. To calculate the contributions of various radiation factors to an additional annual dose of irradiation, the population was divided into four hypothetical groups. The time duration of stay of various hypothetical population groups in the areas of potential irradiation, radiation dose due to water use from contaminated water sources and additional factors in Istiklol were taken into account.The main contributor to the additional radiation dose received by hypothetical population groups is external irradiation during the stay on the territory of the FBR and tailing dumps, and internal irradiation due to the use of contaminated water.
Subjects by Vocabulary

Microsoft Academic Graph classification: Equivalent dose Environmental chemistry Uranium chemistry.chemical_element chemistry Environmental science Tailings Radionuclide Radon Population education.field_of_study education Dosimetry Radium

Subjects

analysis, radionuclide, uranium, radium, radon, volumetric activity, gamma radiation, air, soil, tailings, radiometer, dose estimation, Medical physics. Medical radiology. Nuclear medicine, R895-920, Radioactivity and radioactive substances, QC794.95-798, Radiology, Nuclear Medicine and imaging

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