SCIENTIFIC AND INFORMATION-ANALYTICAL MAGAZINE

ISSN 1024-6177 (Print), ISSN 2618-9615 (Online)

Medical Radiology and Radiation Safety. 2015. Vol. 60. No. 4. P. 36-42

RADIATION SAFETY

A.L. Polyudin, R.I. Yusupov

Investigation of Radioactive Gas-Dynamic Factors in the Trials of Russian Federal Nuclear Center VNIIEF

E.I. Zababakhin Russian Federal Nuclear Center - Russia Research Institute of Technical Physics, Snezhinsk, Russia, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

ABSTRACT

Purpose: The study of the redistribution of uranium during the one-time decentralized emissions.

Material and methods: Were sampled aerosol aspiration and sedimentation processes. Selected soil at a distance of 250 m from the emission points and laid soil profiles, taking into account the elementary geochemical landscapes. In a sample of uranium samples were determined standard spectrophotometric method using tributyl phosphate and arsenazo III.

Result: The average uranium content in the air since the protective buildings decentralized single peak changes from 0.40 to 1.56 Bq/m3. The estimated dose was in the range of from 2,11×10-6 to 5,91×10-5 mSv. Investigation showed fractional aerosol distribution of particles up to 2 mm is not more than 46 %. The uranium content in the five-centimeter top layer of soil is in the range of from 32 to 151 mg/kg. The content of uranium in soil profiles pledged not exceed 360 mg/kg.

Conclusion: 1. The average uranium content in the air since the protective buildings experiment varies from 0.40 to 1.84 Bq/m3. The average uranium content in the air pilot fields varies from 0.15 to 1.77 Bq/m3. The estimated dose is not more than 5,91×10-5 mSv. Up to half of aerosols deposited at a distance of 10 km from the point of a single decentralized output. Fraction of particles that determine the primary effects of exposure (ie up to 2 microns) reaches 45.7 %. 2. The uranium content in the studied soils from 6 to 15 times greater than the maximum recorded natural uranium content. Maximum rates of uranium in soils experimental field associated with the presence of peat horizons, as well as high rates of soil density. Proportion of watersoluble forms of uranium reaches 1 %, and the mobile — 91 %. 3. Uranium in the upper soil horizons superaqual and subaqueous position is concentrated in the most mobile form (exchange or mobile) associated with the salts of sodium, potassium, calcium and soluble carbonates. In soils superaqual position uranium increasingly. In soils of eluvial position associated with uranium sesquioxide. Up to 95 % of the uranium in the future is likely to be redistributed into the underlying soil horizon.

Key words: long-lived radionuclides, uranium, forms of occurrence, soil emissions

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For citation: Polyudin AL, Yusupov RI. Investigation of Radioactive Gas-Dynamic Factors in the Trials of Russian Federal Nuclear Center VNIIEF. Medical Radiology and Radiation Safety. 2015;60(4):36-42. Russian.

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