Geosystem pollution by radioactive strontium near a regional radioactive waste repository |
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| Authors: | G V Lavrentyeva I I Silin B I Synzynys |
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| Institution: | 1.Obninsk Institute for Nuclear Power Engineering,Branch of Moscow Engineering and Physics Institute (MIFI),Obninsk,Russia;2.Institute of Mineralogy, Geochemistry, and Crystal Chemistry of Rare Elements,Moscow,Russia;3.Bauman Moscow State Technical University, Kaluga Branch,Kaluga,Russia |
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| Abstract: | Radioecological studies were carried out in a territory polluted by 90Sr delivered by groundwater after leakage from a tank in a near-surface radioactive waste repository. The layer-by-layer vertical distribution of 90Sr in soil down to 3 m is analyzed. The area of radioactive pollution above the minimal significant activity level (1 Bq/kg by NRB-99/2009) in the examined soil layers decrease with depth as follows: 1808 m2 at 0–5 cm, 302 m2 at 5–10 cm, and 181 m2 at 10–15 cm. The accumulation of 90Sr takes place at a natural sorption geochemical barrier—a swampy area in a near-terrace depression. The radiation dozes were calculated for terrestrial mollusk of Bradybaena fruticum, accumulating strontium in its shell; the doses are in excess of the screening value of 2.4 μGr/day in 41% of the territory. This is higher than the acceptable risk level (5%) for this mollusk population. An excess of the intervention level for 90Sr was recorded in both subsurface and surface waters in this geosystem during winter and summer dry seasons and autumn showers. |
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