| Abstrakt: |
The radioecological situation at the site of the peaceful underground nuclear explosion "Crystal" after removal land cover and installation of the artificial cover of rock from nearby quarry above the epicenter is considered. In 2012 the ambient dose equivalent rate of gamma radiation varied from 0.04 to 0.066 µSv/h, in 2019 the content of radionuclides in soils was (Bq/kg): 90Sr 2.5–5.3, 239,240Pu 0.03–25.4, 137Cs <2.0. In 2018–2020 the activity of radionuclides in surface water was (Bq/dm3): in drains from under the artificial cover 3H 4–12, 90Sr 0.004–0.4, 239,240Pu < 10–6, in local river water 3H 4–10.2, 90Sr 0.004–0.3. At present, the impact of surface drains from the "Crystal" site on the river network is assessed as insignificant. No more than 1/3 of 3H in the local river water comes with precipitation, and the rest of 3H comes from the "Crystal" explosion zone, mainly by an underground route. At least 91–96% of 90Sr in the local river water is due to the "Crystal" explosion: part of it comes from the explosion zone by an underground route, part is washed off from the surface of landscapes. [ABSTRACT FROM AUTHOR] |
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