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212Pb-Bearing Aerosols in Subreactor Rooms of the Chernobyl NPP Shelter

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Radiochemistry Aims and scope

Abstract

The results of five-year studies in Shelter subreactor rooms are summarized. At height elevations from 0 to 12 m, the mean volume activity (VA) of 212Pb-bearing aerosols is about 10 Bq m−3. The main source of 220Rn and of its daughter 212Pb is 232Th contained in the building structures. The maximal 212Pb VA is observed in the warm period of a year, and the minimal VA, in the cold period. In ventilation releases through the Bypass system, VA of 212Pb is 4–5 times lower than in subreactor room. The activity median aerodynamic diameter (AMAD) of 212Pb-bearing aerosols in most cases was within the range 0.06–0.4 µm. During works in subreactor space, the irradiation via 212Pb inhalation can amount to 3–5% of the annual effective dose limit (20 mSv) adopted in Ukraine.

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Authors and Affiliations

  1. Karpov Research Institute of Physical Chemistry, ul. Vorontsovo Pole 10, Moscow, 105064, Russia

    B. I. Ogorodnikov

  2. Institute of NPP Safety Problems, National Academy of Sciences of Ukraine, vul. Kirova 36a, Chernobyl, Kyiv oblast, 07270, Ukraine

    B. I. Ogorodnikov & V. E. Khan

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  1. B. I. Ogorodnikov
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  2. V. E. Khan
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Correspondence to V. E. Khan.

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† Deceased.

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Ogorodnikov, B.I., Khan, V.E. 212Pb-Bearing Aerosols in Subreactor Rooms of the Chernobyl NPP Shelter. Radiochemistry 61, 109–117 (2019). https://doi.org/10.1134/S1066362219010168

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  • DOI: https://doi.org/10.1134/S1066362219010168

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