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Radiochemistry

, Volume 61, Issue 1, pp 109–117 | Cite as

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

  • B. I. Ogorodnikov
  • V. E. KhanEmail author
Article

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.

Keywords

Chernobyl accident radioactive aerosols radon-220 lead-212 volume activity aerosol dispersity exposure dose 

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Copyright information

© Pleiades Publishing, Inc. 2019

Authors and Affiliations

  1. 1.Karpov Research Institute of Physical ChemistryMoscowRussia
  2. 2.Institute of NPP Safety ProblemsNational Academy of Sciences of UkraineChernobyl, Kyiv oblastUkraine

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