Search - Number 19 - CONTROL OF RELEASES OF RADIOACTIVE AEROSOLS FROM OBJECT “UKRYTTYA” IN 2011

CONTROL OF RELEASES OF RADIOACTIVE AEROSOLS FROM OBJECT “UKRYTTYA” IN 2011
Cover not present CONTROL OF RELEASES OF RADIOACTIVE AEROSOLS FROM OBJECT “UKRYTTYA” IN 2011
Category: Number 19
Publication: 19
Summary

The results of control of radioactive particulate emission are presented from the object "Ukryttya" in 2011. The maximal rate of unorganized releases of beta-radiating products of Chernobyl accident was in winter period, and reached 6 MBq/day. The concentration of long-lived beta-radiating aerosols released in atmosphere from system "Bypass" was within the range 1 - 10 Bq/m3 (maximal concentration was 45 Bq/m3). Them carriers were particles with active median aerodynamic diameter (AMAD) 1- 5 µm. The concentration of 212Pb - daughter products of thoron consisted as a rule 1 - 5 Bq/m3. They have AMAD 0.05 - 0.3 µm. A volume activity and dis-persity of aerosols in releases from object "Ukryttya" remain constant the last eight years. It was confirmd that the change of air temperature at 1С results in the change of speed flow in the system "Bypass" near 0.1 m/s.

Keywords: object "Ukryttya", aerosols, volumetric activity, activity median aerodynamic diameter.

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