Search - Number 13 - CONTROL OF RELEASES OF RADIOACTIVE AEROSOLS FROM OBJECT “UKRYTTYA” IN 2009

CONTROL OF RELEASES OF RADIOACTIVE AEROSOLS FROM OBJECT “UKRYTTYA” IN 2009
Cover not present CONTROL OF RELEASES OF RADIOACTIVE AEROSOLS  FROM OBJECT “UKRYTTYA” IN 2009
Category: Number 13
Publication: 13
Summary

The maximal rate of unorganized releases of beta-radiating products of Chernobyl accident from object "Ukryttya" in 2009 was in autumn and winter period, and reached 2.5 MBq/m3. The concentration of long-lived beta-radiating aerosols released in atmosphere from system "Bypass" was within the range 1 - 10 Bq/m3. Them carriers were particles with active median aerodynamic diameter (AMAD) 2 - 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 dispersity of aerosols in releases from object "Ukryttya" remain constant the last five years. The change of air temperature at 1 ?С 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, flow speed.