A pilot study of indoor thoron and ²¹²Pb concentrations in residential buildings in Ekaterinburg, Russia.

A pilot study of the concentrations of thoron and ²¹²Pb in the air of residential premises in Ekaterinburg was carried out. The arithmetic mean of thoron concentration in the center of the room was 35.7, near the wall 85.2 Bq m⁻³ respectively. For rooms in the buildings constructed with monolithic and aerated concrete, the average concentration of thoron was 73 ± 17 Bq m⁻³, brick—19 ± 5 Bq m⁻³, concrete panels—16 ± 6 Bq m⁻³. Simultaneous measurements of the ²¹²Pb and radon concentrations during 3–5 days in combination with long-term measurements of radon concentration allows to estimate the long-term concentration of ²¹²Pb with an uncertainty ~ 25%. [ABSTRACT FROM AUTHOR]

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