The introduction of NRS-99 has consolidated the need of controlling the equivalent equilibrium volume activity of thoron (EEVATn) and radon (EEVARn) in the air of dwelling, industrial, and public buildings. Analysis of more than 1000 values of EEVATn measured in parallel with EEVARn, which was based on the well-known mechanisms of accumulation of radon, thoron and their derivatives in the air of premises made it possible to approximate the correlation between EEVATn and radon EEVARn and to estimate the value of radon EEVATn without its measurement several hours after air sampling.
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