In the present study, the contemporary indoor radon activity concentration and the surface-deposited Po-210 activity were measured in 65 Romanian dwellings. The activity of trapped Po-210 on the glass surface was measured using the (CR-LR) difference technique. The retrospective radon activity concentration estimated on the basis of age-adjusted Po-210 activity was found to have a geometric mean of 318 Bq m(-3), being higher than the geometric mean (250 Bq m(-3)) of the contemporary indoor radon measurements, measured with two types of track detectors (RSKS and Radtrak(2)(R)). By applying Lin's concordance correlation coefficient, a substantial strength of agreement (r(C) = 0.94) was obtained between RSKS and Radtrak(2)(R) results, respectively a poor agreement (r(C) = 0.71) between the retrospective and contemporary methods. The ratio between contemporary and retrospective radon concentrations has a geometric mean of 0.8 and range from 0.2 to 3.9.
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