Concentrations of 222Rn and 220Rn in Indoor Air

摘要

Radon(222Rn)and thoron(220Rn)were surveyed in indoor air of 15 public buildings and 10 homes in Slovenia in November 2004 by exposing Rn-Tn discriminative etched track detectors.The following ranges of the activity concentration were obtained for public buildings:98-2680 Bq m~(-3)for C_(Rn),19-1330 Bq m~(-3)for C_(Tn)and 0.11-0.72 for the C_(Tn)/C_(Rn)ratio.In homes,the C_(Rn)range was 12-374 Bq m~(-3)and all C_(Tn)values,except one of 29 Bq m~(-3),were below the detection limit of 10 Bq m~(-3).Monthly effective doses in public buildings due to Rn(E_(Rn))and Tn(E_(Tn))were in the ranges 0.05-1.45 mSv and 0.01-0.47 mSv,respectively,and in homes,0.018-0.548 and 0.009-0.095 mSv,respectively.The E_(Tn)/E_(Rn)ratio in public buildings was in the range 0.07-0.47.