The first long time comparison of techniques for passive integrated measurement of radon and radon daughter concentration performed in an occupied dwelling.

The accuracy and variance of passive integrating detectors for radon and radon daughters presently in use in Sweden have been studied. Sets of 10 of each participating detector were exposed in an occupied dwelling. The results were compared with accurate measurements made with instruments from the National Swedish Institute of Radiation Protection. The results from the first test, in the summer of 1983, became an incitement to improved calibration procedures for some of the participating detectors. The test was repeated in February - April 1984. The results showed that all detectors participating in the test and presently in general use in Sweden are reasonably accurate.