INTERCOMPARISON MEASUREMENT OF SOIL-GAS RADON CONCENTRATION

A field international intercomparison measurement of soil-gas radon (R n-222) concentration was organised during the 3rd International Worksh op on the Geological Aspects of Radon Risk Mapping (Prague, Czech Repu blic, September 1996). Participants representing 10 organisations from 8 countries took part in the intercomparison. The ratios of the stand ard deviation to the arithmetic mean (SD/mean) were used to describe t he spread of intercomparison data and the agreement among participants . The intercomparison differences were about 20%. The analysis of data resulted in the conclusion that sampling errors were probably not gre ater than differences given by the uncertainty of primary calibration.