Abstract
A field international intercomparison measurement of soil-gas radon (222Rn) concentration was organised during the 3rd International Workshop on the Geological Aspects of Radon Risk Mapping (Prague, Czech Republic, September 1996). Participants representing 10 organisations from 8 countries took part in the intercomparison. The ratios of the standard deviation to the arithmetic mean (SD/mean) were used to describe the 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 greater than differences given by the uncertainty of primary calibration.
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