Report on the first phase activity of an EU project concerning coordinated radon measurements in five European countries

In 1994, a research project on radon was initiated with the participation of five European countries. The aim of the project was to carry out a comparison experimental survey on six different sites, located in the Lund-Kiel-Leipzig-Montpellier-Barcelona-Roma areas. This paper reports on: 1) quality assurance in measuring techniques with application to standardization and calibration facilities of the participating countries; and, 2) standardized measuring methods and measurement protocols of indoor radon levels, soil gas radon levels, and weather parameters. In addition, some results obtained from a first survey with active and passive detectors are presented. No clear correlations between indoor radon levels, soil radon levels, and environmental parameters were found.