INTERNATIONAL INTERCOMPARISON OF SOLID-STATE DOSIMETERS WITHIN ENVIRONMENTAL MONITORING

An international intercomparison study was carried out to optimise the readout procedures of the dosimetry systems used in the corresponding national environmental dosimetry laboratories. The intercomparison wa s based on the joint cross-calibration in the laboratories involved an d an exchange of dosemeters within the respective national environment monitoring programmes. The aims of the study were the intercomparison of field irradiations at three exposure sites in each of the three pa rticipating countries, the determination of the actual field fading co rrection factor and the contribution of (national and international) t ransit doses. Six dosimetry systems have been employed in five measure ment cycles using thermoluminescent LiF:Mg,Ti, CaF2:Mn, and CaSO4:Dy, as well as photoluminescent flat glass dosemeters. Within the uncertai nty of measurement the results indicate no seasonal influence on the n atural background level at any location, as well as no improvement in results by using fading corrections.