INTERCOMPARISON OF RESPONSE CHARACTERISTICS OF 7 CR-39 MATERIALS DURING RADON CALIBRATION

Intercomparison of response is presented for seven different CR-39 pol ycarbonate materials. All the detector materials were exposed simultan eously to same radon gas inside a calibration chamber under standardiz ed conditions of temperature and relative humidity. Each type of CR-39 was identically developed in etching solution and read with a common system. The efficiencies of track registration were determined experim entally for each material together with background track densities. Th e etch pit diameter distributions were also determined. Differences in production procedures of the CR-39 make significant differences in re sponse to alpha radiation. It is very important to know the response o f each material in order to establish the normalization factors for ma king radon measurements.