Results of calibrations in β-radiation fields

In order to measure β-radiation fields for calibration purposes, an extrapolation chamber, a 'wall-less' chamber and 0.02 mm thick LiF teflon dosimeter were used. The measurements were carried out with a source arrangement free air (2 π geometry), for a narrowly defined radiation field and a bundled cone of rays at a distance of 0.1 to 100 cm from a 90Sr/90Y and 106Ru/106Rh source. The results are compared which in the immediate proximaty to the source gave good agreement between TLD and extrapolation chamber, at distances of 10-100 cm between TLD and the 'wall-less' ionization chamber. Furthermore, a report is given of the results which were obtained from self-readable pen dosimeters and LiF dosimeters. (orig./LH)