Intercomparison of TL dosimetry (DIMOND programme)

During DIMOND CA, a thermoluminescence dosimetry intercomparison has been performed, in order to ensure that all participants measure the same dose. After the calibrating and annealing procedures, 50 TLD pellets (in groups of five) of each participating country were sent to the coordinator to be irradiated with 'unknown' radiations (blind test). The irradiation conditions (8 different set-ups. one for each group of pellets per participant) were (i) one gamma irradiation (Co-60), at air kerma in the range of 0.3 to 50.0 mGy, (ii) seven X ray irradiations, at air kerma in the range of 0.3 to 50.0 mGy, with tube potential in the range of 40 to 150 kV and a variety of filter combinations. Ten pellets (two groups) were used for background and transport dose evaluation. After measuring the TLDs, the participants sent the results to the coordinator for intercomparison. Irradiating set-up conditions, evaluated doses, as well as comparison of mean values with the 'true' nominal doses are presented and discussed.