TYPE TESTING OF PERSONAL DOSIMETERS FOR PHOTON ENERGY AND ANGULAR RESPONSE

Performance criteria for personal dosemeters have been recently propos ed in the CEC document 'Technical Recommendations for Monitoring Indiv iduals Occupationally Exposed to External Radiation' (EUR 5287, Revise d). The current experiment was carried out to demonstrate that TLD-bas ed dosimetry systems can comply with these requirements. The emphasis of the experiment was on the dosemeter response as a function of photo n energy and angle of incidence of the radiation. The tests were based on the ICRU operational quantities H(p) (0.07) and H(p) (10). All mea surements were compared with the true dose in a 30 x 30 x 15 cm tissue -equivalent slab phantom, calculated using appropriate conversion coef ficients. For each combination of photon energy and angle, three dosem eters of each system were irradiated simultaneously on a 30 x 30 x 15 cm PMMA phantom. No corrections were made for possible - but unknown! - influence on the dosemeters from the difference in backscatter betwe en tissue-equivalent material and PMMA.