Calibration of Thermoluminescent Dosimeters for Use in Photon Radiation Beams of Various Quality

Abstract

Purpose: To describe the technology of dosimetric preparation of the same batch of TLD based on LiF activated by magnesium Mg and titanium Ti (LiF:Mg-Ti) for three qualities of photon radiation beams with energies of 1.25 MeV, 2 MeV and 192Ir beam with energy of 0.38 MeV for measurements during radiotherapy. The TLD calibration technology for 192Ir should be developed from scratch. To compare the energy dependences of the sensitivity coefficients for different qualities of the beams. Material and methods: 175 dosimeters were irradiated in photon radiation beams with al energy of 2 MeV, 1.25 MeV and 0.38 MeV in a reproducible geometry several times determined by the same dose. Individual coefficients are obtained. A working batch of 12 TLD was selected with a production capacity of 2 %. Coefficients are estimated for the batch and graphs of the energy dependence of individual sensitivity coefficients are constructed. Results: The results obtained indicate the presence of an energy dependence of the individual sensitivity coefficients of TLD in the energy range from 0.38 to 1.0 MeV.