Avaliação de dosímetros termoluminescentes para uso em radioterapia com fótons de alta energia

摘要: Currently the majority of radiotherapy treatments are done by irradiation with high energy photon beams. These beams emitted radioactive sources (of nuclides such as cobalt 60) or generated in electron linear accelerators. For dosimetric measurements on these beams, one most used techniques is thermoluminescence (TL). correct use thermoluminescent dosimeters (TLDs), it necessary to know their properties like, for example, variation response radiation beam. The purpose this study was assess various TL materials when irradiated So, curves relating and absorbed dose water were obtained LiF:Mg, Ti (TLD-100), Brazilian natural fluorite, CaSO4:Dy, Mg2SiO4:Tb Al2O3:C TLDs gamma rays from a Co source accelerator X ray nominal accelerating potential 6, 10, 15 18 MV. range similar that standard fractionated results show under conditions, there no larger than 3% function energy. relationship between deposition TLD studied Monte Carlo method (MC), using PENELOPE code system, consistent experimental outcomes. also thermal epithermal neutrons proved be sensitive them. However, consistency MC (which did not take into account presence neutrons), relative sensitivity beam energy, glow curve shape analysis lead conclusion influence due neutron contamination therapeutic negligible all materials. indicate doses energies routinely radiotherapy, can without applying any correction factors