Behavior of CVD diamond-based TL dosimeters in radiotherapy environments using photon and electron beams from treatment accelerators

Chemical Vapor Deposited (CVD) diamond has great advantages for use as thermoluminescent dosimeters in radiotherapy environment because of the reproducible high quality and controlled doping. This study compares CVD diamond Thermally Stimulated Luminescence response to that of a classical ionization chamber. Clinicallyrelevant features like the depth-dose distributions as well as the absorbed dose profile are investigated for a 6 MV photon beam and a 6 MeV electron beam. Moreover electron beam cartography and one beam Intensity-Modulated Radiation Therapy (IMRT) treatment planning have been controlled by means of CVD diamonds. Reproducibility and repeatability of TL measurements are satisfying and a good TL sensitivity to both electron and photon beams is clearly shown. Comparing the TL responses presented here to the ionization chamber underline the very promising behavior of CVD diamonds, particularly in high dose gradient areas.