Large-area segmented polycrystalline cvd diamond for dose mapping in advanced radiotherapy techniques

Diamond has a potential for dosimetry in advanced radiotherapy techniques, being a solid-state nearly tissue equivalent material, with the possibility to be grown in large diameter wafers by Chemical Vapour Deposition (CVD). A largearea bidimensional dosimeter made of up to two detector-grade adjacent 2.5×2.5cm2 polycrystalline Chemical Vapour Deposited (pCVD) diamond samples, each equipped with a 12×12 matrix of contacts and connected to a custom-made electronic read-out system, has been manufactured in view to achieve fast dynamics as well as spatial and time resolutions required in advanced radiotherapic techniques, such as Volumetric Modulated Arc Therapy (VMAT). The device has been used to extract a 2D map of a VMAT lung plan, showing promising performances.