GaN detector for protontherapy
Proton therapy is a proton-beam treatment technique for cancers, used to reduce side effects associated with radiotherapy. The aim of this project is to develop a GaN-based proton detector. The device features a direct-readout matrix, with a GaN active zone and a remote silicon readout circuit. Compared with ionization chambers, our approach offers the advantage of a microelectronic technology that is simple, inexpensive, works at low voltage, and has good spatial resolution given by the size of the pixels. Compared with scintillators, our detectors offer better spatial resolution, linearity and dynamical range. Finally, silicon matrices would be ideal, but too fragile under irradiation by energetic protons. In collaboration with the Centre Antoine Lacassagne in Nice, we have already demonstrated sufficient sensitivity, excellent spatial resolution, imaging capability, flux linearity and initial flux resistance measurements.
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