Speaker
Description
The availability of proton and ion beam therapy is increasing every year. A precise radio oncological treatment demands the knowledge of the dose distribution in human tissue. Energetic hadrons interact with tissue and generate prompt gamma rays with energies of up to 10 MeV. The prompt photons provide information about the hadron beam exposure. We investigated the usage of resistive plate chamber (RPC) detectors for such an application. The detection prompt photon efficiency of the RPC has been simulated. We found a value of 2% per gas gap. Two multi-gap RPCs with different electrodes (soda limed glass and Si3N4/SiC) have been tested in a Bremsstrahlung beam generated with 13 MeV electrons delivered by the ELBE accelerator at the Helmholtz-Center Dresden-Rossendorf (HZDR), thus approaching therapy conditions. A LaBr-scintillation counter monitored the photon rate. First results of the RPC efficiency and time resolution in dependence on the photon flux will be presented.
