Development of a three layer Compton telescope prototype based on continuous LaBr3 crystals and Silicon Photomultipliers

A three layer Compton telescope for dose monitoring in hadron therapy is under development at IFIC - Valencia. It will consist of three detector layers and each layer will be made of a continuous LaBr₃ crystal coupled to four Silicon Photomultiplier (SiPM) arrays. A prototype made of two detector layers has already been assembled and tested. The detector layers consist of a 32×36×5 mm³ and 32×36×10 mm³ LaBr₃ crystal, each coupled to four SiPM arrays. The front-end electronics of each detector is based on the VATA64HDR16 application specific integrated circuit (ASIC). The gamma rays coming from a ²²Na source have been detected with the two detector layers working in time coincidence, allowing energy and position estimation.