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6th International Conference on New Developments in Photodetection (NDIP 2011), Lyon : France (2011)
Detector characterization and first coincidence tests of a Compton telescope based on LaBr3 crystals and SiPMs
G. Llosá1, J. Barrio1, J. Cabello1, A. Crespo1, C. Lacasta1, M. Rafecas1, S. Callier2, C. De La Taille2, L. Raux2

A Compton telescope for dose monitoring in hadron therapy consisting of several layers of continuous LaBr3 crystals coupled to silicon photomultiplier (SiPM) arrays is under development within the ENVISION project. In order to test the possibility of employing such detectors for the telescope, a detector head consisting of a continuous 16 mm×18 mm×5 mm LaBr3 crystal coupled to a SiPM array has been assembled and characterized, employing the SPIROC1 ASIC as readout electronics. The best energy resolution obtained at 511 keV is 6.5% FWHM and the timing resolution is 3.1 ns FWHM. A position determination method for continuous crystals is being tested, with promising results. In addition, the detector has been operated in time coincidence with a second detector layer, to determine the coincidence capabilities of the system. The first tests are satisfactory, and encourage the development of larger detectors that will compose the telescope prototype.
1 :  IFIC - Instituto de Fisica Corpuscular
2 :  LAL - Laboratoire de l'Accélérateur Linéaire
Physique/Physique/Instrumentations et Détecteurs

Sciences de l'ingénieur/Micro et nanotechnologies/Microélectronique
Hadron therapy – Compton imaging – LaBr3 – Continuous crystal – SiPM – MPPC – G-APD