Gamma-ray imaging detectors based on SDDs coupled to scintillators

Silicon Drift Detectors (SDDs) have been recently employed succesfully in scintillation detection. Owing to the low value of output capacitance, a SDD is in fact characterized by a lower electronics noise with respect to a conventional silicon photodiode. This feature could allow a detector based on a CsI(Tl)-SDD assembly to reach high energy and position resolution in gamma detection. In this work, we present a small prototype of gamma detector for 2-D position measurements, based on a single scintillator coupled to an array of SDDs. The first experimental results are reported.