Development of 8×8 CsI(Tl) Array Detector

The principle and structure of a 8×8 CsI(Tl) array detector were described in this paper. For each unit, there are a CsI(Tl) crystal, an optical conductor and a photoelectric multiplier tube. The length of CsI(Tl) crystal is about 50 mm with a 21 mm×21 mm front surface and a 23.1 mm×23.1 mm back surface. The energy resolution is 2.7% for 30 MeV proton and 1.5% for 170 MeV ⁷Be, which was tested on the RIBLL (Radioactive Ion Beam Line in Lanzhou). It can be used to identify the charged particles in the nuclear experiments induced by the radioactive beam.