Two-dimension positional sensitive CsI(Tl) detector

the two-dimension positional sensitive csl (ti) detector is reported. the detector' s spatial resolution is 0. 81 mm (fwhm) and energy resolution is 0.9% (fwhm). this detector is the part of the delta e- e telescope which is used on ribll. the light output is not linear with the energy loss. we carried out the energy calibration of the, csl( ti) detector by magnetic rigidity of ions and energy loss on si detector which we know.