A test of CsI(Tl) crystal for the dark matter search

In this paper, we show that low energy gamma rays down to few keV can be de tected with CsI(Tl) crystal detector. A clear peak at 6 keV from a radioact ive source is observed. In addition, we also show that alpha particles and gamma rays can be separated greater than 3 sigma level down to 50 keV regio n using the different time characteristics of the crystal for both signals. With further background study, we should be able to determine CsI(Tl) be a good candidate detector in search for weakly interacting massive particles (WIMPs).