Searches for weakly interacting massive particles(WIMP) can be based on the detection of nuclear recoil energy in CsI(Tℓ) crystals. We demonstrate that low energy gamma rays down to few keV is detected with CsI(T ℓ) crystal detector. A clear peak at 6 keV is observed using X-ray source. Good energy resolution and linearity have been achieved down to X-ray region. In addition, we also show that alpha particles and gamma rays can be clearly separated using the different time characteristics of the crystal.
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