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The inorganic CsI(Tl) crystal scintillator is a candidate served as ananti-compton detector for China Dark matter EXperiment (CDEX). Studying theintrinsic radiopurity of CsI(Tl) crystal is an issue of major importance. Thetiming, energy and spatial correlations, as well as the capability of pulseshape discrimination provide powerful methods for the measurement of intrinsicradiopurities. The experimental design, detector performance andevent-selection algorithms are described. A total of 359*3 kg-days data fromthree prototypes of CsI(Tl) crystals were taken at China Jinping undergroundlaboratory where offers a good shielding environment. The contamination levelsof internal isotopes from Cs-137, Th-232 and U-238 series, as well as the upperbounds of U-235 series are reported. Identification of the whole alpha8 peaksfrom U/Th decay chains and derivation of those corresponding quenching factorsare achieved.

Measurement of intrinsic radioactive backgrounds from Cs-137 and U/Th chains in CsI(Tl) crystals