Suppression of Afterglow Effect in CsI(Tl) Scintillation Detector by Heat Treatment

For radiation detectors CsI(Tl) crystal is one of the most efficient inorganic scintillator which use for gamma measurement. However, CsI(Tl) has one large drawback for use in radiation survey meters because its afterglow effect. This effect manifests itself by the light pulse emitted even after the radiation source is removed. When this crystal is inserted into high dose rate field it cannot be used for photon detection due to the emission of these afterglow light pulses. Even when moving later to a low radiation field, the field cannot be measured due to these afterglow pulses. This delayed emission can cause pulse pileup in high count rate application, reconstruction artifacts in CT application, and reduced contrast and image blurring in high speed Xray imaging.This research was taken in order to study the effect of raising the temperature of the CsI(Tl) crystal at the afterglow effect. The main purpose of our study was to remove or shorten the duration of the afterglow effect in survey meters