Scintillation Properties of CsI(CO3) and CsI(Na) Crystals for Gamma Ray Detection
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Abstract
The scintillation response of CsI(CO3) and CsI(Na) crystals with the same size of ∅10 mm X 10mm were studied for γ-ray energies ranging from 16.6 keV to 1274.5 keV. The light yield non-proportionalityand the energy resolution were measured with an XP5200 PMT. Both crystals showed a commonlight yield non-proportionality with yielding energy resolution of 9.4 ± 0.5% and 9.9 ± 0.5% at 662 keVγ-rays respectively, for CsI(CO3) and CsI(Na). The step-like curves of energy resolution with a semiplateauin the energy range between 100 and 300 keV have been observed for both crystals. The intrinsicresolution of the crystals versus energy of gamma rays has been determined after correcting the measuredresolution for photomultiplier tube statistics. The overall and intrinsic energy resolutions are discussed.
Keywords : Scintillators / CsI(CO3) / CsI(Na) / Non-proportionality of Light Yield /Energy Resolution / Intrinsic Resolution* Corresponding