Scintillation Properties of CsI(CO3) and CsI(Na) Crystals for Gamma Ray Detection

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Weerapong Chewpraditkul
King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140
Chalerm Wanarak
King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140
Lukasz Swiderski
Soltan Institute for Nuclear Studies, PL05-400 Swierk-Otwock, Poland
Marek Moszynski
Soltan Institute for Nuclear Studies, PL05-400 Swierk-Otwock, Poland

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

 

 

Article Details

Issue
Vol. 31 No. 2 (2008): April - June
Section
Original Articles
Author Biographies

Weerapong Chewpraditkul, King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140

Associate Professor, Department of Physics, Faculty of Science.

Chalerm Wanarak, King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140

Research Assistant, Department of Physics, Faculty of Science.

Lukasz Swiderski, Soltan Institute for Nuclear Studies, PL05-400 Swierk-Otwock, Poland

Researcher, Department of Nuclear Radiation Detector and Electronics.

Marek Moszynski, Soltan Institute for Nuclear Studies, PL05-400 Swierk-Otwock, Poland

Professor, Department of Nuclear Radiation Detector and Electronics.