Non-proportionality study of CaMoO4 and GAGG:Ce scintillation crystals using Compton coincidence technique. (September 2016)

• Record Type: Journal Article
• Authors: Kaewkhao, J.; Limkitjaroenporn, P.; Chaiphaksa, W.; Kim, H.J.
• Is Part Of: Applied radiation and isotopes. Volume 115(2016:Sep.)
• Page Start: 221
• Page End: 226
• Publication Date: 2016-09
• Subjects: Scintillation crystals -- Non-proportionality -- Compton coincidence technique; Radiology -- Periodicals; Radiation -- Industrial applications -- Periodicals; Nuclear chemistry -- Periodicals; Internet resource; Periodical; 660.298
• DOI: 10.1016/j.apradiso.2016.06.030
• Languages: English
• ISSNs: 0969-8043

Abstract

Abstract: In this study, the CCT technique and nuclear instrument module (NIM) setup for the measurements of coincidence electron energy spectra of calcium molybdate (CaMoO4 ) and cerium doped gadolinium aluminium gallium garnet (Gd3 Al2 Ga3 O12 :Ce or GAGG:Ce) scintillation crystals were carried out. The 137 Cs irradiated gamma rays with an energy (Eγ ) of 662 keV was used as a radioactive source. The coincidence electron energy spectra were recorded at seven scattering angles of 30°–120°. It was found that seven corresponding electron energies were in the range of 100.5–435.4 keV. The results show that, for all electron energies, the electron energy peaks of CaMoO4 crystal yielded higher number of counts than those of GAGG:Ce crystal. The electron energy resolution, the light yield and non-proportionality were also determined. It was found that the energy resolutions are inverse proportional to the square root of electron energy for both crystals. Furthermore, the results show that the light yield of GAGG:Ce crystal is much higher than that of CaMoO4 crystal. It was also found that both CaMoO4 and GAGG:Ce crystals demonstrated good proportional property in the electron energy range of 260–435.4 keV. Graphical abstract: Highlights: The electron response of CMO and GAGG:Ce crystals were studied using Compton coincident technique (CCT). CMO and GAGG:Ce were primary detectors and NaI(Tl) was secondary detector. The electron energy resolutions are inverse proportional to the square root of energy. The electron energy resolution of GAGG:Ce better than CMO. At the energy range from 100.5–435.4 keV, the electron response was slightly decreased at approximately 5% for both crystals.