Timing characteristics of the scintillation response of Gd3Al2Ga3O12:Ce and Gd3Al2.6Ga2.4O12:Ce single crystal scintillators. (April 2016)

• Record Type: Journal Article
• Authors: Sakthong, Ongsa; Chewpraditkul, Weerapong; Kamada, Kei; Yoshikawa, Akira; Szczesniak, Tomasz; Grodzicka, Martyna; Sibczynski, Pawel; Moszynski, Marek
• Is Part Of: Radiation measurements. Volume 87(2016:Apr.)
• Page Start: 24
• Page End: 28
• Publication Date: 2016-04
• Subjects: Coincidence time resolution -- Energy resolution -- Gd3Al2.6Ga2.4O12:Ce -- Gd3Al2Ga3O12:Ce -- Scintillation decay; Nuclear emulsions -- Periodicals; Particle tracks (Nuclear physics) -- Periodicals; Thermoluminescence -- Periodicals; Cosmic rays -- Periodicals; Radiation -- Measurement -- Periodicals; Radiometry -- Periodicals; Radiation Monitoring -- Periodicals; Émulsions nucléaires -- Périodiques; Particules (Physique nucléaire) -- Traces -- Périodiques; Thermoluminescence -- Périodiques; Rayonnement cosmique -- Périodiques; Radiométrie -- Périodiques; 539.77
• DOI: 10.1016/j.radmeas.2016.02.018
• Languages: English
• ISSNs: 1350-4487

Abstract

Abstract: The timing characteristics of scintillation response of Czochralski-grown Gd3 Al2 Ga3 O12 :Ce and Gd3 Al2.6 Ga2.4 O12 :Ce single crystals were compared. The photoelectron yield, scintillation decay times, and coincidence time resolution were measured. At 662 keV γ-rays, the photoelectron yield of 6200 phe MeV −1 obtained for Gd3 Al2 Ga3 O12 :Ce is higher than that of 4970 phe MeV −1 obtained for Gd3 Al2.6 Ga2.4 O12 :Ce, while an inferior energy resolution of the former (7.2% vs. 5.6%) is observed. Scintillation decays are approximated by sum of exponentials with the dominant fast component decay time and its relative intensity of 89 ns (73%) for Gd3 Al2 Ga3 O12 :Ce and 136 ns (69%) for Gd3 Al2.6 Ga2.4 O12 :Ce. The coincidence time resolution obtained for Gd3 Al2 Ga3 O12 :Ce is superior than that of Gd3 Al2.6 Ga2.4 O12 :Ce. The normalized time resolution was also discussed in terms of a number of photoelectrons and decay characteristics of the light pulse. Highlights: Scintillation time response of GAGG:Ce crystals was studied. Gd3 Al2 Ga3 O12 :Ce exhibited superior timing characteristics. Energy resolution of 5.6% @662 keV was obtained for Gd3 Al2.6 Ga2.4 O12 :Ce. Coincidence time resolution of 345 ps was obtained for Gd3 Al2 Ga3 O12 :Ce.