The temperature dependence of gamma-ray responses of YAG:Ce ceramic scintillators

Takahashi Hiromitsu

Yanagida Takayuki

Kasama Daisuke

Ito Takeshi

Kokubun Motohide

Makishima Kazuo

Yanagitani Takagimi

Yagi Hideki

Shigeta Takashi

Ito Takashi

IEEE Transactions on Nuclear Science

The temperature dependence (from -20 to +20 degrees C) of gamma-ray irradiated light outputs, energy resolutions, and decay time profiles of three YAG:Ce poly-ceramic scintillators are studied. The Ce concentrations are 0.5, 0.05, and 0.005 mol%.0 The relative light yield of the YAG:Ce with 0.5 mol% with a 2 μs shaping time was measured as 1 : 1.08 : 1.14 at +20, 0, and -20 degrees C, respectively, including the temperature dependence of the phototube (-0.2% /degree). The energy resolution stays almost constant at 7.2-1.984238or 662 keV gamma-rays. The ceramic with 0.05 mol??к_?ۿ?Sڟ?hows the almost same properties, while the light yield of that with 0.005 mol-1230736516s 2-4 times lower (hence the energy resolution becomes 14-19%). All the scintillators exhibit good linearities within ∼ 1 % between the light output and the irradiated gamma-ray energy from 59.5 keV to 662 keV. The decay time constants of the dominant decay components are about 80 ns and 300 ns at +20 degrees C. As the temperature increases from -20 to +20 degrees C, the effective decay of all the ceramics becomes faster, because the decay time constants and fractions of the slower components shorten and decrease, respectively. This result suggests that carriers which are captured in shallow traps before transferring excitation to Ce ions can escape the traps more easily at higher temperatures. Considering the decrease of the total light yield toward higher temperatures, it is thought that thermal quenching starts to dominate the temperature dependence of the ceramic YAG:Ce around the room temperature. The 0.5 mol?ڿ?R?@ʿ???S?cintillator shows a lower quenching energy than the 0.05 mol1001122502ne. This can be explained in terms of self absorption of Ce emission.

Ce3+

Ceramic

Quenching

Scintillators

emperature dependence

Y3Al5O12 (YAG)

Physics [ 420 ]

eng

IEEE

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[ISSN] 0018-9499

[DOI] 10.1109/TNS.2006.878575

[NCID] AA00667999

[DOI] http://dx.doi.org/10.1109/TNS.2006.878575 isVersionOf