Attenuation characteristics of scintillation photons from Ce-doped Gd₃Al₂Ga₃O₁₂ (Ce:GAGG) scintillators were investigated by measuring samples of various sizes. Scintillation light is attenuated by two factors. The first is self-absorption of the Ce:GAGG scintillator itself, and the second is geometrical effects such as reflection properties caused by reflector wrapping. The attenuation coefficient of the Ce:GAGGs was determined as $0.00155\pm 0.00006$ mm ⁻¹ indicating that the scintillation light decays to 1/e as it passes approximately 645 ± 26 mm through the Ce:GAGG. This attenuation does not affect the entire wavelength range; however, it significantly occurs only in the wavelength range from 460 nm to 510 nm where emission and absorption overlap. In the narrow Ce:GAGG scintillator used in this experiment, the geometrical attenuation effect was in the overall wavelength, and the attenuation coefficient was 0.010 ± 0.001 mm ⁻¹. In this setup, the self-absorption effect only occupied 10% of the whole attenuation, while geometrical attenuation significantly affected the number of detected photons.

通过测量各种尺寸的样品，研究了掺Ce的Gd ₃ Al ₂ Ga ₃ O ₁₂（Ce：GAGG）闪烁体产生的闪烁光子的衰减特性。闪烁光被两个因素衰减。第一个是Ce：GAGG闪烁体本身的自吸收，第二个是几何效应，例如由反射器包裹引起的反射特性。Ce：GAGGs的衰减系数确定为$0。00155\pm 0。00006$mm ^-1表示闪烁光通过Ce：GAGG约645±26 mm时衰减至1 / e。这种衰减不会影响整个波长范围。但是，它仅在发射和吸收重叠的460 nm至510 nm波长范围内显着发生。在本实验中使用的窄Ce：GAGG闪烁体中，几何衰减效应在整个波长范围内，衰减系数为0.010±0.001 mm ^-1。在这种设置中，自吸收效应仅占整个衰减的10％，而几何衰减则显着影响检测到的光子数量。