Fabrication and characterization of rectangular strontium iodide scintillator coupled to TSV-MPPC array

作者：Shimazoe K^*; Koyama A; Takahashi H; Sakuragi S; Yamasaki Y

来源：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment , 2017, 845: 503-506.

DOI：10.1016/j.nima.2016.06.077

• SrI2(Eu)
• SiPM
• MPPC

Europium-doped strontium iodide (SrI2(Eu)) is a promising material for the scintillation crystals in a Compton imaging system, which requires an excellent energy resolution, as an alternative to NaI(Tl) crystals. Rectangular SrI2(Eu) crystals with dimensions of 10 x 10 x 10 mm(3) are fabricated, aiming for coupling with semiconductor-based photodetectors, especially silicon photomultipliers (SiPMs) in array detectors. The fabricated crystals are evaluated by coupling with a thfough silicon via (TSV)-type multipixel photon counter (MPPC) with dimensions of 12.6 x 12.6 mm(2). The saturation response of the SiPMs is corrected by using Several photopeaks of isotopes with a fitting function. The measured energy resolution is approximately 4.4% at 662 keV compared with an energy resolution of 3.4% with a PMT, and the crystals exhibit the best energy resolution with a shaping time of 6 mu s. All of the five prepared samples exhibit very stable performance and are promising for our future Compton imaging system for environmental radiation monitoring.

• 出版日期2017-2-11