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Fabrication and Characterization of Rectangular Strontium Iodide Scintillator Coupled to TSV-MPPC Array

Research paper by K. Shimazoe, A. Koyama, H. Takahashi, S. Sakuragi, Y. Yamasaki

Indexed on: 17 Jun '16Published on: 16 Jun '16Published in: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment



Abstract

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 <img height="18" border="0" style="vertical-align:bottom" width="91" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0168900216306404-si0007.gif">10×10×10mm3 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 through silicon via (TSV)-type multipixel photon counter (MPPC) with dimensions of <img height="15" border="0" style="vertical-align:bottom" width="32" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0168900216306404-si0008.gif">12.6×12.6mm2. 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 sexhibit the best energy resolution with a shaping time of <img height="18" border="0" style="vertical-align:bottom" width="83" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0168900216306404-si0009.gif">6μs. All of the five prepared samples exhibit very stable performance and are promising for our future Compton imaging system for environmental radiation monitoring.

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