科研之友
微信
新浪微博
Facebook
分享链接
摘要
Eu:SrI2 bulk single crystals with 1.5-in diameter were grown using the Bridgman-Stockbarger technique and special-shaped crucibles. We will report on the growth of the 1.5-in size Eu: SrI2 single crystal and the preliminary test of the same sample cut in size of 10 x 10 x 10 mm(3) with polishing. An energy resolution of 3.2% full width at half maximum (FWHM) was obtained for Cs-137. After cutting and polishing the grown crystal to the size of 3 x 3 x 3 mm(3), 8 x 8 matrix Eu:SrI2 arrays were fabricated. We made a test module consisting of Eu:SrI2 arrays, which was optically coupled with position sensitive photomultiplier tube (PSPMT) and multipixel photon counter (MPPC) array. The position and energy performance of the test module were evaluated using Cs-137 and Co-57 radioactive sources. As a result, we were able to resolve all pixels clearly. A good energy resolution of 6.7% +/- 0.7% (FWHM) and 8.2% +/- 2.5% (FWHM) for 662 keV was obtained using PSPMT and MPPC arrays, respectively. In the same way, energy resolution of 12.7% +/- 1.3% and 14.7% +/- 3.4% (FWHM) for 122 keV was obtained using PSPMT and MPPC-array, respectively. These energy resolutions considerably degraded compared with an energy resolution of the single piece of Eu:SrI2 sample owing to the thinness of the Teflon reflector. This conclusion can be considered as a strong motivation for future research on the choice of reflector materials and structure of the Eu:SrI2 array.
- 出版日期2017-7
