Performance evaluation for a radiation imaging detector using single-crystal GPS (Ce) plate

Performance evaluation for a radiation imaging detector using single-crystal GPS (Ce) plate
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使用单晶 GPS(Ce)板的辐射成像探测器的性能评估

DOI:
10.1088/1748-0221/14/10/p10025
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发表时间:
2019
影响因子:
1.3
通讯作者:
Ishibashi H.
Ishibashi H.
中科院分区:
工程技术4区
文献类型:
--
作者:
Yamamoto S.;Ito T.;Takekawa S.;Suzuki Y.;Nagao K.;Anzai Y.;Ishibashi H.

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掺铈焦硅酸钆(GPS(Ce),Gd 2Si 2 O 7)是一种高亮度的闪烁体,有望成为高分辨率辐射成像探测器的候选材料。因此,我们制作了一个GPS(Ce)成像探测器使用的单晶GPS(Ce)板与位置敏感光电倍增管(PSPMT)相结合。通过性能评估,我们发现,对Am-241 α粒子(5.5MeV)的空间分辨为15%FWHM,空间分辨为0.5mmFWHM。5.5 MeV α粒子和662 keV Cs-137 γ光子之间的GPS(Ce)衰变时间差为7 ns,这不足以用脉冲形状鉴别法分离每幅图像。但由于α/γ比值较大(0.35),因此可以通过能谱分离出5.5MeV的α粒子和662 keV的Cs-137 γ光子。结果表明,采用单晶GPS(Ce)的成像探测器对辐射,特别是α粒子的探测是很有前途的。
Cerium doped gadolinium pyrosilicate (GPS (Ce), Gd 2 Si 2 O 7), which is a scintillator with a high light output, is a likely candidate to develop high-resolution radiation imaging detectors. Thus we fabricated a GPS (Ce) imaging detector using a single-crystal GPS (Ce) plate in combination with a position-sensitive photomultiplier tube (PSPMT). Through a performance evaluation, we found that the spatial resolution was∼ 0.5 mm FWHM for Am-241 α particles (5.5 MeV) with an energy resolution of 15% FWHM. The decay time difference of GPS (Ce) between 5.5 MeV α particles and 662 keV Cs-137 γ photons was 7 ns, which was insufficient to separate each image using pulse-shape discrimination. However, the α/γ ratio was large (0.35), so it was possible to separate 5.5 MeV α particles and 662 keV Cs-137 γ photons by the energy spectra. We conclude that the imaging detector using single-crystal GPS (Ce) is promising for radiation, especially for α particles.
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