Performance evaluation of newly developed SrI2(Eu) scintillator
Performance evaluation of newly developed SrI2(Eu) scintillator
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新研制的SrI2(Eu)闪烁体的性能评价
DOI：
10.1016/j.nima.2016.04.043
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
J.Kataoka et al.
中科院分区：
文献类型：
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作者：
M.Takabe;A.Kishimoto;J.Kataoka et al.
掺Eu的碘化锶(SRI2(Eu))的发展引起了人们的极大关注，因为它在伽马射线闪烁体应用方面具有优异的材料性能。这些特性包括其出色的能量分辨率、高输出光(>；80,000 ph/MeV)和高有效原子序数(Z=49)。本文报道了联合材料公司新制造的SRI 2(Eu)柱状晶体中ϕ1 In×1的性能。在这项研究中，我们使用光学耦合的2 in光电倍增管(超级双碱，滨松)测量了−40到40℃之间10°C温度间隔下的能量分辨率和光输出。随着温度的降低，SRI2(Eu)光输出增加0.12%/°C。在−40°C下，我们获得了用137Cs测量的662keV伽马射线的最佳能量分辨率，记录了2.91±0.02%的半高宽。为了比较，我们还使用了大面积(19×19mm2)雪崩光电二极管探测器(APD)和8×8个3×3mm2像素的多像素光子计数器(MPPC)阵列对同一晶体进行了测量。用光电倍增管、光电倍增管和多光子发射计算机在−20°C测量的能量分辨率分别为2.94±0.02%、3.14±0.06%和3.99±0.01%。在由5-10 cm厚的铜铅块组成的洞穴中测量了SRI2(Eu)的本底，证实了SRI2(Eu)具有极低的本底辐射。在这项研究中，我们已经证明了SRI 2(Eu)是一种很有前途的闪烁体，可以用于包括低能X射线到高能伽马射线的辐射测量，因此在不久的将来可以应用于各种医疗、工业和环境处理领域。
The development of europium-doped strontium iodide (SrI 2 (Eu)) has attracted considerable attention, because of its excellent material properties as regards gamma-ray scintillator applications. These include its excellent energy resolution, high light output (> 80, 000 ph/MeV), and high effective atomic number (Z= 49). Here we report on the performance of ϕ 1 in× 1 in SrI 2 (Eu) cylindrical crystals newly fabricated by Union Materials Inc. In this study, we measured the energy resolution and light output at 10° C temperature intervals between− 40 and 40° C, using an optically coupled 2-in photomultiplier tube (PMT)(Super Bialkali, Hamamatsu). The SrI 2 (Eu) light output increased by 0.12%/° C as the temperature decreased. At− 40° C, we obtained the optimal energy resolution recording 2.91±0.02% full width at half maximum (FWHM) for 662 keV gamma rays measured with 137 Cs. For comparison, we also measured the same crystal using both a large-area (19× 19 mm 2) avalanche photodiode detector (APD) and 8× 8 multi-pixel photon counter (MPPC) arrays of 3× 3 mm 2 pixels. The energy resolutions of 2.94±0.02%, 3.14±0.06% and 3.99±0.01% were obtained using PMT, APD, and MPPC, respectively, as measured at− 20° C. We also measured the inherent background of SrI 2 (Eu) in a cave composed of Cu–Pb blocks with their thickness of 5–10 cm confirming that SrI 2 (Eu) has an extremely low inherent background radiation. In this study, we have shown that SrI 2 (Eu) is a promising scintillator that can be utilized for radiation measurements incorporating low-energy X-rays to high-energy gamma rays, and can thus be applied in various medical, industrial, and environmental treatment fields in the near future.