NaI(T1) scintillator read out with SiPM array for gamma spectrometer
NaI(T1) scintillator read out with SiPM array for gamma spectrometer
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DOI：
10.1016/j.nima.2017.01.068
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发表时间：
2017-04-11
影响因子：
1.4
通讯作者：
Wang, Biao
中科院分区：
文献类型：
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作者：
Huang, Tuchen;Fu, Qibin;Wang, Biao
Nal(T1) 闪烁体广泛应用于带有光电倍增管 (PMT) 读数的伽马能谱仪。最近开发的硅光电倍增管（SiPM）提供与 PMT 相似的增益和效率，但具有偏置电压低、体积紧凑、成本低、坚固耐用和磁共振兼容性等优点。在这项研究中，2 英寸。和 1 英寸。 Na!(T1)闪烁体是用SiPM阵列读出的，该阵列是通过在印刷电路板上平铺多个SiPM制成的，每个SiPM的有源面积为6x6 mm(2)。 661.6 keV 伽马射线的能量分辨率，通过与 6x6 ch SiPM 阵列耦合的 phi 2x2 in. 闪烁体和与 4x4 ch SiPM 阵列耦合的 phi 1 x1 in. 闪烁体获得，分别为 7.6% 和 7.8%，与传统双碱 PMT 获得的结果（分别为 7.3% 和 7.6%）非常接近。通过添加光导或使用具有锥形头的闪烁体，还研究了与较小面积的光电探测器耦合的闪烁体。后者表现出比使用光导更好的性能。 1 英寸。带有锥形头的 NaI(T1) 闪烁体耦合。 2x2 通道 SiPM 阵列在 661.6 keV 处实现了 7.7% 的能量分辨率，与使用标准 Phi 21x1 英寸闪烁体耦合到 4x4 通道 SiPM 阵列获得的能量分辨率相同。而 2 英寸。具有相似几何形状的闪烁体显示出能量分辨率下降，在 661.6 keV 时降低了 10.2%，但当高效率优于能量分辨率时，仍然可以使用。
The Nal(T1) scintillator is widely used in gamma spectrometer with photomultiplier tube (PMT) readout. Recently developed silicon photomultiplier (SiPM) offers gain and efficiency similar to those of PMT, but with merits such as low bias voltage, compact volume, low cost, high ruggedness and magnetic resonance compatibility. In this study, 2 -in. and 1 -in. Na!(T1) scintillators were readout with SiPM arrays, which were made by tiling multiple SiPMs each with an active area of 6x6 mm(2) on a printed circuit board. The energy resolutions for 661.6 keV gamma rays, obtained with phi 2x2 in. scintillator coupled to 6x6 ch SiPM array and phi 1 x1 in. scintillator coupled to 4x4 ch SiPM array were 7.6% and 7.8%, respectively, and were very close to the results obtained with traditional bialkali PMT (7.3% and 7.6%, respectively). Scintillator coupled to photodetector with smaller area was also studied by adding a light guide or using scintillator with tapered head. The latter showed better performance than using light guide. The 1 -in. NaI(T1) scintillator with tapered head coupled. to 2x2 ch SiPM array achieved 7.7% energy resolution at 661.6 keV, the same as that obtained with standard Phi 21x1 in. scintillator coupled to 4x4 ch SiPM array. While the 2-in. scintillator with similar geometry showed degraded energy resolution, 10.2% at 661.6 keV, but could still be used when high efficiency is preferred over energy resolution.