Reducing NaI(Tl) Detector Spectrum Shift by Optimizing Pulse Integration Time-猫眼课题宝

通过优化脉冲积分时间减少 NaI(Tl) 探测器光谱偏移

DOI：

10.1109/tns.2020.2964497

发表时间：

2020-01

期刊：

IEEE Transactions on Nuclear Science

影响因子：

1.8

通讯作者：

中科院分区：

工程技术3区

文献类型：

作者：

Wei Qingyang;Zhang Zhaohui;Dai Tiantian;Liu Xin;Luo Gang;Xu Tianpeng;Jiang Nianming;Liu Yaqiang

碘化钠（铊）能谱法在许多领域被广泛用于伽马射线探测。它既可以用于活度测量，也可用于同位素识别。然而，碘化钠（铊）和光电倍增管（PMT）的发光对温度变化很敏感。

NaI(Tl) spectrometry is widely used in many areas for gamma-ray detection. It can be used for both activity measurement and isotope identification. However, the light generation of NaI(Tl) and photomultiplier tube (PMT) is sensitive to temperature changes, which lead to spectrum shift. Several calibration methods have been proposed, but they are complicated. In this article, we developed an NaI(Tl) spectrometry for indoor monitoring and studied the temperature influences from 5 °C to 35 °C using a 22Na source. We found that the severity of the temperature-dependent spectrum shift can be reduced by using fewer integration points (i.e., short integration time) for energy calculation. The spectrum shift can be reduced from 18.1% to 3.3% for 511 keV and from 18.0% to 3.7% for 1274 keV by using an integration time of 385 ns instead of $1.23~\mu \text{s}$ . In conclusion, the spectrum shift phenomenon can be reduced by reducing integration time. Thus, the indoor monitoring NaI(Tl) spectrometry might work properly for isotope identification without a complicated calibration procedure.