Efficient design of a ∅2×2 inch NaI(Tl) scintillation detector coupled with a SiPM in an aquatic environment
Efficient design of a ∅2×2 inch NaI(Tl) scintillation detector coupled with a SiPM in an aquatic environment
复制标题
DOI：
10.1016/j.net.2019.01.017
复制
发表时间：
2019-07
影响因子：
2.7
通讯作者：
Junhyeok Kim;Kyeongjin Park;Jisung Hwang;Hojik Kim;JinHwan Kim;Hyunduk Kim;Sung-Hee Jung;Young-Su Kim;G. Cho
中科院分区：
文献类型：
--
作者：
Junhyeok Kim;Kyeongjin Park;Jisung Hwang;Hojik Kim;JinHwan Kim;Hyunduk Kim;Sung-Hee Jung;Young-Su Kim;G. Cho
2011年福岛核事故后，公众对邻国沉降物对水资源造成放射性污染的担忧日益增加。然而，目前仍然没有能够迅速检测放射性核素的初始反应系统。本研究的目的是开发最有效的伽马能谱仪来监测水环境中的放射性核素。我们选择了铊掺杂碘化钠（碘化钠（铊））闪烁体读出与硅光电倍增管（SiPM），由于其紧凑性和低工作电压。测试了三种类型的闪烁探测器。一个系统由闪烁体和光电倍增管（PMT）作为参考组成;另一个系统由闪烁体和具有光导的SiPM阵列组成;另一个系统是直接与SiPM阵列耦合的闪烁体。在基于SiPM的探测器中，直接耦合系统在所有能量峰处显示出最好的能量分辨率。它实现了9.76%的能量分辨率为662 keV的伽马射线。通过额外的实验和模拟，我们证明了光导降低了能量分辨率，增加了统计不确定性。结果表明，无光导的SiPM闪烁探测器是监测水环境中放射性核素的最有效的设计。
After the Fukushima accident in 2011, there has been increased public concern about radioactive contamination of water resources through fallout in neighboring countries. However, there is still no available initial response system that can promptly detect radionuclides. The purpose of this research is to develop the most efficient gamma spectrometer to monitor radionuclides in an aquatic environment. We chose a thallium-doped sodium iodide (NaI(Tl)) scintillator readout with a silicon photo multiplier (SiPM) due to its compactness and low operating voltage. Three types of a scintillation detector were tested. One was composed of a scintillator and a photomultiplier tube (PMT) as a reference; another system consisted of a scintillator and an array of SiPMs with a light guide; and the other was a scintillator directly coupled with an array of SiPMs. Among the SiPM-based detectors, the direct coupling system showed the best energy resolution at all energy peaks. It achieved 9.76% energy resolution for a 662 keV gamma ray. Through additional experiments and a simulation, we proved that the light guide degraded energy resolution with increasing statistical uncertainty. The results indicated that the SiPM-based scintillation detector with no light guide is the most efficient design for monitoring radionuclides in an aquatic environment.