测量放射性气体氙同位素的Si-PIN β探测器研制

大气中的放射性氙是全面禁止核试验条约组织重点关注的监测对象，提高放射性氙同位素的探测灵敏度和测量准确度是目前全面禁止核试验条约监测领域研究的前沿课题。本文研制了一种采用Si-PIN半导体制作的测量放射性气体氙同位素的β探测器，其对¹³¹Xe^m的129 keV内转换电子的能量分辨率达11.2%，远优于塑料闪烁体的能量分辨率；氙记忆效应非常小，仅为0.08%。Si-PIN β探测器的优异性能将提高氙样品测量分析的核素识别能力和测量准确度。

Study of Si-PIN β Detector for Measuring Radioactive Gas Xenon Isotope

Radioactive xenon in the atmosphere is one of important components for international monitoring system (IMS) of comprehensive nuclear-test-ban treaty (CTBT). To improve the detection sensitivity and measurement accuracy of radioactive xenon isotopes is the forefront of CTBT research. In the work, a type of β detector made of Si-PIN semiconductor for measuring radioactive gas xenon isotopes was developed. The electron energy resolution of the Si-PIN β detector is about 11.2% (129 keV ¹³¹Xe^m) and far superior to the electron energy resolution of the plastic scintillator. The xenon memory effect of the Si-PIN β detector is only 0.08%. So the excellent performance of the Si-PIN β detector will improve the identification ability and measurement accuracy of the xenon sample analysis.