低放射性本底LaCl_(3)∶Ce晶体闪烁性能  

Scintillation Properties of LaCl_(3)∶Ce Crystal withLow Radioactivity Background

作　　者：侯越云 杨蕾 桂强[1] 张春生[1] 张明荣[1] HOU Yueyun;YANG Lei;GUI Qiang;ZHANG Chunsheng;ZHANG Mingrong(Beijing Glass Research Institute,Beijing 101111,China)

机构地区：[1]北京玻璃研究院,北京101111

出　　处：《应用技术学报》2021年第1期1-7,共7页Journal of Technology

摘　　要：使用锕系同位素含量低的原料制备了具有低放射性本底的10%Ce^(3+)掺杂氯化镧(LaCl_(3)∶Ce)样品。在制备的LaCl_(3)∶Ce晶体中,天然锕系放射性同位素的放射性本底约为0.713 counts·s^(–1)·cm^(–3)。对于662 keVγ射线,LaCl_(3)∶Ce晶体的能量分辨率(FWHM)为3.3%。此外,与相同尺寸Ø25 mm×50 mm的NaI∶Tl晶体相比,LaCl_(3)∶Ce晶体的峰谷比、相对光输出和峰值计数率分别为2.61倍、87.88%和1.96倍,并对晶体尺寸对LaCl_(3)∶Ce晶体的闪烁性能的影响进行了讨论。10%Ce3+-doped lanthanum chloride(LaCl_(3)∶Ce)crystals with low-radioactive background have been prepared using raw materials with low content of U-series isotopes.The radioactive background was estimated to be about 0.713 counts·s^(–1)·cm^(–3) resulted from the natural U-series radioactive isotopes in the prepared LaCl_(3)∶Ce crystal.The energy resolution(FWHM)of the LaCl_(3)∶Ce crystal was 3.3%for 662 keVγ-rays.Moreover,the peak-to-valley ratio,relative light output and peak count rate of the LaCl_(3)∶Ce crystal were approximately 2.61 times,87.88%and 1.96 times of that of NaI∶Tl crystal with the same size ofØ25 mm×50 mm,respectively.The effects of crystal size on the scintillation properties of the prepared LaCl_(3)∶Ce crystal were discussed.

关 键 词：LaCl_(3)∶Ce 闪烁晶体 本底计数率 能量分辨率 

分 类 号：O734[理学—晶体学]