【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%Ce³⁺掺杂氯化镧（LaCl₃∶Ce）样品。在制备的LaCl₃∶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,LaCl₃∶Ce晶体的能量分辨率（FWHM）为3.3%。此外,与相同尺寸?25 mm×50 mm的NaI∶Tl晶体相比,LaCl₃∶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LaCl₃∶Ce晶体的闪烁性能的影响进行了讨论。更多还原

【Abstract】 10% Ce³⁺-doped lanthanum chloride（LaCl₃∶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 LaCl₃∶Ce crystal. The energy resolution（FWHM） of the LaCl₃∶Ce crystal was 3.3% for 662 keVγ-rays. Moreover, the peak-to-valley ratio, relative light output and peak count rate of the LaCl₃∶Ce crystal were approximately 2.61 times, 87.88% and 1.96 times of that of NaI∶Tl crystal with the same size of?25 mm× 50 mm, respectively. The effects of crystal size on the scintillation properties of the prepared LaCl₃∶Ce crystal were discussed.更多还原