【摘要】 采用优选的封装材料及优化的工艺,将Φ1.5"×1.5"的LBC闪烁晶体与R6231-100光电倍增管直接耦合,并整体封装在铝合金外壳中,制成新型溴化镧闪烁晶体探测器。该探测器的能量分辨率为2.8%(¹³⁷Cs),在500 keV¹400 keV范围内能量响应的非线性为0.96%,脉冲幅度随探头方向的变化量为0.2%,在-30至+40℃范围内脉冲幅度输出的温度系数为-0.65%/℃。探测器除了来自于¹³⁸La的0.077cm^-3.s^-1本底辐射外,还有来源于²²⁷Ac及其子体的0.99cc^-1.s^-1本底辐射。更多还原

【Abstract】 With optimized material and packaged technology,a new LaBr₃ scintillation crystal detector for γ rays is presented.It consists mainly of one piece of Φ1.5 " × 1.5 " La Br3:5% CeCl₃ scintillation crystal and a R6231-100 PMT,which are coupled with each other by organic silicone resin,then sealed integrally in Al-alloy housing.The scintillation detector has an excellent energy resolution（FWHM） of 2.8% at 662 ke V,0.96% non-proportionality of energy response between 500-1400 keV,0.2% change of pulse height with different directions,and-0.65%/℃ change of pulse height with temperature between-30℃ and + 40℃.It has an internal activity of up to 0.99 cps/cc which result from ²²⁷Ac and its daughters and maybe further reduced soon,besides that of about 0.077 cps/cc from ¹³⁸La isotope.更多还原