新型溴化镧闪烁晶体探测器研制

Preparation and Performance of New LaBr_3 Scintillation Crystal Detector

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%(^(137)Cs),在500 keV^1400 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^(138)La的0.077cm^(-3).s^(-1)本底辐射外,还有来源于^(227)Ac及其子体的0.99cc^(-1).s^(-1)本底辐射。

With optimized material mid packaged technology, a new LaBr3 scintillation crystal detector for γ rays is presented. It consists mainly of one piece of Ф1.5＂ × 1.5＂ LaBr3 ： 5% CeCl3 scintillation crystal and a 1：1.6231 -100 PMT, which are coupled with each other by organic silicone resin, then sealed integrally in Alalloy housing. The scintillation detector has an excellent energy resolution （FWHM） of 2.8% at 662 keV, 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 eps/ec which result from ^227Ae and its daughters and maybe further re- duced soon, besides that of about 0. 077 eps/ccfrom 138La isotope.