| 籽晶保护条件下铈掺杂溴化镧晶体生长及其性能 |
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| 引用本文： | 张志城,方声浩.籽晶保护条件下铈掺杂溴化镧晶体生长及其性能[J].集美大学学报(自然科学版),2022,0(6):565-569. |
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| 作者姓名： | 张志城 方声浩 |
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| 作者单位： | （中国科学院福建物质结构研究所，福建 福州 350002） |
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| 摘 要： | 为定向生长出铈掺杂溴化镧（LaBr3:Ce）晶体，改进了坩埚下降法，并在籽晶接种过程引进冷却气体的保护装置。生长出的LaBr3:Ce晶体在137Cs放射源辐照下，其能量分辨率为3.08%，衰减时间为20.1 ns。采用多通道DRS4采集系统，以XP20D0型光电倍增管耦合 Ф 20 mm×5 mm 溴化镧器件作为开始道探测器，H8500型光电倍增管耦合LaBr3:Ce阵列作为被测停止道探测器，放射源为22Na（511 keV）。制备了6×6的LaBr3:Ce阵列，单根晶体条的尺寸为2 mm×2 mm×15 mm。利用数字化波形分析法，获得阵列的清晰二维散点图和一维位置谱，阵列x和y方向的位置分辨率分别为1.01 mm和0.89 mm。制备出的LaBr3:Ce晶体具有优异的能量分辨率和位置分辨率，可以应用于PET等医学成像技术领域。
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| 关 键 词： | 溴化镧 能量分辨率 阵列 二维散点图 位置分辨率 |
Growth of Ce3+ Doped LaBr3 with Protected-Seed and Its Scintillation Properties |
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| ZHANG Zhicheng,FANG Shenghao.Growth of Ce3+ Doped LaBr3 with Protected-Seed and Its Scintillation Properties[J].the Editorial Board of Jimei University(Natural Science),2022,0(6):565-569. |
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| Authors: | ZHANG Zhicheng FANG Shenghao |
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| Affiliation: | (Fujian Institute of Research on the Structure of Matter,CAS,Fuzhou 350002,China ) |
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| Abstract: | Ce3+ doped LaBr3 crystals were grown by a modified Bridgman technique with selective-seed,which was protected under cool gas.LaBr3:Ce scintillator has an FWHM energy resolution of 3.08% and a decay time of 20.1 ns under γ-ray excitation of 137Cs radioactive source．A 6×6 array of LaBr3 scintillator pixels was developed with a pixel size of 2 mm×2 mm×15 mm.A muti-channels DRS4 board system was used to process signals from a pair of detectors with XP20D0 PMT coupled with a Ф 20 mm×5 mm LaBr3:Ce scintillator as START Channel,and H8500 PMT coupled with a LaBr3:Ce scintillators array as tested STOP Channel,which were placed apart from a 22Na source for 511 keV γ-ray.The results based on analysis of digital waveform methods show that the DRS4 system has clear black scattered points on two-dimensional crystal scatter image.While the one-dimensional position images show that the position resolutions are 1.01 mm and 0.89 mm,in xand ydirections respectively.The excellent energy resolution and position resolution properties of LaBr3:Ce samples,indicate that it can be used in the nuclear image technique such as PET data acquisition system． |
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| Keywords: | LaBr3 energy resolution array two-dimensional scatter image position resolution |
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