Lanthanum scintillation crystals for gamma ray imaging
Lanthanum scintillation crystals for gamma ray imaging
复制标题
用于伽马射线成像的镧闪烁晶体
DOI：
10.1016/j.nima.2006.05.098
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发表时间：
2006
影响因子：
1.4
通讯作者：
F. Notaristefani
中科院分区：
文献类型：
--
作者：
R. Pani;P. Bennati;M. Betti;M. Cinti;R. Pellegrini;M. Mattioli;V. Cencelli;F. Navarria;D. Bollini;G. Moschini;F. Garibaldi;F. Notaristefani
在过去的三年中，人们对开发新型快速闪烁体（如LaCl3:Ce和LaBr3:Ce）的兴趣越来越大。它们卓越的能量分辨率为提高空间分辨率开辟了一条更容易的途径。本文介绍了第一台LaBr3:Ce小型伽马相机的测量结果。它是基于连续50×50mm2crystal， 5mm厚，整体组装与滨松平板PMT。这种探测器配置允许最窄的光分布和最高的光输出，从而分别获得最佳的空间和能量分辨率值。同时，5mm的晶体厚度在140keV光子能量下可实现80%的效率。空间分辨率的测量结果也与从另一个50×50mm2LaBr3:Ce晶体中获得的类似测量结果进行了比较，该晶体由一个3mm的玻璃光学窗口组装而成。并与LaBr3: ce1in得到的能量分辨率值作了进一步的比较。直径和厚度为光谱测量优化。第一台LaBr3:Ce伽马相机显示出优异的内在空间分辨率值，如0.9mm，在140keV光子能量下的最佳能量分辨率值为6.5%。
Over the last 3 years, there has been a growing interest in the development of a new class of fast scintillators such as LaCl3:Ce and LaBr3:Ce. Their superior energy resolution is opening an easier way to improve spatial resolution. In this paper we present the results obtained from the first LaBr3:Ce small gamma camera. It is based on continuous 50×50mm2crystal, 5mm thick, integral assembled with a Hamamatsu Flat panel PMT. This detector configuration permits the narrowest light distribution with the highest light output in order to obtain the best spatial and energy resolution values, respectively. At the same time, 5mm crystal thickness carries out 80% efficiency at 140keV photon energy. Measurements of spatial resolution are also compared with the analogous ones obtained from another 50×50mm2LaBr3:Ce crystal, assembled with a 3mm glass optical window. Energy resolution values have been furtherly compared with ones obtained from a LaBr3:Ce 1in. diameter and thickness optimized for spectrometric measurements. The first LaBr3:Ce gamma camera shows excellent intrinsic spatial resolution values such as 0.9mm, with a best energy resolution value of 6.5% at 140keV photon energy.