Three-dimensional position sensing and field shaping in orthogonal-strip germanium gamma-ray detectors.
Three-dimensional position sensing and field shaping in orthogonal-strip germanium gamma-ray detectors.
复制标题
正交带状锗伽马射线探测器中的三维位置传感和场整形。
DOI：
10.1016/s0168-9002(00)00351-x
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
P. Luke
中科院分区：
文献类型：
--
作者：
M. Amman;P. Luke
我们已经制作了一个原型的正交条锗探测器的γ射线成像研究。有了这个探测器，我们证明了在探测器中的伽马射线相互作用事件可以定位在三个维度。特别是，我们确定的相互作用的深度从时间差在检测器的一侧上的电极上的孔的到达和在相对的检测器表面上的电极上的电子的到达。这种交互深度感测应该导致改进的图像分辨率。这种检测器的另一个问题是由于在检测器电极之间的差距区域中发生的相互作用事件的不完全电荷收集导致的能量分辨率和效率的损失。我们还证明了我们的原型探测器，这个问题可以大大减少通过使用场成形电极。施加在电荷感测电极和场成形电极之间的偏压改善了电荷感测电极的电荷收集，并因此改善了检测器性能。
We have fabricated a prototype orthogonal-strip germanium detector for gamma-ray imaging studies. With this detector we demonstrate that a gamma-ray interaction event in the detector can be located in three dimensions. In particular, we determine the interaction depth from the difference in time in the arrival of the holes at an electrode on one side of the detector and the arrival of the electrons at an electrode on the opposing detector surface. This depth of interaction sensing should lead to improved image resolution. A separate issue with such a detector is the loss of energy resolution and efficiency resulting from incomplete charge collection for interaction events taking place in the gap regions between the detector electrodes. We also demonstrate with our prototype detector that this problem can be substantially reduced by using field-shaping electrodes. A bias applied between the charge-sensing electrodes and the field-shaping electrodes improves the charge collection to the charge-sensing electrodes and consequently the detector performance.