Abstract
High Z sensor materials such as GaAs, CdZnTe or CdTe provide high absorption efficiency for radiation caused by radioactive sources and are therefore suited for the usage in radiation detection devices like gamma cameras. An increase in sensor layer thickness enhances the absorption efficiency further but increases unwanted effects like charge sharing. This work presents the characterization and performance of the first 3 mm CdTe sensor connected to a readout chip of the Medipix/Timepix detector family. The parameters of a developed cluster analysis are shown to fully utilize the detector configuration in a gamma camera. Spectroscopic measurements regarding the common radioactive sources 60Cobalt, 137Cesium, 152Europium and 241Americium are investigated. The absorption efficiency of the 3 mm CdTe sensor is compared to a 0.45 mm CdTe and a 1 mm CdTe detector configuration. The charge sharing effect is successfully reduced with cluster analysis and the thicker sensor profits significantly from the increased absorption efficiency, especially in higher energy ranges (> 100 keV). The information gain of the charge sharing effect regarding cluster size and shape can be further used for identification of the investigated isotopes.
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