Investigation of charge sharing among electrode strips for a CdZnTe detector

Details Investigation of charge sharing among electrode strips for a CdZnTe detector Investigation of charge sharing among electrode strips for a CdZnTe detector

2001-03-06

arxiv.org/abs/astro-ph/0103097v1

Astronomy and Astrophysics

Astrophysics

16 pages 10 figures. Accepted for publication in Nuclear Instruments and Methods - A

Scientific paper

10.1016/S0168-9002(01)00892-0

We have investigated charge sharing among the anode strips of a CdZnTe (CZT) detector using a 30 micrometer collimated gamma-ray beam. We compared the laboratory measurements with the predictions from our modeling of the charge transport within the detector. The results indicate that charge sharing is a function of the interaction depth and the energy of the incoming photon. Also, depending on depth, a fraction of the electrons might drift to the inter-anode region causing incomplete charge collection. Here, we show that photoelectron range and diffusion of the charge cloud are the principal causes of charge sharing and obtain limits on the size of the electron cloud as a function of position in the detector.

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