Signals induced in semiconductor gamma-ray imaging detectors

J. D. Eskin, H. H. Barrett, H. B. Barber

Research output: Contribution to journalArticlepeer-review

126 Scopus citations


The signal induced in a readout circuit connected to a pixel electrode in a semiconductor gamma-ray imaging array is calculated by solving the Laplace equation. Two approaches are presented that use Green functions in solving the boundary value problem: decomposition into basis functions, and construction of an infinite series of image charges. Another approach is developed based on the Ramo - Shockley theorem, which makes use of weighting potentials. These potentials may be readily calculated in three dimensions using a Fourier-transform propagation technique. An analytic solution is found for the special two-dimensional case of a strip detector. Experiments on CdZnTe square-pixel test structures using alpha radiation confirm the expected trends in pulse shape as a function of pixel size. Signals observed simultaneously on adjacent pixels also follow the predicted division of currents. Trends with pixel size are also confirmed in the shape of pulse-height spectra taken using a 99mTc source.

Original languageEnglish (US)
Pages (from-to)647-659
Number of pages13
JournalJournal of Applied Physics
Issue number2
StatePublished - Jan 15 1999

ASJC Scopus subject areas

  • General Physics and Astronomy


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