Signals induced in semiconductor gamma-ray imaging detectors

Autor:	Harrison H. Barrett, H.B. Barber, J.D. Eskin
Rok vydání:	1999
Předmět:	Laplace's equation Physics Signal processing Partial differential equation Pixel Physics::Instrumentation and Detectors business.industry Detector General Physics and Astronomy Basis function Signal Optics Boundary value problem business
Zdroj:	Journal of Applied Physics. 85:647-659
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.369198
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::70cdcfdace6909bcb1c42bde4ab00287 https://doi.org/10.1063/1.369198 Zobrazit plný text záznamu