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Proceedings Paper

Germanium orthogonal strip detector system for gamma-ray imaging
Author(s): Ethan L. Hull; Morgan Burks; Chris P. Cork; William W. Craig; Del Eckels; Lorenzo Fabris; Anthony D. Lavietes; Paul N. Luke; Norman W. Madden; Richard H. Pehl; Klaus Ziock
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Paper Abstract

A germanium-detector based, gamma-ray imaging system has been designed, fabricated, and tested. The detector, cryostat, electronics, readout, and imaging software are discussed. An 11 millimeter thick, 2 millimeter pitch 19x19 orthogonal strip planar germanium detector is used in front of a coaxial detector to provide broad energy coverage. The planar detector was fabricated using amorphous germanium contacts. Each channel is read out with a compact, low noise external FET preamplifier specially designed for this detector. A bank of shaping amplifiers, fast amplifiers, and fast leading edge discriminators were designed and fabricated to process the signals from preamplifiers. The readout system coordinates time coincident x-y strip addresses with an x-strip spectroscopy signal and a spectroscopy signal from the coaxial detector. This information is sent to a computer where an image is formed. Preliminary shadow and pinhole images demonstrate the viability of a germanium based imaging system. The excellent energy resolution of the germanium detector system provides isotopic imaging.

Paper Details

Date Published: 18 December 2001
PDF: 9 pages
Proc. SPIE 4507, Hard X-Ray and Gamma-Ray Detector Physics III, (18 December 2001); doi: 10.1117/12.450750
Show Author Affiliations
Ethan L. Hull, Lawrence Berkeley National Lab. (United States)
Morgan Burks, Lawrence Berkeley National Lab. (United States)
Chris P. Cork, Lawrence Berkeley National Lab. (United States)
William W. Craig, Lawrence Livermore National Lab. (United States)
Del Eckels, Lawrence Livermore National Lab. (United States)
Lorenzo Fabris, Lawrence Berkeley National Lab. (United States)
Anthony D. Lavietes, Lawrence Livermore National Lab. (United States)
Paul N. Luke, Lawrence Berkeley National Lab. (United States)
Norman W. Madden, Lawrence Berkeley National Lab. (United States)
Richard H. Pehl, Lawrence Berkeley National Lab. (United States)
Klaus Ziock, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 4507:
Hard X-Ray and Gamma-Ray Detector Physics III
Ralph B. James, Editor(s)

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