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Proceedings Paper

GaAs semi-insulator detector for gamma and charged-particle radiation
Author(s): Kenneth J. Moy; Ching Lin Wang; John E. Flatley; Michael D. Pocha; Brent A. Davis; Ronald S. Wagner
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Paper Abstract

Silicon positive-intrinsic-negative (p-i-n) diodes have been used in plasma diagnostics by the Los Alamos and Lawrence Livermore National Laboratories (LANL and LLNL) since the early seventies. Since the response bandwidth of these detectors is relatively poor (typically, approximately 5 ns FWHM for 1 cm2 sensitive area and 250 micrometers depletion depth), they are too slow for high-speed applications. GaAs photoconductive detectors (PCD) have been developed since the early eighties at LANL and later at LLNL, and can be tailored by judicious neutron damage to provide the required high-speed bandwidth. Unfortunately, for surface absorbed or non-penetrating radiation, we have discovered that the PCD sensitivity is not flat across its gap, where the incident radiation is perpendicular to the bias electric field. This response non-uniformity can lead to erroneous measurements in cases where the radiation is spatially varying. To overcome this problem, we reoriented the GaAs chip to allow the radiation to be incident through the electrode and parallel to the bias electric field. Then to increase bandwidth, we doped the GaAs crystal with chromium to create trapping sites and provide large resistivity (approximately 109 (Omega) cm), thus creating a semi-insulator detector (SID). We present and discuss the merits of the SID versus PCD and p-i-n diode by showing pulse response data of each detector characterized with 16 MeV endpoint gamma and electron radiation created by the EG&G/EM linear accelerator (Linac) and 5 to 16.5 MeV proton radiation produced by the LLNL Tandem Van de Graaff (TVDG). Application of the SID in Compton electron spectrometry also is discussed.

Paper Details

Date Published: 22 December 1992
PDF: 9 pages
Proc. SPIE 1734, Gamma-Ray Detectors, (22 December 1992); doi: 10.1117/12.138584
Show Author Affiliations
Kenneth J. Moy, EG&G Energy Measurements, Inc. (United States)
Ching Lin Wang, Lawrence Livermore National Lab. (United States)
John E. Flatley, Lawrence Livermore National Lab. (United States)
Michael D. Pocha, Lawrence Livermore National Lab. (United States)
Brent A. Davis, EG&G Energy Measurements, Inc. (United States)
Ronald S. Wagner, Los Alamos National Lab. (United States)

Published in SPIE Proceedings Vol. 1734:
Gamma-Ray Detectors
Elena Aprile, Editor(s)

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