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The development of a germanium lithium-drift gamma spectrometer and preliminary applications to positron physics Dably, David Allan
Abstract
The development of a high-resolution gamma ray spectrometer incorporating a germanium lithium-drift radiation detector is described. Sources of electrical noise in detectors and low-noise field-effect transistor preamplifiers are discussed. Modifications were made to available preamplifier circuits with a slight improvement in noise characteristics. A very-low-noise preamplifier using a 2N3823 field-effect transistor was tested, and an unconventional design inductive-load field-effect transistor preamplifier was built and tested. Refinements on germanium detector preparation techniques previously in use are described with particular reference to the starting material used. The design of a stainless steel cryostat to house germanium detectors is discussed. Performance characteristics of a 5 cc. detector are given. Preliminary measurements with it of the Doppler broadening of the annihilation peak in Ni and Zn are presented. A spectrum of annihilations of ortho-positronium formed in Freon 12 is given. The detector system is evaluated with reference to suitability in positron physics.
Item Metadata
Title |
The development of a germanium lithium-drift gamma spectrometer and preliminary applications to positron physics
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1967
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Description |
The development of a high-resolution gamma ray spectrometer incorporating a germanium lithium-drift radiation detector is described. Sources of electrical noise in detectors and low-noise field-effect transistor preamplifiers are discussed. Modifications were made to available preamplifier circuits with a slight improvement in noise characteristics. A very-low-noise preamplifier using a 2N3823 field-effect transistor was tested, and an unconventional design inductive-load field-effect transistor preamplifier was built and tested. Refinements on germanium detector preparation techniques previously in use are described with particular reference to the starting material used. The design of a stainless steel cryostat to house germanium detectors is discussed. Performance characteristics of a 5 cc. detector are given. Preliminary measurements with it of the Doppler broadening of the annihilation peak in Ni and Zn are presented. A spectrum of annihilations of ortho-positronium formed in Freon 12 is given. The detector system is evaluated with reference to suitability in positron physics.
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Genre | |
Type | |
Language |
eng
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Date Available |
2011-07-30
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0084717
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
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Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.