Correlation of local trapping with crystal defects by direct observation of electron loss in a coaxial Ge(Li) detector

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From nuclear science symposium; San Francisco, California, USA (14 Nov 1973). A propeller-shaped region of reduced full-energy-peak efficiency was observed on the face of a true coaxial Ge(Li) detector for use in a gamma camera. A similar pattern on the etch-pit photograph suggests that the propeller blades correspond to the 111 symmetry axes of the crystal. Spectra obtained when a 122 keV gamma -ray beam was directed at this degraded region, show a low energy tail which is not present when the beam is directed at normal regions. Current pulses corresponding to gamma -rays that interact in the propeller region ... continued below

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Pages: 12

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Strauss, M.G.; Sherman, I.S. & Bannon, R.W. January 1, 1973.

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From nuclear science symposium; San Francisco, California, USA (14 Nov 1973). A propeller-shaped region of reduced full-energy-peak efficiency was observed on the face of a true coaxial Ge(Li) detector for use in a gamma camera. A similar pattern on the etch-pit photograph suggests that the propeller blades correspond to the 111 symmetry axes of the crystal. Spectra obtained when a 122 keV gamma -ray beam was directed at this degraded region, show a low energy tail which is not present when the beam is directed at normal regions. Current pulses corresponding to gamma -rays that interact in the propeller region have shapes that show deficiencies in the electron component. Thus, degraded crystal regions that are revealed by etch-pit distributions can be correlated to local detector performance by direct observation of trapping rather than only by inference from the presence of tails in the energy spectra. (auth)

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Pages: 12

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  • Nuclear science symposium, San Francisco, California, USA, 14 Nov 1973

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  • Report No.: CONF-731112--2
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 4388734
  • Archival Resource Key: ark:/67531/metadc1024770

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  • January 1, 1973

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  • Oct. 15, 2017, 10:09 p.m.

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  • Oct. 27, 2017, 2:09 p.m.

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Strauss, M.G.; Sherman, I.S. & Bannon, R.W. Correlation of local trapping with crystal defects by direct observation of electron loss in a coaxial Ge(Li) detector, article, January 1, 1973; Illinois. (digital.library.unt.edu/ark:/67531/metadc1024770/: accessed November 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.