Correlation of local trapping with crystal defects by direct observation of electron loss in a coaxial Ge(Li) detector
Description: 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)
Date: January 1, 1973
Creator: Strauss, M.G.; Sherman, I.S. & Bannon, R.W.
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