Intrinsic efficiency of germanium: a basis for calculating expected detector efficiency

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A method is presented whereby the intrinsic efficiency of Ge is utilized to calculate the expected peak efficiency of detectors having a wide range of sizes. The intrinsic efficiency of Ge, which is the probability for total absorption, was measured at 122 and 136 keV in Ge(Li) coaxial detectors and HPGe planar detectors having an effective thickness ranging from 5 to 50 mm. At 136 keV it is 64% for a thickness of 10 mm and 82% for 20 mm, after which it levels off reaching 89% at 50 mm. It is shown that the peak efficiency of a detector ... continued below

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7 pages

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Strauss, M. G.; Sherman, I. S.; Cattelino, M. J.; Brenner, R. & Pehl, R. H. January 1, 1976.

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A method is presented whereby the intrinsic efficiency of Ge is utilized to calculate the expected peak efficiency of detectors having a wide range of sizes. The intrinsic efficiency of Ge, which is the probability for total absorption, was measured at 122 and 136 keV in Ge(Li) coaxial detectors and HPGe planar detectors having an effective thickness ranging from 5 to 50 mm. At 136 keV it is 64% for a thickness of 10 mm and 82% for 20 mm, after which it levels off reaching 89% at 50 mm. It is shown that the peak efficiency of a detector is a product of only the intrinsic efficiency and the solid angle, once losses due to edge escape and detector imperfections (surface channels and high dislocation densities) are determined. The absolute and relative (to NaI(Tl)) peak efficiency of a sample detector, calculated on the basis of intrinsic efficiency, are in good agreement with measured values. This method should find applications in the design of new detector systems particularly those for diagnostic imaging with /sup 99/Tc (140 keV).

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7 pages

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Dep. NTIS

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  • Nuclear science, scintillation and semiconductor counter symposium, New Orleans, LA, USA, 20 Oct 1976

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  • Report No.: CONF-761006-37
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 7230507
  • Archival Resource Key: ark:/67531/metadc1444372

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Office of Scientific & Technical Information Technical Reports

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  • January 1, 1976

Added to The UNT Digital Library

  • Feb. 10, 2019, 8:45 p.m.

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  • May 6, 2019, 8:14 p.m.

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Strauss, M. G.; Sherman, I. S.; Cattelino, M. J.; Brenner, R. & Pehl, R. H. Intrinsic efficiency of germanium: a basis for calculating expected detector efficiency, article, January 1, 1976; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1444372/: accessed May 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.