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

Journal Article · · IEEE Trans. Nucl. Sci.; (United States)
 [1]; ; ; ;
  1. Argonne National Lab., IL
+ Show Author Affiliations

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).

OSTI ID:
6512265
Journal Information:
IEEE Trans. Nucl. Sci.; (United States), Journal Name: IEEE Trans. Nucl. Sci.; (United States) Vol. NS-24:1; ISSN IETNA
Country of Publication:
United States
Language:
English

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Related Subjects

440103* -- Radiation Instrumentation-- Nuclear Spectroscopic Instrumentation
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ABSORPTION
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CRYSTALS
DIAGNOSTIC TECHNIQUES
DIMENSIONS
EFFICIENCY
ELEMENTS
GAMMA SPECTROMETERS
GE SEMICONDUCTOR DETECTORS
GERMANIUM
HOURS LIVING RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
INTERNAL IONIZATION
IONIZATION
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LI-DRIFTED DETECTORS
LI-DRIFTED GE DETECTORS
MEASURING INSTRUMENTS
METALS
NUCLEI
ODD-EVEN NUCLEI
RADIATION DETECTORS
RADIOISOTOPES
SEMICONDUCTOR DETECTORS
SPECTROMETERS
TECHNETIUM 99
TECHNETIUM ISOTOPES
THICKNESS
YEARS LIVING RADIOISOTOPES