Radial efficiency gradients in Ge(Li) gamma detectors |
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Authors: | R M Lindstrom |
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Institution: | (1) Analytical Chemistry Division, National Bureau of Standards, 20234 Washington, D. C., (USA) |
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Abstract: | Counting of radioactive sources in contact with the vacuum container of a Ge(Li) detector may lead to errors because of large
efficiency gradients. In order to explore the radial dimension of this problem, several point sources were stepped across
in contact with the cap of several detectors, and curves of absolute efficiency against radius were measured. The insensitive
core of an open-end coaxial detector reduced the central point-source efficiency at 122 keV at the cap to 20% less than a
comparable closed-end detector. In compensation, however, there was a reduction in the radial efficiency gradient. The radial
efficiency gradient was approximately proportional to the radius, with the central flattening for the open-end detector superimposed
on the trend. |
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Keywords: | |
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