Positron lifetime as a function of grain size |
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Authors: | H. P. Leighly Jr. |
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Affiliation: | (1) Department of Metallurgical and Nuclear Engineering, University of Missouri-Rolla, 65401 Rolla, Missouri |
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Abstract: | Published data on positron annihilation lifetime in copper as a function of grain size have been analyzed to show that there is a linear relationship between the internal grain boundary surface area, per unit volume,S v, and the positron lifetime, τ. The analysis indicates that grain boundaries are important in the trapping of positrons. It is suggested that the slope of the resulting straight line,dS v/dτ, can be used to determine the annihilation rate of the grain boundaries. |
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Keywords: | 78.70 61.70 |
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