Simultaneous measurements of damping and elastic modulus of copper as affected by electron irradiation have been made. These data do not follow the standard analysis, using the Granato-L\"ucke theory for damping, in which point defects, created by irradiation, are presumed to act as firm pinning points on dislocation lines. It is proposed instead that these defects are dragged along by the dislocation line moving under oscillating stress. This dragging can lead to an observed "anomalous" peak (initial increase and subsequent decrease) in the decrement as a function of electron dose.
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Simpson et al. (1971) studied this question.
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