Abstract
Copper single crystals have been subjected to irradiation with 1.2 MeV Co 60 gamma rays at room temperature. This irradiation causes an increase in the Young's modulus and a decrease in the internal friction. These effects are quantitatively consistent with an interpretation on the basis of the pinhing of dislocation lines by lattice defects which migrate to the dislocation line from the point at which they are originally produced through the Compton and photoelectrons resulting from the incident gamma rays. Comparison with previous work shows that for each primary displaced lattice atom only one eightieth as many pinning points result from the gamma ray bombardment as from bombardment with fast neutrons; this result is in satisfactory agreement with calculations of higher order displacements in the two cases.
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