Abstract
We have measured the positron annihilation angular distribution in 1S Al subjected to neutron irradiation while part of the NRX reactor calandria, in annealed IS Al, and in heavily deformed 1S Al, which simulates the cold working of the calandria sample before irradiation. The FWHM in the calandria and deformed samples were found to be similar and 11% narrower than that in the annealed sample, indicating that the dominant defects in the calandria are dislocations rather than voids. Electron microscope examination of the above samples also indicated a high density of dislocations and no significant void population in the neutron irradiated calandria.
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