Abstract
Experiments have been carried out to measure vacancy concentrations, interstitial clusters, and dimensional changes in single crystals of graphite bombarded by neutrons and carbon ions. Bombardment temperatures varied from 20°C to 1300°C. The variations of defect concentrations with temperature, displacement rate, and total displacements per lattice site are only partly understandable in terms of the present model of radiation damage in graphite. The studies of dimensional change show that single crystal graphite is very stable under irradiation at high temperature. In contrast to the extensive literature describing the effects of neutron irradiation on the properties of polycrystalline graphites, there are relatively few reports of work on pure single crystal material. The experiments described in this paper are of the latter type.
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