Flux (Dose Rate) Effects for 2.8 MeV 58Ni Irradiations of Pure Ni
Five years ago a phenomenon now known as swelling was found1 to occur in reactor materials under prolonged intense neutron irradiation. This swelling, which may represent a 10% or greater volume change, results from condensation of vacancies to form voids. The void formation presents severe limits on possibilities for advanced nuclear reactors. Subsequently it was found that this swelling could be simulated, at least qualitatively, by bombardment with heavy ions in a small fraction of the time required with neutron irradiation. Two conferences2,3 have summarized early work of this type. However, the higher (103 –105 times) production rate of the initial damage which makes simulation feasible may also obscure subtle microstructural changes. Thus, the dose rate effects need to be understood. Qualitative theoretical predictions of these effects have been made.4,5 The purpose of the present experiment was to obtain two quantitative curves of swelling versus irradiation temperature in pure nickel where flux (dose rate) is the only variable. That is, the flux was varied by a factor of 100 while the bombarding projectile, its energy, and the total fluence of incident ions was maintained the same. Comparisons are made between experimental results and the theoretically predicted effects of flux on swelling.
KeywordsDose Rate Spot Welding High Dose Rate Nickel Foil Dose Rate Effect
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