Abstract
A number of materials not necessarily destined for use in fast reactors, in which atomic displacements are the main damage mechanism under observation, are presently being irradiated in the Dounreay Fast Reactor. In this paper it is shown that, if it can be accepted that the ratio of atomic displacement rate in the test reactor to displacement rate in the parent reactor is an acceptable parameter for comparison purposes, then the atomic displacement energy and the electronic cut off energy of a material are not critical parameters in the derivation of this ratio. It is also shown that, if the equivalent fission flux concept is used to describe reactor spectra, it can lead to appreciable errors in deriving the damage ratio, but that integration over the real spectrum is unnecessary below about 0·1 MeV.
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