The bias factor for swelling was determined from data on the microstructures of pure V, and alloys, which had been bombarded with 50keV 51V+ ions at 450, 560 or 625C to up to 40dpa (0.005dpa/s). It was found that the bias factor increased from about 1 to about 6%, as the square of the Fe concentration, and depended slightly upon the temperature and dose. It was shown that a strong bias factor dependence upon Fe concentration could be obtained by assuming that radiation-induced segregation of Fe atoms affected the void bias but not the dislocation bias. That is, if radiation-induced segregation did not follow rapidly climbing dislocations.

J.V.Konobeev, V.A.Pechenkin, S.I.Rudnev: Journal of Nuclear Materials, 1996, 233-237B, 1070-5