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Near surface and bulk radiation enhanced self-diffusion of Ni
0.3
in nickel was measured after irradiations with 2 MeV electrons. In the temperature range between 550 and 800°K the bulk diffusion coefficient is D
Rad
= 1.347 × 10
−12
exp (-0.41/kT cm
2
/s) for a flux of 20 μA/cm
2
. The measured diffusion coefficients are at least two orders of magnitude larger than those predicted by theories based either on the one- or the two- interstitial model. This discrepancy between experiment and theory is resolved for the two-interstitial model by considering the interactions between sell-interstitials and vacancies during their life times. These interactions led to an effective migration energy of self-interstitials of E
M
eff
, = 0.82 eV. which is smaller than E
M
= 1.0 eV. The experimental data can be described by D
Rad
α
2
n
f(Kv
ell
1
)
1
2
.
Radiation enhanced diffusion data obtained in other laboratories for gold in gold. silver in silver, for copper and for gold in aluminium arc analysed and results analogous to nickel are found.