  Among extinct radioactivities present in meteorites, 60Fe (t1/2 = 1.49 Myr)
plays a key role as a high-resolution chronometer, a heat source in
planetesimals, and a fingerprint of the astrophysical setting of solar system
formation. A critical issue with 60Fe is that it could have been
heterogeneously distributed in the protoplanetary disk, calling into question
the efficiency of mixing in the solar nebula or the timing of 60Fe injection
relative to planetesimal formation. If this were the case, one would expect
meteorites that did not incorporate 60Fe (either because of late injection or
incomplete mixing) to show 60Ni deficits (from lack of 60Fe decay) and
collateral effects on other neutron-rich isotopes of Fe and Ni (coproduced with
60Fe in core-collapse supernovae and AGB-stars). Here, we show that measured
iron meteorites and chondrites have Fe and Ni isotopic compositions identical
to Earth. This demonstrates that 60Fe must have been injected into the
protosolar nebula and mixed to less than 10 % heterogeneity before formation of
planetary bodies.
