Abstract
C 60 and endohedral 165 Ho metallofullerenes were irradiated under various neutron flux conditions to maximize the activity of surviving 166 Ho metallofullerenes. C 60 survived irradiation to a fairly high extent (>80%) at fluences of <10 18 n cm −2 (75.8% thermal), but fast-neutron damage (or equivalent oxidative decomposition) progressed rapidly at higher fluences. Under identical conditions the metallofullerenes were degraded more quickly and extensively than was C 60, and decomposition proceeded primarily by fast-neutron damage instead of anticipated (n, γ)-metal recoil. Irradiation under more thermal neutron flux conditions (96.2% and 99.8%) significantly improved metallofullerene survival (20–30%), and degradation was demonstrated to proceed through the metal-recoil pathway.
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