The results presented in this paper show that powder, particles, and pellets of ^^^PuOg undergo oxygen isotope exchange to form ^^^Fu^^Os. Solid-solution ThOs-PuOg also undergoes oxygen exchange to yield a fuel form with a low neutron flux. The experimental conditions which give best exchange results involve exchange and sintering at or above 1400°C. The rate data show that to completely exchange particles of PuOg in a period of time less than 1 hr temperatures in excess of 1300°C will be required. Pellets which have been sintered near 1600°C for several hours also exchange very slowly due to the presence of a diffusion-controlled reaction. The oxygen exchange of ^^^PuOg using a flowing gas system is also described.
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