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L. R. Zumwalt, P. E. Gethard, E. E. Anderson
Nuclear Science and Engineering | Volume 21 | Number 1 | January 1965 | Pages 1-12
Technical Paper | doi.org/10.13182/NSE65-A21008
Articles are hosted by Taylor and Francis Online.
The fission-product release of spherical monogranular UC2 particles is studied by postirradiation annealing of neutron-activated samples and by exposing samples to a steady rate of photofission. The release of the several fission products studied appears to follow the kinetics and temperature-dependence of an activated diffusional process. The anomalous fast release of a portion of the Xe133 in annealing experiments may be interpreted as being due to release of attached or trapped xenon atoms by a process not following Fick's law. Analysis of the data obtained gives the following diffusion coefficients for krypton, tellurium, iodine, xenon and barium in UC2 (in cm2/sec): The diffusion coefficient for xenon in UC2 shows agreement with the diffusion coefficient for xenon in UO2. A negative activation entropy (-13 eu) for diffusion is indicated.
