Figure 6. Axial distribution profile of some fission products in the capsule with the zirconia-based pellets (measuring time 250 seconds per step, stepsize 0.4 mm). The large negative spikes coincide the gaps  between the pellets. Clearly Cs has moved from the hot core to the cooler outer surface. The minor depressions coincide with the location of the mid-pellet cracks.


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