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2014 ANNUAL REPORT 117 Figure 5. a Misorientation distribution of grain boundaries in Area B sample IE from particle AGR1-632-035. b A breakdown of grain boundary types 4. errors in orientation as determined by ASTAR.A plot of the misorientation angle distribution for grain bound- aries in Area B is shown in Figure 5a while the pie-chart in Figure 5b provides the relative fractions of the various types of grain boundaries in the scanned area.As mentioned the low-angle grain boundary fraction is very low.The misorientation distribu- tion of the high-angle grain bound- aries is centered around 35 degrees with a large fraction observed at 60 degrees which corresponds to the twin orientation. The large fraction of CSL-related grain boundaries indicated in Figure 5 b consist mostly of twins and higher-order twins e.g.3 699 10 and 27a and 27b 14.The remainder of the CSL-related boundaries consist of one 13a 3 and one 35a 3. Only 17 of the grain boundaries in the analyzed area have fission products associated with them.A summary of these boundaries is provided in Table 2 where both the boundary crystallography and the associated fission products are detailed. Only one CSL-related grain boundary exhibited the presence of a fission product that was exclusively palladium Pd. The rest of the boundaries with fission products are random high- angle grain boundaries containing only Ag PdAg or Pduranium U. However the uniqueness of the CSL- related boundary containing fission products is questionable considering its high value 35. Only one in 35 lattice sites between the two grains are coincident with a 35 CSL-related grain boundary. If this boundary lacks any special qualities relative to the other high-angle boundaries in Table 2 it can be concluded that fission products are only associated with random high-angle grain boundaries. Pd is the most prevalent fission product. It was found exclusively in five grain boundaries.Ag was found alone in only two grain boundaries and with Pd in one. U was not found alone and was associated with Pd in only one grain boundary. Only about 39 of the high- angle grain boundaries exhibited any presence of fission products at all.Thus some other parameter would seem to strongly influence the precipitation of fission products even in high-angle grain boundaries. All grain boundaries analyzed in sample IECtr and OEThe character- istics of 929 grain boundaries were determined in all the areas analyzed in samples IE Ctr and OE Figure 4. Full interpretation is in progress with reports or papers being prepared. Figures 6 and 7 show some of the collective results on all grain boundaries analyzed. It was found that 45.1 of all grain boundaries consist of high-angle boundaries that are not CSL bound- aries 49.2 are CSL boundaries and only 5.7 are low-angle boundaries Figure 6. Of all the boundaries analyzed only 11.1 contain fission products.The grain boundary type distributions are presented in Figure 7. Only 6.0 of the boundaries containing fission products contain Ag and Pd 14.3 contain only Ag 17.9 contain Pd and U and the remaining 61.9 contain only Pd.The 14.3 of grain boundaries containing only Ag are all high-angle grain boundaries while the grain boundaries containing