A study of nuclear materials by neutron scattering

Twelve experimental pole figures were measured by neutron scattering method for six metallic uranium rods with different manufacturing processes, and their results were not fiber texture. An average fiber texture was obtained for each sample by rotating the sample around the fiber axis(5-6 rev./min.). TEXFBI computer code for theoretical analysis of texture type of orthorhombic crystal materials has been developed by Bunge's series expansion and Roe's iteration methods, and errors (deltaP) between experimental and calculated pole figures for hot-drawned metallic uranium rod with 95% total area reduction were about 2% when the above eight figures (I=8, L=12) were used. By TEXFBI, qsub(ij) values were calculated in the error of about 0.5%, and for background correction about 2-30% variation in the experimental pole density distribution can be seen. And also, background correction deltasub(i) was required for 0DF calculation of texture because of the compatibility of the different pole figures. For studying irradiation growth of the metallic uranium by neutron radiation and thermal expansion it was recommanded to develope texture along [100], [010] and [001] crystal directions, respectively. In these results, the accurate measurement and the theoretical analysis of texture are very important to develope new material, and particularly to study reactor materials (fuel, graphite and zircaloy, etc.) related to the nuclear safety. (Author)