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Using a thin film detector to indicate nuclear charge Z from measured specific luminescence values, direct evidence was obtained for fragment nul. cear charge structure in the thermal neutron induced fission of 3 U. The structure, occuring as a preference for formation of alternate Z charge units, is most pronounced for fission events leading to higher total kinetic energy release. NUCLEAR REACTIONS, FISSION~U(n, f), E =thermal; measured coin thin-film detector (TFD) luminescence, E and V of 2~6U* single fragments; deduced Z fine structure in E and I distributions; confirmed heavy mass even-even periodicity at higher energies.