Henri D. Petit has been named a senior vice president of Eastman Kodak Co. Petit is chairman and president of Kodak's Greater Asia Region.   . . .   Pacific Nanotechnology Inc., a Santa Clara, Calif.-based maker of atomic force microscopes (AFMs), announced it has shipped an enhanced Nano-R AFM system for R&D and industrial lab environments.   . . .   Radiant Imaging Inc. announced it will move to a new building in Duvall, Wash., on April 25. The new plant, which is under construction, is about twice as large as the company's existing facility for manufacturing display metrology and light source characterization products. It will include an upgraded applications lab for developing custom metrology solutions for display applications. Radiant Imaging said it subsequently plans to increase personnel in all of its departments.