[en] X-ray microradiography is used to make measurements of opaque metal and polymer coatings on hollow glass microspheres which are used as laser fusion targets at the Lawrence Livermore National Laboratory. Metal coatings include platinum, tantalum, gold, copper, and beryllium where thicknesses range from 1 to 10 mm on 70 to 200 mm diameter mandrels. Contact film images are made with x-ray energies from 1 to 50 keV, depending on the material and geometry. The recorded x-ray images show the internal structure of the coatings which is not observable with optical and SEM techniques. The film images are digitized and directly measured using a small computer-based image analysis system. Wall thicknesses and nonconcentricity can be measured to within 0.3 mm, and diameters to within 1.5 mm