National Geographic : 1958 Sep
Ultraviolet Light Bathes a Scientist Studying the Plastic Model of a Crystal Dr. Douglas S. Billington, of Oak Ridge, seeks new materials to withstand heat and radiation damage. Here he examines the crystal lattice of sodium chloride, or table salt. Circles of fluores cent paint, glowing in ultraviolet light, represent atoms of sodium (red) and chlorine (yellow). 322 Ground and polished, a uranium-carbon alloy reveals its structure in a photomicrograph. An acid bath brings out the colors: UC 2, dark; UC, light. Oak Ridge tests the material as a fuel.