- Nuclear fuel - Radioactive element - Yellowcake product - An element of the chromium group, found in certain rare
minerals, as pitchblende, uranite, etc., and reduced as a heavy, hard,
nickel-white metal which is quite permanent. Its yellow oxide is used
to impart to glass a delicate greenish-yellow tint which is accompanied
by a strong fluorescence, and its black oxide is used as a pigment in
porcelain painting. Symbol U. Atomic weight 239.
- Radioactive element - A metallic element found in certain rare minerals, as
thorite, pyrochlore, monazite, etc., and isolated as an infusible gray
metallic powder which burns in the air and forms thoria; -- formerly
called also thorinum. Symbol Th. Atomic weight 232.0.