The Probert Encyclopaedia of Science & Technology

TRITIUM

Tritium is an unstable isotope of hydrogen. Tritium is radioactive, but considered safer than radium as it is thought that the rays emitted by tritium are unable to penetrate the outer layer of skin on human tissue, or even a thin layer of glass. Tritium replaced radium in luminous paints used for watch dials and the like.
Research Tritium