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RADIUM: LUMINOUS (GLOW-IN-THE-DARK) WATCH (2 of 2)
Phosphorescence A Form Of Luminescence
(Viewed in Darkness) The hands & numbers contain minute amounts of radium salt. The radioactive decay of radium causes the watch to glow in the dark. Phosphorescence is luminescence which continues after the radiation causing it ceases.
Copyright:© 1990 Richard Megna - Fundamental Photographs
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