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Radioluminescent paint is a self-luminous paint that consists of a small amount of a radioactive isotope (radionuclide) mixed with a radioluminescent phosphor chemical. The radioisotope continually decays, emitting radiation particles which strike molecules of the phosphor, exciting them to emit visible light.
The invention of black light paint is attributed to brothers Joseph and Robert Switzer in the 1930s. After a fall, Robert suffered a severe head injury that resulted in a severed optic nerve. His doctor confined him to a dark room while he waited for his sight to recover.
Radioluminescence is used as a low level light source for night illumination of instruments or signage. Radioluminescent paint is occasionally used for clock hands and instrument dials, enabling them to be read in the dark. Radioluminescence is also sometimes seen around high-power radiation sources, such as nuclear reactors and radioisotopes.
In Bloomsburg, it continued to produce items with luminescent paint using radium, strontium-90 and cesium-137 such as watch dials, instrument gauge faces, deck markers, and paint. [8] It ceased radium processing altogether in 1968, spinning off those operations as Nuclear Radiation Development Corporation, LLC, based in Grand Island, New York.
Radium was used to make self-luminous paint from the early 20th century to about 1970. Promethium briefly replaced radium as a radiation source. Tritium is the only radiation source used in radioluminescent light sources today due to its low radiological toxicity and commercial availability.
The "Top 100 Greatest Films of All Time" is a list published every ten years by Sight and Sound according to worldwide opinion polls they conduct. They published the critics' list, based on 1,639 participating critics, programmers, curators, archivists and academics, and the directors' list, based on 480 directors and filmmakers.
The grey skies and 50 degree weather in Richmond did little to detract from the enthusiasm in the crowd as Trump supporters in red “Make America Great Again” hats and T-shirts showed up in ...
Sight & Sound Theatres is an entertainment company that produces Bible stories live on stage. Based in Lancaster County, Pennsylvania, Sight & Sound operates two theaters: one in Ronks, Pennsylvania (formerly known as the Millennium Theatre) and the second in Branson, Missouri. Each year, more than a million people from around the world attend ...
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