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The radium isotope (226 Ra) used has a half-life of about 1,600 years, [7] so radium dials remain essentially just as radioactive as when originally painted 50 or 100 years ago, whether or not they remain luminous. Radium dials held near the face have been shown to produce radiation doses in excess of 10 μSv / hour.
Radium dial painters were instructed in proper safety precautions and provided with protective gear; in particular, they no longer shaped paint brushes by lip and avoided ingesting or breathing the paint. Radium paint was still used in dials as late as the 1970s. [27] The last factory manufacturing radium paint shut down in 1978. [28]
Radium's long half-life of 1600 years means that surfaces coated with radium paint, such as watch faces and hands, remain a health hazard long after their useful life is over. There are still millions of luminous radium clock, watch, and compass faces and aircraft instrument dials owned by the public.
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.
The Radium Dial Company was one of a few now defunct United States companies, along with the United States Radium Corporation, involved in the painting of clocks, watches and other instrument dials using radioluminescent paint containing radium. The resulting dials are now collectively known as radium dials.
Radium Dial, the company that hires the women to do the painting, tells them that there is no evidence that radium is harmful, and even that it has health benefits. After a period of time, the workers notice that their hands start glowing in the dark, but assume that it is just from the radium powder that is used to paint the faces.
A 1950s radium clock, exposed to ultraviolet light to increase luminescence. Radioluminescent paint was invented in 1908 by Sabin Arnold von Sochocky [3] [failed verification – see discussion] and originally incorporated radium-226. Radium paint was widely used for 40 years on the faces of watches, compasses, and aircraft instruments, so they ...
Grace Fryer (14 March 1899 – 27 October 1933) [1] was an American dial painter and Radium Girl, [2] who sued U.S. Radium after suffering radium poisoning while employed painting watch faces. [3] Subsequently, joined by fellow workers Quinta McDonald, Albina Larice, Edna Hussman, and Katherine Schaub, Fryer brought a suit labelled in the media ...
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