Radium — (pronEng|ˈreɪdiəm) is a radioactive chemical element which has the symbol Ra and atomic number 88. Its appearance is almost pure white, but it readily oxidizes on exposure to air, turning black. Radium is an alkaline earth metal that is found in… … Wikipedia
Radium — Ra di*um (r[=a] d[i^]*[u^]m), n. [NL., fr. L. radius ray.] (Chem.) An intensely radioactive metallic element found (combined) in minute quantities in pitchblende, and various other uranium minerals. Symbol, Ra; atomic weight, 226.4. Radium was… … The Collaborative International Dictionary of English
Radium Dial Company — The now defunct Radium Dial Company, was one of a few 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.… … Wikipedia
radium — /ray dee euhm/, n. 1. Chem. a highly radioactive metallic element whose decay yields radon gas and alpha rays. Symbol: Ra; at. wt.: 226; at. no.: 88. 2. a lustrous rayon or silk fabric constructed in plain weave and used in women s apparel,… … Universalium
Radium Girls — The Radium Girls were women subjected to radiation exposure at the United States Radium Corporation factory, in Orange, New Jersey around 1917. The five female workers gained notoriety for their efforts in challenging their employer in court. The … Wikipedia
United States Radium Corporation — The United States Radium Corporation was a company operated between the years 1917 to 1926 in Orange, New Jersey, in the United States. After initial success in developing a Glow in the dark radioactive paint, the company closed in the late 1920s … Wikipedia
Undark — was a trade name for luminous paint made with a mixture of radioactive radium and zinc sulfide, as produced by the U.S. Radium Corporation between 1917 and 1938. It was used primarily in watch dials. The people working in the industry who applied … Wikipedia
Operation Sandblast — Part of Cold War (1953–1962) … Wikipedia
radiation — radiational, adj. /ray dee ay sheuhn/, n. 1. Physics. a. the process in which energy is emitted as particles or waves. b. the complete process in which energy is emitted by one body, transmitted through an intervening medium or space, and… … Universalium
Mesothorium — Mes o*tho ri*um, n. [NL.; meso + thorium.] (Chem.) a radioactive isotope of radium (radium 228) with a half life of 5.8 years. Also called {mesothorium 1} or {mesothorium I} to distinguish it from a subsequent decay product, mesothorium II… … The Collaborative International Dictionary of English
