Radium seventh of a gram of radium. One kilogram of the Earth's crust contains about 900 picograms of radium, and one liter of sea water contains about 89 femtograms of radium. Radium was discovered by Marie Sklodowska-Curie and her husband Pierre Curie on 21 December 1898, in a uraninite (pitchblende) sample. While studying the mineral earlier, the Curies removed uranium from it and found that the remaining material was still radioactive. They separated out an element similar to bismuth from pitchblende in July 1898, that turned out to be polonium. They then separated out a radioactive mixture consisting mostly of two
Radium Hill Radium Hill Radium Hill is a former minesite in South Australia which operated from 1906 until 1961. It was Australia's first uranium mine, years before the country's next major mines at Rum Jungle in the Northern Territory (opened in 1950), and the Mary Kathleen mine in Queensland (1958). The associated settlement which once housed up to 1,100 people is now a ghost town, largely abandoned and demolished. The former townsite and cemetery were provisionally listed on the South Australian Heritage Register on 24 August 2016. During its main period of production between 1954 and 1961 the mine produced nearly 1