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 (horse) campdrafting without a bridle. In circa 1928, Radium was sold to Herb O’Neil, who, as a friend of Donald Beaton, had ridden the horse in competitions for Beaton when he had been unable to get away from his property. Herb O’Neill competed extensively with Radium, winning over a large area of the state. Just prior to the Second World War (WWII), Radium won a Championship Campdraft at Kempsey, New South Wales with the next ten placings going to Radium’s sons and daughters. Radium was also highly successful in led contests for the best type of Stock Horse. During WWII, at