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 Gilbert Radium Gilbert The Radium Gilbert was a tugboat built for transporting supplies to, and ore from, the radium and uranium mines in Canada's Northwest Territories. Like the other tugs in the Radium Line she was steel-hulled. She was named after Gilbert Labine, the prospector who discovered radioactive ore where Port Radium was built. She was built in Vancouver, in 1946 disassembled, so she could be shipped by rail to Waterways, Alberta. Like all vessels assembled in Waterways that operated on the Mackenzie River, and its tributaries, after she was reassembled she first proceeded downstream to Lake Athabasca, and down the