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, Colorado which was formerly mined in Colorado in the early 20th century. . The Radium Recreation Site, part of the Upper Colorado River Special Recreation Management Area managed by the Bureau of Land Management, is on the south bank of the Colorado River across from the community. Radium Hot Springs is located on the river bank, a few miles south of Radium, and about 15 miles from Kremmling. Radium, Colorado Radium is a small rural unincorporated community in southwestern Grand County, Colorado, United States. The community sits in the mountains along an isolated stretch of Colorado River downstream from Gore Canyon