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 Girls from the concern, Kelly established a competing firm in the town named Luminous Process Company, which also employed women in the same fashion, and in the conditions as the other firms. Employees at Radium Dial began showing signs of radium poisoning in 1926-1927, and were unaware of the hearings and trials in New Jersey. Furthermore, Radium Dial leadership authorized physicals and other tests designed to determine the toxicity of its employees, but the company never turned those records to the employees or told them of the results. In a half-hearted attempt to end the use of the camel hair brushes,