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Radium: Distribution, Cost and Manufacture
The subject of radium presents considerable interest to physicians in general and to American physicians in particular. A chemical engineer recently published an article on radium, from which I take these excerpts: Although radium is found in many parts of the world (for example, in Bohemia, Portugal, Australia and England), the United States has been until recently the chief producer. It is estimated that at present there is in use in the United States 150 gm. of radium, worth approximately $20,000,000, around 90 per cent, of which was derived from the carnotite deposits of Colorado. This American radium ore contains about 2 per cent, uranium oxid and is found interstratified with the rocks, from which it is extracted by diamond drills. It is sorted by hand and is transported by mule teams to a distant railway. Since the deposits of radium ore are widely scattered,
BERLIN. JAMA. 1923;81(18):1538–1539. doi:10.1001/jama.1923.02650180056027