Radium
The element that made radioactivity famous, and whose consequences wrote much of modern radiation law.
Radium was separated from uranium ore by the Curies, from tonnes of residue, and it glows — faintly, continuously, without being lit. That single visible fact made radioactivity a public phenomenon rather than a laboratory one, and radium was put into paint, tonics, cosmetics and clocks.
It is chemically a heavier relative of calcium, which is precisely the problem: the body treats it as calcium and files it in bone, where it stays and irradiates the marrow.
History
Radium's most consequential legacy is the women who painted luminous watch dials and shaped their brushes with their lips. The resulting jaw and bone disease was traced to the paint, and the litigation that followed established that an employer could be liable for occupational disease with a long latency.
That principle, and the radiation protection standards built afterwards, outlasted every industrial use of the element itself.
Uses
Radium has essentially no current use. Luminous paint was replaced by phosphors excited by far safer isotopes, and radium's early role in cancer treatment was taken over by cobalt sources and then by machines that produce radiation only while switched on — a decisive advantage over a substance that cannot be turned off.
How we know: checked recently · only one source, so there is nothing to cross-check it against · stated directly by the source.
How this connects
Where a connection has been confirmed by an outside reference, that reference is named beside it.
Sources
- Material WorldOur own writing
- Wikimedia Foundation · Creative Commons CC0 1.0 Universal (public domain dedication)
- US National Library of Medicine · Mixed — aggregated third-party content, rights retained by depositors