Promethium

History
 
Prometheus is an artificial metal not transuran origin, obtained in 1945. In nature, metal formed by the radioactive decay of nuclei of heavy elements. In 1947 American researchers Mari, Glendenin and Koriell found Promethium  in products produced in nuclear reactors.

Nowadays

Basically Prometeus used for research purposes. It can be used as a source of beta radiation in luminous paint, into nuclear batteries for missiles, clock, pacemaker and radio, as well as a light source for signals. Perhaps in the future Promethium can be used as a portable source of X-ray waves. The bulk of the metal is going for the production of radioisotope power sources.