| slovo | definícia |
promethium
(encz) | promethium, |
promethium
(wn) | promethium
n 1: a soft silvery metallic element of the rare earth group
having no stable isotope; was discovered in radioactive
form as a fission product of uranium [syn: promethium,
Pm, atomic number 61] |
promethium
(elements) | promethium
Symbol: Pm
Atomic number: 61
Atomic weight: (147)
Soft silvery metallic element, belongs to the lanthanoids. Pm-147, the
only natural isotope, is radioactive and has a half-life of 252 years.
Eighteen radioisotopes have been produced, but all have very short
half-lives. Found only in nuclear decay waste. Pm-147 is of interest as
a
beta-decay source, however Pm-146 and Pm-148 have to be removed from it
first, as they generate gamma radiation. Discovered by J.A. Marinsky,
L.E. Glendenin and C.D. Coryell in 1947.
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