radium
Kelime Anlamı :
1. radyum.
2. radium therapy radiotherapy.
3. radium paint radyumlu boya.
4. (ra) radyum.
5. (isim) radyum.
6. i., kim. radyum.
7. Pa sembolü ile bilinen, atom no: 88 ve atom ağırlığı: 226.05 olan kimyasal element, radyum.
Tanımlar :
1.
A rare, brilliant white, luminescent, highly radioactive metallic element found in very small amounts in uranium ores, having 13 isotopes with mass numbers between 213 and 230, of which radium 226 with a half-life of 1,622 years is the most common. it is used in cancer radiotherapy, as a neutron source for some research purposes, and as a constituent of luminescent paints. atomic number 88; melting point 700°C; boiling point 1,737°C; valence 2. see table at element.
from The American Heritage® Dictionary of the English Language, 4th Edition
1.
a radioactive metallic chemical element (symbol ra) with an atomic number of 88.
from Wiktionary, Creative Commons Attribution/Share-Alike License
1.
an intensely radioactive metallic element found (combined) in minute quantities in pitchblende, and various other uranium minerals. symbol, ra; atomic weight, 226.4. radium was discovered by M. and mme. curie, of paris, who in 1902 separated compounds of it by a tedious process from pitchblende. its compounds color flames carmine and give a characteristic spectrum. it is divalent, resembling barium chemically. the main isotope of radium found in pitchblende, radium-226, has a half-life of 1620 years, decaying first by alpha emission to radon.
from the GNU version of the Collaborative International Dictionary of English