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Reference



Radioactive Elements and Isotopes
Chemical Properties, Physical Properties and General Information


Name Sym. Atomic
Number
Atomic
Weight
Occurrence
Useful Isotopes Use & Applications
Technetium Tc 43 98 Synthetic 99mTc (nuclear medicine)
Promethium Pm 61 145 Synthetic 145Pm (radiation source for thickness gauges); 147Pm (nuclear batteries)
Polonium Po 84 209 From Decay 210Po (nuclear weapons, thermoelectricity)
Astatine At 85 210 Synthetic none
Radon Rn 86 222 From Decay 222Rn (cancer radiation therapy, hydrologic research)
Francium Fr 87 223 From Decay none
Radium Ra 88 226 From Decay 226Ra (formerly used for treatment of cancer and other diseases, self-luminous paints, neutron sources)
Actinium Ac 89 227 From Decay 225Ac (neutron source, radio-immunotherapy)
Thorium Th 90 232.03806 Primordial 232Th (alloying in magnesium, Welsbach mantles, nuclear fuel, dating)
Protactinium Pa 91 231.03588 Synthetic none
Uranium U 92 238.02891 Primordial 235U, 238U (nuclear energy & weapons)
Transuranium Elements
Neptunium Np 93 237 From Decay 237Np (precursor in Pu-238 production for spacecraft and military)
Plutonium Pu 94 244 From Decay 239Pu (nuclear weapons) 238Pu (electrical power)
Americium Am 95 243 Synthetic 241Am (gamma radiography, glass thickness gauge, smoke detectors); 242Am (neutron radiography)
Curium Cm 96 247 Synthetic 242Cm, 244Cm (possible uses as a thermoelectric power source)
Berkelium Bk 97 247 Synthetic none
Californium Cf 98 251 Synthetic 252Cf (gold and silver ores identification, neutron moisture gauges to find water and oil bearing layers in oil wells)
Einsteinium Es 99 252 Synthetic none
Fermium Fm 100 257 Synthetic none
Mendelevium Md 101 258 Synthetic none
Nobelium No 102 259 Synthetic none
Lawrencium Lr 103 262 Synthetic none
Rutherfordium Rf 104 261 Synthetic none
Dubnium Db 105 262 Synthetic none
Seaborgium Sg 106 266 Synthetic none
Bohrium Bh 107 264 Synthetic none
Hassium Hs 108 277 Synthetic none
Meitnerium Mt 109 268 Synthetic none
Darmstadtium Ds 110 271 Synthetic none
Roentgenium Rg 111 272 Synthetic none
Copernicium Cn 112 285 Synthetic none
Ununtrium Uut 113 284 Synthetic none
Ununquadium Uuq 114 289 Synthetic none
Ununpentium Uup 115 288 Synthetic none
Ununhexium Uuh 116 292 Synthetic none
Ununseptium Uus 117 294 ? Synthetic none
Ununoctium Uuo 118 294 Synthetic none


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Last updated: April 2011
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