Isotopes of rutherfordium

Isotopes of rutherfordium (104Rf)
Main isotopes Decay
abun­dance half-life (t1/2) mode pro­duct
261Rf synth 2.1 s SF82% –
α18% 257No
263Rf synth 15 min SF<100%? –
α~30%? 259No
265Rf synth 1.3 min SF –
267Rf synth 48 min SF –

Rutherfordium (104Rf) is a synthetic element and thus has no stable isotopes. A standard atomic weight cannot be given. The first isotope to be synthesized was either 259Rf in 1966 or 257Rf in 1969. There are 17 known radioisotopes from 252Rf to 270Rf (three of which, 266Rf, 268Rf, and 270Rf, are unconfirmed) and several isomers. The longest-lived isotope is 267Rf with a half-life of 48 minutes, and the longest-lived isomer is 263mRf with a half-life of 8 seconds.

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