Isotopes of astatine

Isotopes of astatine (85At)
Main isotopes Decay
Isotope abun­dance half-life (t1/2) mode pro­duct
207At synth 1.81 h β+90% 207Po
α10% 203Bi
208At synth 1.63 h β+99.5% 208Po
α0.55% 204Bi
209At synth 5.41 h β+96.1% 209Po
α3.9% 205Bi
210At synth 8.1 h β+99.8% 210Po
α0.175% 206Bi
211At synth 7.214 h ε58.2% 211Po
α41.8% 207Bi

Astatine (85At) has 41 known isotopes, all of which are radioactive, whose mass numbers range from 188 to 229 except 189; they are accompanied by almost as many metastable excited states. The longest-lived isotope is 210At, which has a half-life of 8.1 hours, followed by the medically useful 211At, with a half-life of 7.214 hours. The longest-lived isomer is 202m1At with a half-life of just over 3 minutes. However, the longest-lived isotope existing in naturally occurring decay chains is 219At with a half-life of only 56 seconds.

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