Radium Series - Actinide Alpha Decay Chains - Actinium Series

Actinium Series

The 4n+3 chain of uranium-235 is commonly called the "actinium series". Beginning with the naturally-occurring isotope U-235, this decay series includes the following elements: Actinium, astatine, bismuth, francium, lead, polonium, protactinium, radium, radon, thallium, and thorium. All are present, at least transiently, in any sample containing uranium-235, whether metal, compound, ore, or mineral. This series terminates with the stable isotope lead-207.

nuclide historic name (short) historic name (long) decay mode half-life
(a=year)
energy released, MeV product of decay
239Pu α 2.41·104 a 5.244 235U
235U AcU Actin Uranium α 7.04·108 a 4.678 231Th
231Th UY Uranium Y β− 25.52 h 0.391 231Pa
231Pa Protactinium α 32760 a 5.150 227Ac
227Ac Ac Actinium β− 98.62%
α 1.38%
21.772 a 0.045
5.042
227Th
223Fr
227Th RdAc Radioactinium α 18.68 d 6.147 223Ra
223Fr AcK Actinium K β− 99.994%
α 0.006%
22.00 min 1.149
5.340
223Ra
219At
223Ra AcX Actinium X α 11.43 d 5.979 219Rn
219At α 97.00%
β− 3.00%
56 s 6.275
1.700
215Bi
219Rn
219Rn An Actinon,
Actinium Emanation
α 3.96 s 6.946 215Po
215Bi β− 7.6 min 2.250 215Po
215Po AcA Actinium A α 99.99977%
β− 0.00023%
1.781 ms 7.527
0.715
211Pb
215At
215At α 0.1 ms 8.178 211Bi
211Pb AcB Actinium B β− 36.1 min 1.367 211Bi
211Bi AcC Actinium C α 99.724%
β− 0.276%
2.14 min 6.751
0.575
207Tl
211Po
211Po AcC' Actinium C' α 516 ms 7.595 207Pb
207Tl AcC" Actinium C" β− 4.77 min 1.418 207Pb
207Pb AcD Actinium D . stable . .

Read more about this topic:  Radium Series, Actinide Alpha Decay Chains

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