H Home Background Color: He Li Be Actinium Main Page Black White Gray B C N O F Ne Na Mg Actinium Pictures Page Al Si P S Cl Ar K Ca Actinium Technical Data Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs Ba La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Fr Ra Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og

Isotopes of Actinium (click to see decay chain): 206Ac  207Ac  208Ac  209Ac  210Ac  211Ac  212Ac  213Ac  214Ac  215Ac  216Ac  217Ac  218Ac  219Ac  220Ac  221Ac  222Ac  223Ac  224Ac  225Ac  226Ac  227Ac  228Ac  229Ac  230Ac  231Ac  232Ac  233Ac  234Ac  235Ac  236Ac

226Ac     Half-life Fermion, 89p 137n 1.22337962963 d Spin 1 Parity -1 Hide Decay Modes Probability Mode Decay Energy Daughter 83% β- 1.11315MeV 226Th 17% ϵ 641.11keV 226Ra 0.006% α 5.536MeV 222Fr Hide Ultimate Decay Products Yield Nuclide 100.0136181341% 206Pb 3.2136426×10-7% 205Tl 2.534647368×10-8% 208Pb Atomic Weight 226.026098089 Abundance None Mass Excess 24.310214MeV Binding Energy 7.655658MeV Magnetic Moment N/A Quadrupole Moment N/A   Show Element Pictures. Also show decay chains leading to this isotope. Show all decays, even very low-probability.

Click any isotope in diagram to see its data. Decay chain image generated by Mathematica's GraphPlot and IsotopeData functions from Wolfram Research, Inc..