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Actinium Isotopes






Proton number: 89


Stable Isotopes

There is no Actinium Stable isotopes known

Natural Radioactive isotopes

There is no Actinium Natural Radioactive isotopes known

Artificial Radioactive isotopes


Actinium radioactive isotope number 1: 206Ac
Neutrons: 117;
Jn: 3+;
Decay: α : 100.00 %;
t1/2: 0.022s ≈ 22.00 ms;

Actinium radioactive isotope number 2: 206Ac
Neutrons: 117;
Jn: 10-;
Decay: α : 100.00 %;
t1/2: 0.033s ≈ 33.00 ms;

Actinium radioactive isotope number 3: 206Ac
Neutrons: 117;
Jn: Unknown;
Decay: α : 100.00 %;
t1/2: 0.011s ≈ 11.00 ms;

Actinium radioactive isotope number 4: 207Ac
Neutrons: 118;
Jn: 9/2-;
Decay: α;
t1/2: 0.027s ≈ 27.00 ms;

Actinium radioactive isotope number 5: 208Ac
Neutrons: 119;
Jn: 3+;
Decay: ε : 1.00 %
α;
t1/2: 0.095s ≈ 95.00 ms;

Actinium radioactive isotope number 6: 208Ac
Neutrons: 119;
Jn: 10-;
Decay: IT < 10.00 %
ε : 1.00 %
α;
t1/2: 0.025s ≈ 25.00 ms;

Actinium radioactive isotope number 7: 209Ac
Neutrons: 120;
Jn: 9/2-;
Decay: α ~ 99.00 %
ε ~ 1.00 %;
t1/2: 0.1s ;

Actinium radioactive isotope number 8: 210Ac
Neutrons: 121;
Jn: Unknown;
Decay: α : 91.00 %
ε ~ 9.00 %;
t1/2: 0.35s ;

Actinium radioactive isotope number 9: 211Ac
Neutrons: 122;
Jn: Unknown;
Decay: α ~ 100.00 %;
t1/2: 0.21s ;

Actinium radioactive isotope number 10: 212Ac
Neutrons: 123;
Jn: Unknown;
Decay: α ~ 57.00 %
ε ~ 43.00 %;
t1/2: 0.93s ;

Actinium radioactive isotope number 11: 213Ac
Neutrons: 124;
Jn: Unknown;
Decay: α ≤ 100.00 %;
t1/2: 0.731s ;

Actinium radioactive isotope number 12: 214Ac
Neutrons: 125;
Jn: Unknown;
Decay: α ≥ 89.00 %
ε ≤ 11.00 %;
t1/2: 8.2s ;

Actinium radioactive isotope number 13: 215Ac
Neutrons: 126;
Jn: 9/2-;
Decay: α : 99.91 %
ε : 0.09 %;
t1/2: 0.17s ;

Actinium radioactive isotope number 14: 216Ac
Neutrons: 127;
Jn: 1-;
Decay: α : 100.00 %;
t1/2: 0.00044s ≈ 0.44 ms;

Actinium radioactive isotope number 15: 217Ac
Neutrons: 128;
Jn: 9/2-;
Decay: α ~ 100.00 %
ε ≤ 2.00 %;
t1/2: 6.9E-08s ≈ 69.00 ns;

Actinium radioactive isotope number 16: 218Ac
Neutrons: 129;
Jn: 1-;
Decay: α : 100.00 %;
t1/2: 1.08E-06s ≈ 1.08 µs;

Actinium radioactive isotope number 17: 219Ac
Neutrons: 130;
Jn: 9/2-;
Decay: α : 100.00 %;
t1/2: 1.18E-05s ≈ 11.80 µs;

Actinium radioactive isotope number 18: 220Ac
Neutrons: 131;
Jn: 3-;
Decay: α : 100.00 %
ε : 5.0E-4 %;
t1/2: 0.0264s ≈ 26.40 ms;

Actinium radioactive isotope number 19: 221Ac
Neutrons: 132;
Jn: Unknown;
Decay: α : 100.00 %;
t1/2: 0.052s ≈ 52.00 ms;

Actinium radioactive isotope number 20: 222Ac
Neutrons: 133;
Jn: 1-;
Decay: α : 99.00 %
ε : 1.00 %;
t1/2: 5s ;

Actinium radioactive isotope number 21: 222Ac
Neutrons: 133;
Jn: Unknown;
Decay: α ≥ 88.00 %
IT ≤ 10.00 %
ε ≥ 0.70 %;
t1/2: 63s ;

Actinium radioactive isotope number 22: 223Ac
Neutrons: 134;
Jn: 5/2-;
Decay: α : 99.00 %
ε : 1.00 %;
t1/2: 126s ≈ 2.10 m;

Actinium radioactive isotope number 23: 224Ac
Neutrons: 135;
Jn: 0-;
Decay: ε : 90.90 %
α : 9.10 %
β - < 1.60 %;
t1/2: 10008s ≈ 2.78 h;

Actinium radioactive isotope number 24: 225Ac
Neutrons: 136;
Jn: 3/2-;
Decay: α : 100.00 %
14C : 5E-10 %;
t1/2: 864000s ≈ 10.00 d;

Actinium radioactive isotope number 25: 226Ac
Neutrons: 137;
Jn: 1;
Decay: β - : 83.00 %
ε : 17.00 %
α : 6.0E-3 %;
t1/2: 105732s ≈ 29.37 h;

Actinium radioactive isotope number 26: 227Ac
Neutrons: 138;
Jn: 3/2-;
Decay: β - : 98.62 %
α : 1.38 %;
t1/2: 686601800s ≈ 21.77 y;

Actinium radioactive isotope number 27: 228Ac
Neutrons: 139;
Jn: 3+;
Decay: β - : 100.00 %;
t1/2: 22140s ≈ 6.15 h;

Actinium radioactive isotope number 28: 229Ac
Neutrons: 140;
Jn: 3/2+;
Decay: β - : 100.00 %;
t1/2: 3762s ≈ 1.04 h;

Actinium radioactive isotope number 29: 230Ac
Neutrons: 141;
Jn: 1+;
Decay: β - : 100.00 %;
t1/2: 122s ≈ 2.03 m;

Actinium radioactive isotope number 30: 231Ac
Neutrons: 142;
Jn: 1/2+;
Decay: β - : 100.00 %;
t1/2: 450s ≈ 7.50 m;

Actinium radioactive isotope number 31: 232Ac
Neutrons: 143;
Jn: 1+;
Decay: β - : 100.00 %;
t1/2: 119s ;

Actinium radioactive isotope number 32: 233Ac
Neutrons: 144;
Jn: 1/2+;
Decay: β - : 100.00 %;
t1/2: 145s ≈ 2.42 m;

Actinium radioactive isotope number 33: 234Ac
Neutrons: 145;
Jn: Unknown;
Decay: β - : 100.00 %;
t1/2: 44s ;

Actinium radioactive isotope number 34: 235Ac
Neutrons: 146;
Jn: Unknown;
Decay: β - ?;
t1/2: 40s ;

Actinium radioactive isotope number 35: 236Ac
Neutrons: 147;
Jn: Unknown;
Decay: β - ?;
t1/2: 120s ≈ 2.00 m;
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