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Americium Isotopes






Proton number: 95


Stable Isotopes

There is no Americium Stable isotopes known

Natural Radioactive isotopes

There is no Americium Natural Radioactive isotopes known

Artificial Radioactive isotopes


Americium radioactive isotope number 1: 231Am
Neutrons: 136;
Jn: Unknown;
Decay: α ?
ε ?;
t1/2: 10s ;

Americium radioactive isotope number 2: 232Am
Neutrons: 137;
Jn: Unknown;
Decay: ε ~ 97.00 %
α ~ 3.00 %
ε : 0.07 %;
t1/2: 79s ;

Americium radioactive isotope number 3: 233Am
Neutrons: 138;
Jn: Unknown;
Decay: α > 3.00 %
ε;
t1/2: 192s ≈ 3.20 m;

Americium radioactive isotope number 4: 234Am
Neutrons: 139;
Jn: Unknown;
Decay: ε > 99.96 %
α < 0.04 %;
t1/2: 139.2s ≈ 2.32 m;

Americium radioactive isotope number 5: 235Am
Neutrons: 140;
Jn: Unknown;
Decay: ε : 99.60 %
α : 0.40 %;
t1/2: 618s ≈ 10.30 m;

Americium radioactive isotope number 6: 236Am
Neutrons: 141;
Jn: 5-;
Decay: ε
α;
t1/2: 216s ≈ 3.60 m;

Americium radioactive isotope number 7: 236Am
Neutrons: 141;
Jn: 1-;
Decay: α
ε;
t1/2: 174s ≈ 2.90 m;

Americium radioactive isotope number 8: 237Am
Neutrons: 142;
Jn: 5/2-;
Decay: ε : 99.98 %
α : 0.03 %;
t1/2: 4380s ≈ 1.22 h;

Americium radioactive isotope number 9: 237Am
Neutrons: 142;
Jn: Unknown;
Decay: SF ≤ 100.00 %;
t1/2: 5E-09s ≈ 5.00 ns;

Americium radioactive isotope number 10: 238Am
Neutrons: 143;
Jn: 1+;
Decay: ε : 100.00 %
α : 1.0E-4 %;
t1/2: 5880s ≈ 1.63 h;

Americium radioactive isotope number 11: 238Am
Neutrons: 143;
Jn: Unknown;
Decay: SF ≤ 100.00 %
α;
t1/2: 3.5E-05s ≈ 35.00 µs;

Americium radioactive isotope number 12: 239Am
Neutrons: 144;
Jn: 5/2-;
Decay: ε : 99.99 %
α : 0.01 %;
t1/2: 42840s ≈ 11.90 h;

Americium radioactive isotope number 13: 240Am
Neutrons: 145;
Jn: 3-;
Decay: ε : 100.00 %
α : 1.9E-4 %;
t1/2: 182880s ≈ 2.12 d;

Americium radioactive isotope number 14: 241Am
Neutrons: 146;
Jn: 5/2-;
Decay: α : 100.00 %
SF : 4E-10 %;
t1/2: 13642470000s ≈ 432.60 y;

Americium radioactive isotope number 15: 241Am
Neutrons: 146;
Jn: Unknown;
Decay: SF : 100.00 %;
t1/2: 1.2E-06s ≈ 1.20 µs;

Americium radioactive isotope number 16: 242Am
Neutrons: 147;
Jn: 1-;
Decay: β - : 82.70 %
ε : 17.30 %;
t1/2: 57672s ≈ 16.02 h;

Americium radioactive isotope number 17: 242Am
Neutrons: 147;
Jn: 5-;
Decay: IT : 99.55 %
α : 0.45 %
SF < 4.7E-9 %;
t1/2: 4446576000s ≈ 141.00 y;

Americium radioactive isotope number 18: 242Am
Neutrons: 147;
Jn: 2+,3-;
Decay: SF ~ 100.00 %
α < 5.0E-3 %
IT;
t1/2: 0.014s ≈ 14.00 ms;

Americium radioactive isotope number 19: 243Am
Neutrons: 148;
Jn: 5/2-;
Decay: α : 100.00 %
SF : 3.7E-9 %;
t1/2: 232420300000s ≈ 7.369999e+3 y;

Americium radioactive isotope number 20: 243Am
Neutrons: 148;
Jn: Unknown;
Decay: SF ≤ 100.00 %;
t1/2: 5.5E-06s ≈ 5.50 µs;

Americium radioactive isotope number 21: 244Am
Neutrons: 149;
Jn: 6-;
Decay: β - : 100.00 %;
t1/2: 36360s ≈ 10.10 h;

Americium radioactive isotope number 22: 244Am
Neutrons: 149;
Jn: Unknown;
Decay: SF ≤ 100.00 %
SF ≤ 100.00 %;
t1/2: 6.5E-06s ≈ 6.50 µs;

Americium radioactive isotope number 23: 244Am
Neutrons: 149;
Jn: 1+;
Decay: β - : 99.96 % ε : 0.04 %;
t1/2: 1560s ≈ 26.00 m;

Americium radioactive isotope number 24: 245Am
Neutrons: 150;
Jn: 5/2+;
Decay: β - : 100.00 %;
t1/2: 7380s ≈ 2.05 h;

Americium radioactive isotope number 25: 246Am
Neutrons: 151;
Jn: 7-;
Decay: β - : 100.00 %;
t1/2: 2340s ≈ 39.00 m;

Americium radioactive isotope number 26: 246Am
Neutrons: 151;
Jn: 2-;
Decay: β - : 100.00 %
IT < 0.02 %;
t1/2: 1500s ≈ 25.00 m;

Americium radioactive isotope number 27: 247Am
Neutrons: 152;
Jn: 5/2;
Decay: β - : 100.00 %;
t1/2: 1380s ≈ 23.00 m;

Americium radioactive isotope number 28: 248Am
Neutrons: 153;
Jn: Unknown;
Decay: β - : 100.00 %;
t1/2: 600s ≈ 10.00 m;

Americium radioactive isotope number 29: 249Am
Neutrons: 154;
Jn: Unknown;
Decay: β - ?;
t1/2: 120s ≈ 2.00 m;
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