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Promethium Isotopes






Proton number: 61


Stable Isotopes

There is no Promethium Stable isotopes known

Natural Radioactive isotopes

There is no Promethium Natural Radioactive isotopes known

Artificial Radioactive isotopes


Promethium radioactive isotope number 1: 126Pm
Neutrons: 65;
Jn: Unknown;
Decay: ε ?;
t1/2: 0.5s ;

Promethium radioactive isotope number 2: 127Pm
Neutrons: 66;
Jn: Unknown;
Decay: p ?
ε ?;
t1/2: 1s ;

Promethium radioactive isotope number 3: 128Pm
Neutrons: 67;
Jn: Unknown;
Decay: ε : 100.00 %
ε p
α;
t1/2: 1s ;

Promethium radioactive isotope number 4: 129Pm
Neutrons: 68;
Jn: 5/2-;
Decay: ε;
t1/2: 2.4s ;

Promethium radioactive isotope number 5: 130Pm
Neutrons: 69;
Jn: 4,5,6;
Decay: ε : 100.00 %
ε p;
t1/2: 2.6s ;

Promethium radioactive isotope number 6: 131Pm
Neutrons: 70;
Jn: 11/2-;
Decay: ε : 100.00 %;
t1/2: 6.3s ;

Promethium radioactive isotope number 7: 132Pm
Neutrons: 71;
Jn: 3+;
Decay: ε : 100.00 %
ε p ~ 5.0E-5 %;
t1/2: 6.2s ;

Promethium radioactive isotope number 8: 133Pm
Neutrons: 72;
Jn: 11/2-;
Decay: ε : 100.00 %;
t1/2: 15s ;

Promethium radioactive isotope number 9: 134Pm
Neutrons: 73;
Jn: 2+;
Decay: ε : 100.00 %;
t1/2: 5s ;

Promethium radioactive isotope number 10: 134Pm
Neutrons: 73;
Jn: 5+;
Decay: ε : 100.00 %;
t1/2: 22s ;

Promethium radioactive isotope number 11: 135Pm
Neutrons: 74;
Jn: 11/2-;
Decay: ε : 100.00 %;
t1/2: 45s ;

Promethium radioactive isotope number 12: 135Pm
Neutrons: 74;
Jn: 3/2+,5/2+;
Decay: ε : 100.00 %;
t1/2: 49s ;

Promethium radioactive isotope number 13: 136Pm
Neutrons: 75;
Jn: 5-;
Decay: ε : 100.00 %;
t1/2: 107s ;

Promethium radioactive isotope number 14: 136Pm
Neutrons: 75;
Jn: 2+;
Decay: ε : 100.00 %;
t1/2: 47s ;

Promethium radioactive isotope number 15: 137Pm
Neutrons: 76;
Jn: 11/2-;
Decay: ε : 100.00 %;
t1/2: 144s ≈ 2.40 m;

Promethium radioactive isotope number 16: 138Pm
Neutrons: 77;
Jn: Unknown;
Decay: ε : 100.00 %;
t1/2: 10s ;

Promethium radioactive isotope number 17: 138Pm
Neutrons: 77;
Jn: Unknown;
Decay: ε ;
t1/2: 194.4s ≈ 3.24 m;

Promethium radioactive isotope number 18: 139Pm
Neutrons: 78;
Jn: 5/2+;
Decay: ε : 100.00 %;
t1/2: 249s ≈ 4.15 m;

Promethium radioactive isotope number 19: 139Pm
Neutrons: 78;
Jn: 11/2-;
Decay: IT : 99.94 %
ε : 0.06 %;
t1/2: 0.18s ;

Promethium radioactive isotope number 20: 140Pm
Neutrons: 79;
Jn: 1+;
Decay: ε : 100.00 %;
t1/2: 9.2s ;

Promethium radioactive isotope number 21: 140Pm
Neutrons: 79;
Jn: 8-;
Decay: ε : 100.00 %;
t1/2: 357s ≈ 5.95 m;

Promethium radioactive isotope number 22: 141Pm
Neutrons: 80;
Jn: 5/2+;
Decay: ε : 100.00 %;
t1/2: 1254s ≈ 20.90 m;

Promethium radioactive isotope number 23: 142Pm
Neutrons: 81;
Jn: 1+;
Decay: ε : 100.00 %;
t1/2: 40.5s ;

Promethium radioactive isotope number 24: 143Pm
Neutrons: 82;
Jn: 5/2+;
Decay: ε : 100.00 %;
t1/2: 22896000s ≈ 265.00 d;

Promethium radioactive isotope number 25: 144Pm
Neutrons: 83;
Jn: 5-;
Decay: ε : 100.00 %;
t1/2: 31363200s ≈ 363.00 d;

Promethium radioactive isotope number 26: 145Pm
Neutrons: 84;
Jn: 5/2+;
Decay: ε : 100.00 %
α : 3E-07 %;
t1/2: 558187200s ≈ 17.70 y;

Promethium radioactive isotope number 27: 146Pm
Neutrons: 85;
Jn: 3-;
Decay: ε : 66.00 %
β - : 34.00 %;
t1/2: 174394100s ≈ 5.53 y;

Promethium radioactive isotope number 28: 147Pm
Neutrons: 86;
Jn: 7/2+;
Decay: β - : 100.00 %;
t1/2: 82731540s ≈ 2.62 y;

Promethium radioactive isotope number 29: 148Pm
Neutrons: 87;
Jn: 1-;
Decay: β - : 100.00 %;
t1/2: 463795.2s ≈ 5.37 d;

Promethium radioactive isotope number 30: 148Pm
Neutrons: 87;
Jn: 5-,6-;
Decay: β - : 95.80 %
IT : 4.20 %;
t1/2: 3567456s ≈ 41.29 d;

Promethium radioactive isotope number 31: 149Pm
Neutrons: 88;
Jn: 7/2+;
Decay: β - : 100.00 %;
t1/2: 191088s ≈ 2.21 d;

Promethium radioactive isotope number 32: 150Pm
Neutrons: 89;
Jn: 1-;
Decay: β - : 100.00 %;
t1/2: 9648s ≈ 2.68 h;

Promethium radioactive isotope number 33: 151Pm
Neutrons: 90;
Jn: 5/2+;
Decay: β - : 100.00 %;
t1/2: 102240s ≈ 28.40 h;

Promethium radioactive isotope number 34: 152Pm
Neutrons: 91;
Jn: 1+;
Decay: β - : 100.00 %;
t1/2: 247.2s ≈ 4.12 m;

Promethium radioactive isotope number 35: 152Pm
Neutrons: 91;
Jn: 4-;
Decay: β - : 100.00 %;
t1/2: 451.2s ≈ 7.52 m;

Promethium radioactive isotope number 36: 152Pm
Neutrons: 91;
Jn: 8;
Decay: β - ≤ 100.00 % IT ≥ 0.00 %;
t1/2: 828s ≈ 13.80 m;

Promethium radioactive isotope number 37: 153Pm
Neutrons: 92;
Jn: 5/2-;
Decay: β - : 100.00 %;
t1/2: 315s ≈ 5.25 m;

Promethium radioactive isotope number 38: 154Pm
Neutrons: 93;
Jn: 3,4;
Decay: β - : 100.00 %;
t1/2: 160.8s ≈ 2.68 m;

Promethium radioactive isotope number 39: 154Pm
Neutrons: 93;
Jn: 0,1;
Decay: β - : 100.00 %;
t1/2: 103.8s ;

Promethium radioactive isotope number 40: 155Pm
Neutrons: 94;
Jn: 5/2-;
Decay: β - : 100.00 %;
t1/2: 41.5s ;

Promethium radioactive isotope number 41: 156Pm
Neutrons: 95;
Jn: 4-;
Decay: β - : 100.00 %;
t1/2: 26.7s ;

Promethium radioactive isotope number 42: 157Pm
Neutrons: 96;
Jn: 5/2-;
Decay: β - : 100.00 %;
t1/2: 10.56s ;

Promethium radioactive isotope number 43: 158Pm
Neutrons: 97;
Jn: Unknown;
Decay: β - : 100.00 %;
t1/2: 4.8s ;

Promethium radioactive isotope number 44: 159Pm
Neutrons: 98;
Jn: Unknown;
Decay: β - : 100.00 %;
t1/2: 1.47s ;

Promethium radioactive isotope number 45: 160Pm
Neutrons: 99;
Jn: Unknown;
Decay: β - ?;
t1/2: 2s ;

Promethium radioactive isotope number 46: 161Pm
Neutrons: 100;
Jn: Unknown;
Decay: β - ?;
t1/2: 0.7s ;

Promethium radioactive isotope number 47: 162Pm
Neutrons: 101;
Jn: Unknown;
Decay: β - ?;
t1/2: 0.5s ;

Promethium radioactive isotope number 48: 163Pm
Neutrons: 102;
Jn: Unknown;
Decay: β - ?;
t1/2: 0.2s ;
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