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Caesium Isotopes






Proton number: 55


Stable Isotopes


Caesium stable isotope number 1: 133Cs
Neutrons: 78;
Abundance: 100%;
Jn: 7/2+;

Natural Radioactive isotopes

There is no Caesium Natural Radioactive isotopes known

Artificial Radioactive isotopes


Caesium radioactive isotope number 1: 112Cs
Neutrons: 57;
Jn: 0+,3+;
Decay: p : 100.00 %;
t1/2: 0.0005s ≈ 0.50 ms;

Caesium radioactive isotope number 2: 113Cs
Neutrons: 58;
Jn: 3/2+;
Decay: p : 100.00 %
α;
t1/2: 1.67E-05s ≈ 16.70 µs;

Caesium radioactive isotope number 3: 114Cs
Neutrons: 59;
Jn: 1+;
Decay: ε ~ 100.00 %
ε p : 8.70 %
ε α : 0.19 %
α : 0.02 %;
t1/2: 0.57s ;

Caesium radioactive isotope number 4: 115Cs
Neutrons: 60;
Jn: Unknown;
Decay: ε : 100.00 %
ε p ~ 0.07 %;
t1/2: 1.4s ;

Caesium radioactive isotope number 5: 116Cs
Neutrons: 61;
Jn: 1+;
Decay: ε : 100.00 %
ε p > 0.00 %
ε α > 0.00 %;
t1/2: 0.7s ;

Caesium radioactive isotope number 6: 116Cs
Neutrons: 61;
Jn: 4+,5,6;
Decay: ε : 100.00 %
ε α > 0.00 %
ε p > 0.00 %;
t1/2: 3.85s ;

Caesium radioactive isotope number 7: 117Cs
Neutrons: 62;
Jn: 9/2+;
Decay: ε : 100.00 %;
t1/2: 8.4s ;

Caesium radioactive isotope number 8: 117Cs
Neutrons: 62;
Jn: 3/2+;
Decay: ε : 100.00 %;
t1/2: 6.5s ;

Caesium radioactive isotope number 9: 118Cs
Neutrons: 63;
Jn: 2;
Decay: ε : 100.00 %
ε p < 0.04 %
ε α < 2.4E-3 %;
t1/2: 14s ;

Caesium radioactive isotope number 10: 118Cs
Neutrons: 63;
Jn: 6,7,8;
Decay: ε : 100.00 %
ε p < 0.04 %
ε α < 2.4E-3 %;
t1/2: 17s ;

Caesium radioactive isotope number 11: 119Cs
Neutrons: 64;
Jn: 9/2+;
Decay: ε : 100.00 %;
t1/2: 43s ;

Caesium radioactive isotope number 12: 119Cs
Neutrons: 64;
Jn: 3/2+;
Decay: ε : 100.00 %;
t1/2: 30.4s ;

Caesium radioactive isotope number 13: 120Cs
Neutrons: 65;
Jn: 2+;
Decay: ε : 100.00 %
ε α : 2.0E-5 %
ε p : 7.0E-6 %;
t1/2: 61.3s ;

Caesium radioactive isotope number 14: 120Cs
Neutrons: 65;
Jn: 7-;
Decay: ε : 100.00 %;
t1/2: 57s ;

Caesium radioactive isotope number 15: 121Cs
Neutrons: 66;
Jn: 3/2+;
Decay: ε : 100.00 %;
t1/2: 155s ≈ 2.58 m;

Caesium radioactive isotope number 16: 121Cs
Neutrons: 66;
Jn: 9/2+;
Decay: ε : 83.00 %
IT : 17.00 %;
t1/2: 122s ≈ 2.03 m;

Caesium radioactive isotope number 17: 122Cs
Neutrons: 67;
Jn: 1+;
Decay: ε : 100.00 %;
t1/2: 21s ;

Caesium radioactive isotope number 18: 122Cs
Neutrons: 67;
Jn: 8-;
Decay: ε : 100.00 %;
t1/2: 222s ≈ 3.70 m;

Caesium radioactive isotope number 19: 122Cs
Neutrons: 67;
Jn: 5-;
Decay: IT : 100.00 %;
t1/2: 0.36s ;

Caesium radioactive isotope number 20: 123Cs
Neutrons: 68;
Jn: 1/2+;
Decay: ε : 100.00 %;
t1/2: 352.8s ≈ 5.88 m;

Caesium radioactive isotope number 21: 123Cs
Neutrons: 68;
Jn: 11/2-;
Decay: IT : 100.00 %;
t1/2: 1.64s ;

Caesium radioactive isotope number 22: 124Cs
Neutrons: 69;
Jn: 1+;
Decay: ε : 100.00 %;
t1/2: 30.8s ;

Caesium radioactive isotope number 23: 124Cs
Neutrons: 69;
Jn: 7+;
Decay: IT : 100.00 %;
t1/2: 6.3s ;

Caesium radioactive isotope number 24: 125Cs
Neutrons: 70;
Jn: 1/2+;
Decay: ε : 100.00 %;
t1/2: 2802s ≈ 46.70 m;

Caesium radioactive isotope number 25: 125Cs
Neutrons: 70;
Jn: 11/2-;
Decay: IT : 100.00 %;
t1/2: 0.0009s ≈ 0.90 ms;

Caesium radioactive isotope number 26: 126Cs
Neutrons: 71;
Jn: 1+;
Decay: ε : 100.00 %;
t1/2: 98.4s ;

Caesium radioactive isotope number 27: 127Cs
Neutrons: 72;
Jn: 1/2+;
Decay: ε : 100.00 %;
t1/2: 22500s ≈ 6.25 h;

Caesium radioactive isotope number 28: 127Cs
Neutrons: 72;
Jn: 11/2-;
Decay: IT : 100.00 %;
t1/2: 5.5E-05s ≈ 55.00 µs;

Caesium radioactive isotope number 29: 128Cs
Neutrons: 73;
Jn: 1+;
Decay: ε : 100.00 %;
t1/2: 219.6s ≈ 3.66 m;

Caesium radioactive isotope number 30: 129Cs
Neutrons: 74;
Jn: 1/2+;
Decay: ε : 100.00 %;
t1/2: 115416s ≈ 32.06 h;

Caesium radioactive isotope number 31: 130Cs
Neutrons: 75;
Jn: 1+;
Decay: ε : 98.40 %
β - : 1.60 %;
t1/2: 1752.6s ≈ 29.21 m;

Caesium radioactive isotope number 32: 130Cs
Neutrons: 75;
Jn: 5-;
Decay: IT : 99.84 %
ε : 0.16 %;
t1/2: 207.6s ≈ 3.46 m;

Caesium radioactive isotope number 33: 131Cs
Neutrons: 76;
Jn: 5/2+;
Decay: ε : 100.00 %;
t1/2: 837129.6s ≈ 9.69 d;

Caesium radioactive isotope number 34: 132Cs
Neutrons: 77;
Jn: 2+;
Decay: ε : 98.13 %
β - : 1.87 %;
t1/2: 559872s ≈ 6.48 d;

Caesium radioactive isotope number 35: 134Cs
Neutrons: 79;
Jn: 4+;
Decay: β - : 100.00 %
ε : 3.0E-4 %;
t1/2: 65128150s ≈ 2.07 y;

Caesium radioactive isotope number 36: 134Cs
Neutrons: 79;
Jn: 8-;
Decay: IT : 100.00 %;
t1/2: 10483.2s ≈ 2.91 h;

Caesium radioactive isotope number 37: 135Cs
Neutrons: 80;
Jn: 7/2+;
Decay: β - : 100.00 %;
t1/2: 7.25328E+13s ≈ 2.300000e+6 y;

Caesium radioactive isotope number 38: 135Cs
Neutrons: 80;
Jn: 19/2-;
Decay: IT : 100.00 %;
t1/2: 3180s ≈ 53.00 m;

Caesium radioactive isotope number 39: 136Cs
Neutrons: 81;
Jn: 5+;
Decay: β - : 100.00 %;
t1/2: 1126656s ≈ 13.04 d;

Caesium radioactive isotope number 40: 136Cs
Neutrons: 81;
Jn: 8-;
Decay: IT > 0.00 %
β -;
t1/2: 19s ;

Caesium radioactive isotope number 41: 137Cs
Neutrons: 82;
Jn: 7/2+;
Decay: β - : 100.00 %;
t1/2: 947026100s ≈ 30.03 y;

Caesium radioactive isotope number 42: 138Cs
Neutrons: 83;
Jn: 3-;
Decay: β - : 100.00 %;
t1/2: 2004.6s ≈ 33.41 m;

Caesium radioactive isotope number 43: 138Cs
Neutrons: 83;
Jn: 6-;
Decay: IT : 81.00 %
β - : 19.00 %;
t1/2: 174.6s ≈ 2.91 m;

Caesium radioactive isotope number 44: 139Cs
Neutrons: 84;
Jn: 7/2+;
Decay: β - : 100.00 %;
t1/2: 556.2s ≈ 9.27 m;

Caesium radioactive isotope number 45: 140Cs
Neutrons: 85;
Jn: 1-;
Decay: β - : 100.00 %;
t1/2: 63.7s ;

Caesium radioactive isotope number 46: 141Cs
Neutrons: 86;
Jn: 7/2+;
Decay: β - : 100.00 %
β -n : 0.04 %;
t1/2: 24.84s ;

Caesium radioactive isotope number 47: 142Cs
Neutrons: 87;
Jn: 0-;
Decay: β - : 100.00 %
β -n : 0.09 %;
t1/2: 1.684s ;

Caesium radioactive isotope number 48: 143Cs
Neutrons: 88;
Jn: 3/2+;
Decay: β - : 100.00 %
β -n : 1.64 %;
t1/2: 1.791s ;

Caesium radioactive isotope number 49: 144Cs
Neutrons: 89;
Jn: 1;
Decay: β - : 100.00 %
β -n : 3.20 %;
t1/2: 0.994s ;

Caesium radioactive isotope number 50: 144Cs
Neutrons: 89;
Jn: GE4;
Decay: β - ;
t1/2: 1s ;

Caesium radioactive isotope number 51: 145Cs
Neutrons: 90;
Jn: 3/2+;
Decay: β - : 100.00 %
β -n : 14.30 %;
t1/2: 0.594s ;

Caesium radioactive isotope number 52: 146Cs
Neutrons: 91;
Jn: 1-;
Decay: β - : 100.00 %
β -n : 14.20 %;
t1/2: 0.321s ;

Caesium radioactive isotope number 53: 147Cs
Neutrons: 92;
Jn: 3/2+;
Decay: β - : 100.00 %
β -n : 43.00 %;
t1/2: 0.235s ;

Caesium radioactive isotope number 54: 148Cs
Neutrons: 93;
Jn: Unknown;
Decay: β - : 100.00 %
β -n : 25.10 %;
t1/2: 0.146s ;

Caesium radioactive isotope number 55: 149Cs
Neutrons: 94;
Jn: Unknown;
Decay: β -n
β -;
t1/2: 0.05s ≈ 50.00 ms;

Caesium radioactive isotope number 56: 150Cs
Neutrons: 95;
Jn: Unknown;
Decay: β -
β -n;
t1/2: 0.05s ≈ 50.00 ms;

Caesium radioactive isotope number 57: 151Cs
Neutrons: 96;
Jn: Unknown;
Decay: β -n
β -;
t1/2: 0.05s ≈ 50.00 ms;
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