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Selenium Isotopes






Proton number: 34


Stable Isotopes


Selenium stable isotope number 1: 74Se
Neutrons: 40;
Abundance: 0.89%;
Jn: 0+;

Selenium stable isotope number 2: 76Se
Neutrons: 42;
Abundance: 9.37%;
Jn: 0+;

Selenium stable isotope number 3: 77Se
Neutrons: 43;
Abundance: 7.63%;
Jn: 1/2-;

Selenium stable isotope number 4: 78Se
Neutrons: 44;
Abundance: 23.77%;
Jn: 0+;

Selenium stable isotope number 5: 80Se
Neutrons: 46;
Abundance: 49.61%;
Jn: 0+;

Selenium stable isotope number 6: 82Se
Neutrons: 48;
Abundance: 8.73%;
Jn: 0+;

Natural Radioactive isotopes

There is no Selenium Natural Radioactive isotopes known

Artificial Radioactive isotopes


Selenium radioactive isotope number 1: 65Se
Neutrons: 31;
Jn: Unknown;
Decay: ε : 100.00 %;
t1/2: 0.05s ≈ 50.00 ms;

Selenium radioactive isotope number 2: 66Se
Neutrons: 32;
Jn: 0+;
Decay: ε : 100.00 %;
t1/2: 0.033s ≈ 33.00 ms;

Selenium radioactive isotope number 3: 67Se
Neutrons: 33;
Jn: Unknown;
Decay: ε : 100.00 %
β -p : 0.50 %;
t1/2: 0.136s ;

Selenium radioactive isotope number 4: 68Se
Neutrons: 34;
Jn: 0+;
Decay: ε : 100.00 %;
t1/2: 35.5s ;

Selenium radioactive isotope number 5: 69Se
Neutrons: 35;
Jn: 1/2-,3/2-;
Decay: ε : 100.00 %
ε p : 0.05 %;
t1/2: 27.4s ;

Selenium radioactive isotope number 6: 70Se
Neutrons: 36;
Jn: 0+;
Decay: ε : 100.00 %;
t1/2: 2466s ≈ 41.10 m;

Selenium radioactive isotope number 7: 71Se
Neutrons: 37;
Jn: 5/2-;
Decay: ε : 100.00 %;
t1/2: 284.4s ≈ 4.74 m;

Selenium radioactive isotope number 8: 72Se
Neutrons: 38;
Jn: 0+;
Decay: ε : 100.00 %;
t1/2: 725760s ≈ 8.40 d;

Selenium radioactive isotope number 9: 73Se
Neutrons: 39;
Jn: 9/2+;
Decay: ε : 100.00 %;
t1/2: 25740s ≈ 7.15 h;

Selenium radioactive isotope number 10: 73Se
Neutrons: 39;
Jn: 3/2-;
Decay: IT : 72.60 %
ε : 27.40 %;
t1/2: 2388s ≈ 39.80 m;

Selenium radioactive isotope number 11: 75Se
Neutrons: 41;
Jn: 5/2+;
Decay: ε : 100.00 %;
t1/2: 10349860s ≈ 119.79 d;

Selenium radioactive isotope number 12: 77Se
Neutrons: 43;
Jn: 7/2+;
Decay: IT : 100.00 %;
t1/2: 17.36s ;

Selenium radioactive isotope number 13: 79Se
Neutrons: 45;
Jn: 7/2+;
Decay: β - : 100.00 %;
t1/2: 9.30312E+12s ≈ 2.950000e+5 y;

Selenium radioactive isotope number 14: 79Se
Neutrons: 45;
Jn: 1/2-;
Decay: IT : 99.94 %
β - : 0.06 %;
t1/2: 235.2s ≈ 3.92 m;

Selenium radioactive isotope number 15: 81Se
Neutrons: 47;
Jn: 1/2-;
Decay: β - : 100.00 %;
t1/2: 1107s ≈ 18.45 m;

Selenium radioactive isotope number 16: 81Se
Neutrons: 47;
Jn: 7/2+;
Decay: IT : 99.95 %
β - : 0.05 %;
t1/2: 3436.8s ≈ 57.28 m;

Selenium radioactive isotope number 17: 82Se
Neutrons: 48;
Jn: 8+;
Decay: IT : 100.00 %;
t1/2: 6.6E-09s ≈ 6.60 ns;

Selenium radioactive isotope number 18: 83Se
Neutrons: 49;
Jn: 9/2+;
Decay: β - : 100.00 %;
t1/2: 1338s ≈ 22.30 m;

Selenium radioactive isotope number 19: 83Se
Neutrons: 49;
Jn: 1/2-;
Decay: β - : 100.00 %;
t1/2: 70.1s ;

Selenium radioactive isotope number 20: 84Se
Neutrons: 50;
Jn: 0+;
Decay: β - : 100.00 %;
t1/2: 186s ≈ 3.10 m;

Selenium radioactive isotope number 21: 85Se
Neutrons: 51;
Jn: 5/2+;
Decay: β - : 100.00 %;
t1/2: 31.7s ;

Selenium radioactive isotope number 22: 86Se
Neutrons: 52;
Jn: 0+;
Decay: β - : 100.00 %;
t1/2: 15.3s ;

Selenium radioactive isotope number 23: 87Se
Neutrons: 53;
Jn: 5/2+;
Decay: β - : 100.00 %
β -n : 0.20 %;
t1/2: 5.5s ;

Selenium radioactive isotope number 24: 88Se
Neutrons: 54;
Jn: 0+;
Decay: β - : 100.00 %
β -n : 0.67 %;
t1/2: 1.53s ;

Selenium radioactive isotope number 25: 89Se
Neutrons: 55;
Jn: 5/2+;
Decay: β - : 100.00 %
β -n : 7.80 %;
t1/2: 0.41s ;

Selenium radioactive isotope number 26: 90Se
Neutrons: 56;
Jn: 0+;
Decay: β -
β -n;
t1/2: 3E-07s ≈ 0.30 µs;

Selenium radioactive isotope number 27: 91Se
Neutrons: 57;
Jn: Unknown;
Decay: β - : 100.00 %
β -n : 21.00 %;
t1/2: 0.27s ;

Selenium radioactive isotope number 28: 92Se
Neutrons: 58;
Jn: 0+;
Decay: β - : 100.00 %;
t1/2: 3E-07s ≈ 0.30 µs;

Selenium radioactive isotope number 29: 93Se
Neutrons: 59;
Jn: 1/2+;
Decay: β -;
t1/2: 1.5E-07s ≈ 0.15 µs;

Selenium radioactive isotope number 30: 94Se
Neutrons: 60;
Jn: 0+;
Decay: β - : 100.00 %;
t1/2: 1.5E-07s ≈ 0.15 µs;
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