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Neptunium Isotopes






Proton number: 93


Stable Isotopes

There is no Neptunium Stable isotopes known

Natural Radioactive isotopes

There is no Neptunium Natural Radioactive isotopes known

Artificial Radioactive isotopes


Neptunium radioactive isotope number 1: 225Np
Neutrons: 132;
Jn: 9/2-;
Decay: α : 100.00 %;
t1/2: 2E-06s ≈ 2.00 µs;

Neptunium radioactive isotope number 2: 226Np
Neutrons: 133;
Jn: Unknown;
Decay: α : 100.00 %;
t1/2: 0.035s ≈ 35.00 ms;

Neptunium radioactive isotope number 3: 227Np
Neutrons: 134;
Jn: Unknown;
Decay: α : 100.00 %;
t1/2: 0.51s ;

Neptunium radioactive isotope number 4: 228Np
Neutrons: 135;
Jn: Unknown;
Decay: ε : 60.00 %
α : 40.00 %;
t1/2: 61.4s ;

Neptunium radioactive isotope number 5: 229Np
Neutrons: 136;
Jn: Unknown;
Decay: α : 68.00 %
ε : 32.00 %;
t1/2: 240s ≈ 4.00 m;

Neptunium radioactive isotope number 6: 230Np
Neutrons: 137;
Jn: Unknown;
Decay: ε ≤ 97.00 %
α ≥ 3.00 %;
t1/2: 276s ≈ 4.60 m;

Neptunium radioactive isotope number 7: 231Np
Neutrons: 138;
Jn: 5/2;
Decay: ε : 98.00 %
α : 2.00 %;
t1/2: 2928s ≈ 48.80 m;

Neptunium radioactive isotope number 8: 232Np
Neutrons: 139;
Jn: 4+;
Decay: ε : 100.00 %
α : 2.0E-4 %;
t1/2: 882s ≈ 14.70 m;

Neptunium radioactive isotope number 9: 233Np
Neutrons: 140;
Jn: 5/2+;
Decay: ε : 100.00 %
α ≤ 1.0E-3 %;
t1/2: 2172s ≈ 36.20 m;

Neptunium radioactive isotope number 10: 234Np
Neutrons: 141;
Jn: 0+;
Decay: ε : 100.00 %;
t1/2: 380160s ≈ 4.40 d;

Neptunium radioactive isotope number 11: 235Np
Neutrons: 142;
Jn: 5/2+;
Decay: ε : 100.00 %
α : 2.6E-3 %;
t1/2: 34223040s ≈ 1.09 y;

Neptunium radioactive isotope number 12: 236Np
Neutrons: 143;
Jn: 6-;
Decay: ε : 86.30 %
β - : 13.50 %
α : 0.16 %;
t1/2: 4.825008E+12s ≈ 1.530000e+5 y;

Neptunium radioactive isotope number 13: 236Np
Neutrons: 143;
Jn: 1;
Decay: β - : 50.00 %
ε : 50.00 %;
t1/2: 81000s ≈ 22.50 h;

Neptunium radioactive isotope number 14: 237Np
Neutrons: 144;
Jn: 5/2+;
Decay: α : 100.00 %
SF ≤ 2E-10 %;
t1/2: 6.761318E+13s ≈ 2.144000e+6 y;

Neptunium radioactive isotope number 15: 238Np
Neutrons: 145;
Jn: 2+;
Decay: β - : 100.00 %;
t1/2: 182908.8s ≈ 2.12 d;

Neptunium radioactive isotope number 16: 239Np
Neutrons: 146;
Jn: 5/2+;
Decay: β - : 100.00 %;
t1/2: 203558.4s ≈ 2.36 d;

Neptunium radioactive isotope number 17: 240Np
Neutrons: 147;
Jn: 5+;
Decay: β - : 100.00 %;
t1/2: 3714s ≈ 1.03 h;

Neptunium radioactive isotope number 18: 240Np
Neutrons: 147;
Jn: 1+;
Decay: β - : 99.88 %
IT : 0.12 %;
t1/2: 433.2s ≈ 7.22 m;

Neptunium radioactive isotope number 19: 241Np
Neutrons: 148;
Jn: 5/2+;
Decay: β - : 100.00 %;
t1/2: 834s ≈ 13.90 m;

Neptunium radioactive isotope number 20: 242Np
Neutrons: 149;
Jn: 1+;
Decay: β - : 100.00 %;
t1/2: 132s ≈ 2.20 m;

Neptunium radioactive isotope number 21: 242Np
Neutrons: 149;
Jn: 6+;
Decay: β - : 100.00 %;
t1/2: 330s ≈ 5.50 m;

Neptunium radioactive isotope number 22: 243Np
Neutrons: 150;
Jn: 5/2-;
Decay: β - : 100.00 %;
t1/2: 111s ;

Neptunium radioactive isotope number 23: 244Np
Neutrons: 151;
Jn: 7-;
Decay: β - : 100.00 %;
t1/2: 137.4s ≈ 2.29 m;
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