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Pu
Plutonium
20 known isotopes (0 stable,
20 radioactive)
228Pu
Mass
228.038763 u
Abundance —
Half-life 1.1 seconds
Spin/Parity 0+
Decay Mode(s) α (100%)
229Pu
Mass
229.040145 u
Abundance —
Half-life 90 seconds
Spin/Parity (3/2+)
Decay Mode(s) α (100%)
230Pu
Mass
230.039648 u
Abundance —
Half-life 102 seconds
Spin/Parity —
Decay Mode(s) α (100%)
231Pu
Mass
231.041126 u
Abundance —
Half-life 8.6 m
Spin/Parity (3/2+)
Decay Mode(s) EC/β⁺ (90%), α (10%)
232Pu
Mass
232.041182 u
Abundance —
Half-life 33.8 m
Spin/Parity 0+
Decay Mode(s) Electron capture (90%), α (10%)
233Pu
Mass
233.042997 u
Abundance —
Half-life 20.9 m
Spin/Parity —
Decay Mode(s) EC/β⁺ (99.88%), α (0.12%)
234Pu
Mass
234.043317 u
Abundance —
Half-life 8.8 h
Spin/Parity 0+
Decay Mode(s) Electron capture (94%), α (6%)
235Pu
Mass
235.045285 u
Abundance —
Half-life 25.3 m
Spin/Parity (5/2+)
Decay Mode(s) EC/β⁺ (99.9972%), α (0.0028%)
236Pu
Mass
236.046057 u
Abundance —
Half-life 2.858 years
Spin/Parity 0+
Decay Mode(s) α (100%), Spontaneous fission (1.9e-7%)
237Pu
Mass
237.048408 u
Abundance —
Half-life 45.64 d
Spin/Parity 7/2-
Decay Mode(s) Electron capture (99.9958%), α (0.0042%)
238Pu
Mass
238.049558 u
Abundance —
Half-life 87.7 years
Spin/Parity 0+
Decay Mode(s) α (100%), Spontaneous fission (1.9e-7%)
239Pu
Mass
239.052162 u
Abundance —
Half-life 24110 years
Spin/Parity 1/2+
Decay Mode(s) α (100%), Spontaneous fission (3.1e-10%)
240Pu
Mass
240.053812 u
Abundance —
Half-life 6561 years
Spin/Parity 0+
Decay Mode(s) α (100%), Spontaneous fission (0.0000057%), {+34}Si (1.3e-11%)
241Pu
Mass
241.056850 u
Abundance —
Half-life 14.329 years
Spin/Parity 5/2+
Decay Mode(s) β⁻ (99.998%), α (0.00247%), Spontaneous fission (2.4e-14%)
242Pu
Mass
242.058741 u
Abundance —
Half-life 3.73E+5 years
Spin/Parity 0+
Decay Mode(s) α (100%), Spontaneous fission (0.000553%)
243Pu
Mass
243.062002 u
Abundance —
Half-life 4.956 h
Spin/Parity 7/2+
Decay Mode(s) β⁻ (100%)
244Pu
Mass
244.064204 u
Abundance —
Half-life 8.13E+7 years
Spin/Parity 0+
Decay Mode(s) α (99.877%), Spontaneous fission (0.123%)
245Pu
Mass
245.067825 u
Abundance —
Half-life 10.5 h
Spin/Parity (9/2-)
Decay Mode(s) β⁻ (100%)
246Pu
Mass
246.070204 u
Abundance —
Half-life 10.84 d
Spin/Parity 0+
Decay Mode(s) β⁻ (100%)
247Pu
Mass
247.074300 u
Abundance —
Half-life 2.27 d
Spin/Parity (1/2+)
Decay Mode(s) β⁻ (100%)
Decay mode abbreviations:
β⁻ = Beta minus decay, β⁺ = Beta plus decay, EC = Electron capture, α = Alpha decay
n = Neutron emission, p = Proton emission, SF = Spontaneous fission, IT = Isomeric transition
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