It's Elemental - Isotopes of the Element Uranium

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Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information.

Isotopes of the Element Uranium with a Known Natural Abundance

Mass Number	Natural Abundance	Half-life

234	0.0054%	2.455×10⁺⁵ years

235	0.7204%	703.8×10⁺⁶ years

238	99.2742%	4.468×10⁺⁹ years

All Known Isotopes of the Element Uranium

Mass Number	Half-life	Decay Mode	Branching Percentage

218	1.5 milliseconds	Alpha Decay	100.00

219	42 microseconds	Alpha Decay	100.00

220	≈ 60 nanoseconds	Alpha Decay	No Data Available

		Electron Capture	No Data Available

221	≈ 0.7 microseconds	Alpha Decay	No Data Available

		Electron Capture	No Data Available

222	1.0 microseconds	Alpha Decay	100.00

223	18 microseconds	Alpha Decay	100.00

		Electron Capture	0.20

224	0.9 milliseconds	Alpha Decay	100.00

225	60 milliseconds	Alpha Decay	100.00

226	0.35 seconds	Alpha Decay	100.00

227	1.1 minutes	Alpha Decay	100.00

228	9.1 minutes	Alpha Decay	> 95.00

		Electron Capture	< 5.00

229	58 minutes	Electron Capture	~ 80.00

		Alpha Decay	~ 20.00

230	20.8 days	Alpha Decay	100.00

		Spontaneous Fission	< 1E-10

231	4.2 days	Electron Capture	100.00

		Alpha Decay	~ 4.0E-3

232	68.9 years	Alpha Decay	100.00

		Emission of a neon nucleus	9E-10

		Spontaneous Fission	< 1E-12

233	1.592×10⁺⁵ years	Alpha Decay	100.00

		Emission of a neon nucleus	7E-11

		Spontaneous Fission	< 6E-11

234	2.455×10⁺⁵ years	Alpha Decay	100.00

		Spontaneous Fission	1.6E-9

		Emission of a magnesium nucleus	1E-11

		Emission of a neon nucleus	9E-12

235	703.8×10⁺⁶ years	Alpha Decay	100.00

		Spontaneous Fission	7.0E-9

		Emission of a neon nucleus	8E-10

235_m	≈ 25 minutes	Isomeric Transition	100.00

236	2.342×10⁺⁷ years	Alpha Decay	100.00

		Spontaneous Fission	9.4E-8

		Emission of a magnesium-30 nucleus	No Data Available

237	6.75 days	Beta-minus Decay	100.00

238	4.468×10⁺⁹ years	Alpha Decay	100.00

		Spontaneous Fission	5.4E-5

239	23.45 minutes	Beta-minus Decay	100.00

240	14.1 hours	Beta-minus Decay	100.00

241	≈ 5 minutes	Beta-minus Decay	No Data Available

242	16.8 minutes	Beta-minus Decay	100.00