It's Elemental - Isotopes of the Element Curium

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

All Known Isotopes of the Element Curium

Mass Number	Half-life	Decay Mode	Branching Percentage

232	1 minutes	Spontaneous Fission	< 30.3

233	≈ 1 minutes	Electron Capture	No Data Available

		Alpha Decay	No Data Available

234	≈ 2 minutes	Electron Capture	No Data Available

		Alpha Decay	No Data Available

235	≈ 5 minutes	Electron Capture	No Data Available

		Alpha Decay	No Data Available

236	≈ 10 minutes	Electron Capture	No Data Available

		Alpha Decay	No Data Available

237	≈ 20 minutes	Electron Capture	No Data Available

		Alpha Decay	No Data Available

238	2.4 hours	Electron Capture	>= 90.00

		Alpha Decay	<= 10.00

239	≈ 2.9 hours	Electron Capture	100.00

		Alpha Decay	< 0.10

240	27 days	Alpha Decay	> 99.50

		Electron Capture	< 0.50

		Spontaneous Fission	3.9E-6

241	32.8 days	Electron Capture	99.00

		Alpha Decay	1.00

242	162.8 days	Alpha Decay	100.00

		Spontaneous Fission	6.2E-6

		Emission of a silicon-34 nucleus	1.E-14

242_m	40 picoseconds	Spontaneous Fission	<= 100.00

242_m2	180 nanoseconds	Spontaneous Fission	No Data Available

		Isomeric Transition	No Data Available

243	29.1 years	Alpha Decay	99.71

		Electron Capture	0.29

		Spontaneous Fission	5.3E-9

244	18.10 years	Alpha Decay	100.00

		Spontaneous Fission	1.4E-4

245	8500 years	Alpha Decay	100.00

		Spontaneous Fission	6.1E-7

246	4760 years	Alpha Decay	99.97

		Spontaneous Fission	0.03

247	1.56×10⁺⁷ years	Alpha Decay	100.00

248	3.48×10⁺⁵ years	Alpha Decay	91.61

		Spontaneous Fission	8.39

249	64.15 minutes	Beta-minus Decay	100.00

250	≈ 8.3×10⁺³ years	Spontaneous Fission	~ 74.00

		Alpha Decay	~ 18.00

		Beta-minus Decay	~ 8.00

251	16.8 minutes	Beta-minus Decay	100.00

252	< 2 days	Beta-minus Decay	No Data Available