Isotopes of the Element Radium
[Click for Main Data]

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 Radium

Mass Number	Half-life	Decay Mode	Branching Percentage

202	0.7 milliseconds	Alpha Decay	No Data Available

203	1.1 milliseconds	Alpha Decay	No Data Available

203_m	33 milliseconds	Alpha Decay	No Data Available

204	59 milliseconds	Alpha Decay	No Data Available

205	0.21 seconds	Electron Capture	No Data Available

		Alpha Decay	No Data Available

205_m	0.17 seconds	Alpha Decay	No Data Available

206	0.24 seconds	Alpha Decay	100.00

207	1.3 seconds	Alpha Decay	~ 90.00

		Electron Capture	~ 10.00

207_m	55 milliseconds	Isomeric Transition	85.00

		Alpha Decay	15.00

		Electron Capture	~ 0.35

208	1.3 seconds	Alpha Decay	95.00

		Electron Capture	5.00

209	4.6 seconds	Alpha Decay	~ 90.00

		Electron Capture	~ 10.00

210	3.7 seconds	Alpha Decay	~ 96.00

		Electron Capture	~ 4.00

211	13 seconds	Alpha Decay	> 93.00

		Electron Capture	< 7.00

212	13.0 seconds	Alpha Decay	~ 90.00

		Electron Capture	~ 15.00

213	2.74 minutes	Alpha Decay	80.00

		Electron Capture	20.00

213_m	2.1 milliseconds	Isomeric Transition	~ 99.00

		Alpha Decay	~ 1.00

214	2.46 seconds	Alpha Decay	99.94

		Electron Capture	0.06

215	1.55 milliseconds	Alpha Decay	100.00

216	182 nanoseconds	Alpha Decay	100.00

		Electron Capture	< 1.0E-8

217	1.6 microseconds	Alpha Decay	100.00

218	25.6 microseconds	Alpha Decay	100.00

219	10 milliseconds	Alpha Decay	100.00

220	18 milliseconds	Alpha Decay	100.00

221	28 seconds	Alpha Decay	100.00

		Emission of a carbon-14 nucleus	1E-12

222	38.0 seconds	Alpha Decay	100.00

		Emission of a carbon-14 nucleus	3.0E-8

223	11.43 days	Alpha Decay	100.00

		Emission of a carbon-14 nucleus	8.9E-8

224	3.66 days	Alpha Decay	100.00

		Emission of a carbon-14 nucleus	4.0E-9

225	14.9 days	Beta-minus Decay	100.00

226	1600 years	Alpha Decay	100.00

		Emission of a carbon-14 nucleus	3.2E-9

227	42.2 minutes	Beta-minus Decay	100.00

228	5.75 years	Beta-minus Decay	100.00

229	4.0 minutes	Beta-minus Decay	100.00

230	93 minutes	Beta-minus Decay	100.00

231	103 seconds	Beta-minus Decay	100.00

232	250 seconds	Beta-minus Decay	100.00

233	30 seconds	Beta-minus Decay	100.00

234	30 seconds	Beta-minus Decay	100.00

This page is maintained by Steve Gagnon.

Citation and linking information

Isotopes of the Element Radium[Click for Main Data]

Isotopes of the Element Radium
[Click for Main Data]