It's Elemental - Isotopes of the Element Francium

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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.

All Known Isotopes of the Element Francium

Mass Number	Half-life	Decay Mode	Branching Percentage

199	12 milliseconds	Alpha Decay	> 0.00

		Electron Capture	No Data Available

200	19 milliseconds	Alpha Decay	100.00

200_m	0.57 seconds	Alpha Decay	100.00

201	69 milliseconds	Alpha Decay	100.00

		Electron Capture	< 1.00

202	0.23 seconds	Alpha Decay	~ 97.00

		Electron Capture	~ 3.00

		Alpha Decay	~ 97.00

		Electron Capture	~ 3.00

203	0.55 seconds	Alpha Decay	~ 95.00

		Electron Capture	~ 5.00

204	1.7 seconds	Alpha Decay	~ 80.00

		Electron Capture	~ 20.00

204_m	2.6 seconds	Alpha Decay	<= 100.00

204_m2	≈ 1 seconds	Alpha Decay	<= 100.00

		Isomeric Transition	No Data Available

205	3.85 seconds	Alpha Decay	100.00

		Electron Capture	< 1.00

206	≈ 16 seconds	Alpha Decay	~ 84.00

		Electron Capture	~ 16.00

206_m	15.9 seconds	Alpha Decay	84.00

		Electron Capture	16.00

206_m2	0.7 seconds	Alpha Decay	~ 12.00

		Isomeric Transition	No Data Available

207	14.8 seconds	Alpha Decay	95.00

		Electron Capture	5.00

208	59.1 seconds	Alpha Decay	90.00

		Electron Capture	10.00

209	50.0 seconds	Alpha Decay	89.00

		Electron Capture	11.00

210	3.18 minutes	Alpha Decay	60.00

		Electron Capture	40.00

211	3.10 minutes	Alpha Decay	> 80.00

		Electron Capture	< 20.00

212	20.0 minutes	Electron Capture	57.00

		Alpha Decay	43.00

213	34.6 seconds	Alpha Decay	99.45

		Electron Capture	0.55

214	5.0 milliseconds	Alpha Decay	100.00

214_m	3.35 milliseconds	Alpha Decay	100.00

215	86 nanoseconds	Alpha Decay	100.00

216	0.70 microseconds	Alpha Decay	100.00

		Electron Capture	< 2.0E-7

217	22 microseconds	Alpha Decay	100.00

218	1.0 milliseconds	Alpha Decay	100.00

218_m	22.0 milliseconds	Alpha Decay	<= 100.00

		Isomeric Transition	No Data Available

219	20 milliseconds	Alpha Decay	100.00

220	27.4 seconds	Alpha Decay	99.65

		Beta-minus Decay	0.35

221	4.9 minutes	Alpha Decay	100.00

		Beta-minus Decay	< 0.10

		Emission of a carbon-14 nucleus	9E-13

222	14.2 minutes	Beta-minus Decay	100.00

223	22.00 minutes	Beta-minus Decay	99.99

		Alpha Decay	6.0E-3

224	3.33 minutes	Beta-minus Decay	100.00

225	4.0 minutes	Beta-minus Decay	100.00

226	49 seconds	Beta-minus Decay	100.00

227	2.47 minutes	Beta-minus Decay	100.00

228	38 seconds	Beta-minus Decay	<= 100.00

229	50.2 seconds	Beta-minus Decay	100.00

230	19.1 seconds	Beta-minus Decay	100.00

231	17.6 seconds	Beta-minus Decay	100.00

232	5 seconds	Beta-minus Decay	100.00