It's Elemental - Isotopes of the Element Bismuth

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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 Bismuth with a Known Natural Abundance

Mass Number	Natural Abundance	Half-life

209	100%	1.9×10⁺¹⁹ years

All Known Isotopes of the Element Bismuth

Mass Number	Half-life	Decay Mode	Branching Percentage

185	50 microseconds	Proton Emission	85.00

		Alpha Decay	15.00

186	15.0 milliseconds	Alpha Decay	100.00

186_m	9.8 milliseconds	Alpha Decay	~ 100.00

187	32 milliseconds	Alpha Decay	>= 50.00

187_m	0.29 milliseconds	Alpha Decay	>= 50.00

188	44 milliseconds	Electron Capture	< 100.00

		Alpha Decay	> 0.00

188_m	0.21 seconds	Electron Capture	< 100.00

		Alpha Decay	> 0.00

189	728 milliseconds	Alpha Decay	> 50.00

		Electron Capture	< 50.00

189_m	4.8 milliseconds	Alpha Decay	> 50.00

		Electron Capture	< 50.00

190	6.2 seconds	Alpha Decay	70.00

		Electron Capture	30.00

190_m	6.3 seconds	Alpha Decay	~ 90.00

		Electron Capture	~ 10.00

191	12.3 seconds	Alpha Decay	60.00

		Electron Capture	40.00

191_m	128 milliseconds	Alpha Decay	75.00

		Electron Capture	< 50.00

192	34.6 seconds	Electron Capture	88.00

		Alpha Decay	12.00

192_m	39.6 seconds	Electron Capture	90.00

		Alpha Decay	10.00

193	67 seconds	Electron Capture	96.50

		Alpha Decay	3.50

193_m	3.2 seconds	Alpha Decay	90.00

		Electron Capture	10.00

194	95 seconds	Electron Capture	99.54

		Alpha Decay	0.46

194_m	115 seconds	Electron Capture	99.80

		Alpha Decay	0.20

194_m2	125 seconds	Electron Capture	100.00

195	183 seconds	Electron Capture	99.97

		Alpha Decay	0.03

195_m	87 seconds	Electron Capture	67.00

		Alpha Decay	33.00

196	308 seconds	Electron Capture	~ 100.00

		Alpha Decay	1.2E-3

196_m	0.6 seconds	Isomeric Transition	No Data Available

		Electron Capture	No Data Available

196_m2	240 seconds	Electron Capture	74.20

		Isomeric Transition	25.80

		Alpha Decay	3.8E-4

197	9.33 minutes	Electron Capture	100.00

		Alpha Decay	1.0E-4

197_m	5.04 minutes	Alpha Decay	55.00

		Electron Capture	45.00

		Isomeric Transition	< 0.30

198	10.3 minutes	Electron Capture	100.00

198_m	11.6 minutes	Electron Capture	100.00

198_m2	7.7 seconds	Isomeric Transition	100.00

199	27 minutes	Electron Capture	100.00

199_m	24.70 minutes	Electron Capture	>= 98.00

		Isomeric Transition	<= 2.00

		Alpha Decay	~ 0.01

200	36.4 minutes	Electron Capture	100.00

200_m	31 minutes	Electron Capture	> 90.00

		Isomeric Transition	< 10.00

200_m2	0.40 seconds	Isomeric Transition	100.00

201	108 minutes	Electron Capture	100.00

		Alpha Decay	< 1.0E-4

201_m	59.1 minutes	Electron Capture	> 93.00

		Isomeric Transition	<= 6.80

		Alpha Decay	~ 0.30

202	1.72 hours	Electron Capture	100.00

		Alpha Decay	< 1.0E-5

203	11.76 hours	Electron Capture	100.00

		Alpha Decay	~ 1.0E-5

203_m	303 milliseconds	Isomeric Transition	100.00

204	11.22 hours	Electron Capture	100.00

205	15.31 days	Electron Capture	100.00

206	6.243 days	Electron Capture	100.00

207	32.9 years	Electron Capture	100.00

207_m	182 microseconds	Isomeric Transition	100.00

208	3.68×10⁺⁵ years	Electron Capture	100.00

209	1.9×10⁺¹⁹ years	Alpha Decay	100.00

210	5.013 days	Beta-minus Decay	100.00

		Alpha Decay	1.3E-4

210_m	3.04×10⁺⁶ years	Alpha Decay	100.00

211	2.14 minutes	Alpha Decay	99.72

		Beta-minus Decay	0.28

212	60.55 minutes	Beta-minus Decay	64.06

		Alpha Decay	35.94

		Beta-minus Decay with delayed Alpha Decay	0.014

212_m	25.0 minutes	Alpha Decay	67.00

		Beta-minus Decay	33.00

212_m2	7.0 minutes	Beta-minus Decay	100.00

213	45.59 minutes	Beta-minus Decay	97.91

		Alpha Decay	2.09

214	19.9 minutes	Beta-minus Decay	99.98

		Alpha Decay	0.02

215	7.6 minutes	Beta-minus Decay	100.00

215_m	36.4 seconds	Isomeric Transition	No Data Available

		Beta-minus Decay	No Data Available

216	2.17 minutes	Beta-minus Decay	<= 100.00

217	97 seconds	Beta-minus Decay	No Data Available