Isotopes of the Element Lead

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 Lead with a Known Natural Abundance

Mass Number	Natural Abundance	Half-life

204	1.4%	≥ 1.4×10⁺¹⁷ years

206	24.1%	Stable

207	22.1%	Stable

208	52.4%	Stable

All Known Isotopes of the Element Lead

Mass Number	Half-life	Decay Mode	Branching Percentage

180	4 milliseconds	Alpha Decay	100.00

181	45 milliseconds	Alpha Decay	< 100.00

		Electron Capture	~ 2.00

182	55 milliseconds	Alpha Decay	<= 100.00

183	300 milliseconds	Alpha Decay	~ 94.00

		Electron Capture	~ 6.00

184	0.55 seconds	Alpha Decay	> 0.00

		Electron Capture	No Data Available

185	4.1 seconds	Alpha Decay	<= 100.00

186	4.82 seconds	Alpha Decay	38.00

		Electron Capture	No Data Available

187	15.2 seconds	Electron Capture	93.00

		Alpha Decay	7.00

187_m	18.3 seconds	Electron Capture	88.00

		Alpha Decay	12.00

188	24.2 seconds	Electron Capture	90.70

		Alpha Decay	9.30

189	51 seconds	Electron Capture	> 99.00

		Alpha Decay	~ 0.40

190	1.2 minutes	Electron Capture	99.10

		Alpha Decay	0.90

191	1.33 minutes	Electron Capture	99.99

		Alpha Decay	0.01

191_m	2.18 minutes	Electron Capture	100.00

		Alpha Decay	~ 0.02

192	3.5 minutes	Electron Capture	99.99

		Alpha Decay	5.9E-3

193	No Data Available	Electron Capture	No Data Available

193_m	5.8 minutes	Electron Capture	100.00

194	12.0 minutes	Electron Capture	100.00

		Alpha Decay	7.3E-6

195	≈ 15 minutes	Electron Capture	100.00

195_m	15.0 minutes	Electron Capture	100.00

196	37 minutes	Electron Capture	~ 100.00

		Alpha Decay	<= 3.0E-5

197	8 minutes	Electron Capture	100.00

197_m	43 minutes	Electron Capture	81.00

		Isomeric Transition	19.00

198	2.4 hours	Electron Capture	100.00

199	90 minutes	Electron Capture	100.00

199_m	12.2 minutes	Isomeric Transition	< 100.00

		Electron Capture	> 0.00

200	21.5 hours	Electron Capture	100.00

201	9.33 hours	Electron Capture	100.00

201_m	61 seconds	Isomeric Transition	> 99.00

		Electron Capture	< 1.00

202	52.5×10⁺³ years	Electron Capture	100.00

		Alpha Decay	< 1.00

202_m	3.53 hours	Isomeric Transition	90.50

		Electron Capture	9.50

203	51.873 hours	Electron Capture	100.00

203_m	6.3 seconds	Isomeric Transition	100.00

203_m2	0.48 seconds	Isomeric Transition	100.00

204	≥ 1.4×10⁺¹⁷ years	Alpha Decay	No Data Available

204_m	67.2 minutes	Isomeric Transition	100.00

205	1.53×10⁺⁷ years	Electron Capture	100.00

206	Stable	-	-

207	Stable	-	-

207_m	0.806 seconds	Isomeric Transition	100.00

208	Stable	-	-

209	3.253 hours	Beta-minus Decay	100.00

210	22.3 years	Beta-minus Decay	100.00

		Alpha Decay	1.9E-6

211	36.1 minutes	Beta-minus Decay	100.00

212	10.64 hours	Beta-minus Decay	100.00

213	10.2 minutes	Beta-minus Decay	100.00

214	26.8 minutes	Beta-minus Decay	100.00

This page is maintained by Steve Gagnon.

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