It's Elemental - Isotopes of the Element Lutetium

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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 Lutetium with a Known Natural Abundance

Mass Number	Natural Abundance	Half-life

175	97.41%	Stable

176	2.59%	4.00×10⁺¹⁰ years

All Known Isotopes of the Element Lutetium

Mass Number	Half-life	Decay Mode	Branching Percentage

150	46 milliseconds	Proton Emission	70.00

		Electron Capture	30.00

150_m	30 microseconds	Proton Emission	100.00

151	80.6 milliseconds	Proton Emission	63.40

		Electron Capture	36.60

151_m	16 microseconds	Proton Emission	100.00

152	0.7 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	15.00

153	0.9 seconds	Alpha Decay	~ 70.00

		Electron Capture	~ 30.00

154	≈ 2 seconds	Electron Capture	No Data Available

154_m	1.12 seconds	Electron Capture	~ 100.00

155	70 milliseconds	Alpha Decay	79.00

		Electron Capture	21.00

155_m	136 milliseconds	Electron Capture	No Data Available

		Alpha Decay	No Data Available

155_m2	2.71 milliseconds	Alpha Decay	100.00

156	198 milliseconds	Alpha Decay	>= 75.00

		Electron Capture	<= 25.00

156_m	494 milliseconds	Alpha Decay	~ 95.00

		Electron Capture	5.00

157	6.8 seconds	Alpha Decay	> 0.00

157_m	4.79 seconds	Electron Capture	94.00

		Alpha Decay	6.00

158	10.6 seconds	Electron Capture	99.09

		Alpha Decay	0.91

159	12.1 seconds	Electron Capture	100.00

		Alpha Decay	0.04

160	36.1 seconds	Electron Capture	100.00

		Alpha Decay	<= 1.0E-4

160_m	40 seconds	Electron Capture	<= 100.00

		Alpha Decay	No Data Available

161	77 seconds	Electron Capture	100.00

161_m	7.3 milliseconds	Isomeric Transition	100.00

162	1.37 minutes	Electron Capture	<= 100.00

162_m	1.5 minutes	Electron Capture	<= 100.00

162_m2	1.9 minutes	Electron Capture	<= 100.00

163	3.97 minutes	Electron Capture	100.00

164	3.14 minutes	Electron Capture	100.00

165	10.74 minutes	Electron Capture	100.00

166	2.65 minutes	Electron Capture	100.00

166_m	1.41 minutes	Electron Capture	58.00

		Isomeric Transition	42.00

166_m2	2.12 minutes	Electron Capture	> 80.00

		Isomeric Transition	< 20.00

167	51.5 minutes	Electron Capture	100.00

167_m	≥ 1 minutes	Electron Capture	No Data Available

		Isomeric Transition	No Data Available

168	5.5 minutes	Electron Capture	100.00

168_m	6.7 minutes	Electron Capture	> 95.00

		Isomeric Transition	< 5.00

169	34.06 hours	Electron Capture	100.00

169_m	160 seconds	Isomeric Transition	100.00

170	2.012 days	Electron Capture	100.00

170_m	0.67 seconds	Isomeric Transition	100.00

171	8.24 days	Electron Capture	100.00

171_m	79 seconds	Isomeric Transition	100.00

172	6.70 days	Electron Capture	100.00

172_m	3.7 minutes	Isomeric Transition	100.00

173	1.37 years	Electron Capture	100.00

174	3.31 years	Electron Capture	100.00

174_m	142 days	Isomeric Transition	99.38

		Electron Capture	0.62

175	Stable	-	-

176	4.00×10⁺¹⁰ years	Beta-minus Decay	100.00

176_m	3.664 hours	Beta-minus Decay	99.91

		Electron Capture	0.10

177	6.734 days	Beta-minus Decay	100.00

177_m	160.4 days	Beta-minus Decay	78.30

		Isomeric Transition	21.70

178	28.4 minutes	Beta-minus Decay	100.00

178_m	23.1 minutes	Beta-minus Decay	100.00

179	4.59 hours	Beta-minus Decay	100.00

179_m	3.1 milliseconds	No Data Available	No Data Available

180	5.7 minutes	Beta-minus Decay	100.00

181	3.5 minutes	Beta-minus Decay	100.00

182	2.0 minutes	Beta-minus Decay	100.00

183	58 seconds	Beta-minus Decay	100.00

184	20 seconds	Beta-minus Decay	100.00