It's Elemental - Isotopes of the Element Erbium

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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 Erbium with a Known Natural Abundance

Mass Number	Natural Abundance	Half-life

162	0.139%	Stable

164	1.601%	Stable

166	33.503%	Stable

167	22.869%	Stable

168	26.978%	Stable

170	14.910%	Stable

All Known Isotopes of the Element Erbium

Mass Number	Half-life	Decay Mode	Branching Percentage

144	≥ 200 nanoseconds	No Data Available	No Data Available

145	0.9 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	No Data Available

146	1.7 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	100.00

147	2.5 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	> 0.00

147_m	≈ 2.5 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	> 0.00

148	4.6 seconds	Electron Capture	100.00

149	4 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	7.00

149_m	8.9 seconds	Electron Capture	96.50

		Isomeric Transition	3.50

		Electron Capture with delayed Proton Emission	0.18

150	18.5 seconds	Electron Capture	100.00

151	23.5 seconds	Electron Capture	100.00

151_m	0.58 seconds	Isomeric Transition	95.30

		Electron Capture	4.70

152	10.3 seconds	Alpha Decay	90.00

		Electron Capture	10.00

153	37.1 seconds	Alpha Decay	53.00

		Electron Capture	47.00

154	3.73 minutes	Electron Capture	99.53

		Alpha Decay	0.47

154_m	39 nanoseconds	Isomeric Transition	~ 100.00

		Alpha Decay	~ 0.00

155	5.3 minutes	Electron Capture	99.98

		Alpha Decay	0.02

156	19.5 minutes	Electron Capture	~ 100.00

		Alpha Decay	7.0E-6

157	18.65 minutes	Electron Capture	~ 100.00

		Alpha Decay	< 0.02

158	2.29 hours	Electron Capture	100.00

159	36 minutes	Electron Capture	100.00

160	28.58 hours	Electron Capture	100.00

161	3.21 hours	Electron Capture	100.00

161_m	7.5 microseconds	Isomeric Transition	100.00

162	Stable	-	-

163	75.0 minutes	Electron Capture	100.00

164	Stable	-	-

165	10.36 hours	Electron Capture	100.00

166	Stable	-	-

167	Stable	-	-

167_m	2.269 seconds	Isomeric Transition	100.00

168	Stable	-	-

169	9.40 days	Beta-minus Decay	100.00

170	Stable	-	-

171	7.516 hours	Beta-minus Decay	100.00

172	49.3 hours	Beta-minus Decay	100.00

173	1.4 minutes	Beta-minus Decay	100.00

174	3.2 minutes	Beta-minus Decay	100.00

175	1.2 minutes	Beta-minus Decay	100.00

176	≈ 20 seconds	Beta-minus Decay	No Data Available

177	≈ 3 seconds	Beta-minus Decay	No Data Available