It's Elemental - Isotopes of the Element Gadolinium

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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 Gadolinium with a Known Natural Abundance

Mass Number	Natural Abundance	Half-life

152	0.20%	1.08×10⁺¹⁴ years

154	2.18%	Stable

155	14.80%	Stable

156	20.47%	Stable

157	15.65%	Stable

158	24.84%	Stable

160	21.86%	≥ 1.3×10⁺²¹ years

All Known Isotopes of the Element Gadolinium

Mass Number	Half-life	Decay Mode	Branching Percentage

135	1.1 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	~ 2.00

136	≥ 200 nanoseconds	No Data Available	No Data Available

137	7 seconds	Electron Capture	100.00

138	≈ 5 seconds	Electron Capture	No Data Available

139	5.8 seconds	Electron Capture	> 0.00

		Electron Capture with delayed Proton Emission	> 0.00

139_m	4.8 seconds	Electron Capture	> 0.00

		Electron Capture with delayed Proton Emission	> 0.00

140	15.8 seconds	Electron Capture	100.00

141	14 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	0.03

141_m	24.5 seconds	Electron Capture	89.00

		Isomeric Transition	11.00

142	70.2 seconds	Electron Capture	100.00

143	39 seconds	Electron Capture	100.00

143_m	110.0 seconds	Electron Capture	100.00

144	4.47 minutes	Electron Capture	100.00

145	23.0 minutes	Electron Capture	100.00

145_m	85 seconds	Isomeric Transition	94.30

		Electron Capture	5.70

146	48.27 days	Electron Capture	100.00

147	38.06 hours	Electron Capture	100.00

148	74.6 years	Alpha Decay	100.00

149	9.28 days	Electron Capture	100.00

		Alpha Decay	4.3E-4

150	1.79×10⁺⁶ years	Alpha Decay	100.00

151	124 days	Electron Capture	100.00

		Alpha Decay	~ 8.0E-7

152	1.08×10⁺¹⁴ years	Alpha Decay	100.00

153	240.4 days	Electron Capture	100.00

154	Stable	-	-

155	Stable	-	-

156	Stable	-	-

157	Stable	-	-

158	Stable	-	-

159	18.479 hours	Beta-minus Decay	100.00

160	≥ 1.3×10⁺²¹ years	Double Beta-minus Decay	No Data Available

161	3.66 minutes	Beta-minus Decay	100.00

162	8.4 minutes	Beta-minus Decay	100.00

163	68 seconds	Beta-minus Decay	100.00

164	45 seconds	Beta-minus Decay	100.00

165	10.3 seconds	Beta-minus Decay	100.00

166	≈ 7 seconds	Beta-minus Decay	No Data Available

167	≈ 3 seconds	Beta-minus Decay	No Data Available

168	≈ 0.3 seconds	Beta-minus Decay	No Data Available

169	≈ 1 seconds	Beta-minus Decay	No Data Available