It's Elemental - Isotopes of the Element Terbium

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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 Terbium with a Known Natural Abundance

Mass Number	Natural Abundance	Half-life

159	100%	Stable

All Known Isotopes of the Element Terbium

Mass Number	Half-life	Decay Mode	Branching Percentage

138	≈ 0.4 seconds	Electron Capture	No Data Available

139	1.6 seconds	No Data Available	No Data Available

140	2.4 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	0.26

141	3.5 seconds	Electron Capture	100.00

141_m	7.9 seconds	Electron Capture	100.00

142	597 milliseconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	2.2E-3

142_m	303 milliseconds	Isomeric Transition	100.00

142_m2	15 microseconds	Isomeric Transition	100.00

143	12 seconds	Electron Capture	100.00

143_m	< 21 seconds	Electron Capture	No Data Available

144	≈ 1 seconds	Electron Capture	100.00

144_m	4.25 seconds	Isomeric Transition	66.00

		Electron Capture	34.00

145	≈ 20 minutes	Electron Capture	No Data Available

145_m	30.9 seconds	Electron Capture	100.00

146	8 seconds	Electron Capture	100.00

146_m	23 seconds	Electron Capture	100.00

147	1.7 hours	Electron Capture	100.00

147_m	1.83 minutes	Electron Capture	100.00

148	60 minutes	Electron Capture	100.00

148_m	2.20 minutes	Electron Capture	100.00

149	4.118 hours	Electron Capture	83.30

		Alpha Decay	16.70

149_m	4.16 minutes	Electron Capture	99.98

		Alpha Decay	0.02

150	3.48 hours	Electron Capture	100.00

		Alpha Decay	< 0.05

150_m	5.8 minutes	Electron Capture	100.00

151	17.609 hours	Electron Capture	100.00

		Alpha Decay	9.5E-3

151_m	25 seconds	Isomeric Transition	93.80

		Electron Capture	6.20

152	17.5 hours	Electron Capture	100.00

		Alpha Decay	< 7.0E-7

152_m	4.2 minutes	Isomeric Transition	78.80

		Electron Capture	21.20

153	2.34 days	Electron Capture	100.00

154	21.5 hours	Electron Capture	100.00

		Beta-minus Decay	< 0.10

154_m	9.4 hours	Electron Capture	78.20

		Isomeric Transition	21.80

		Beta-minus Decay	< 0.10

154_m2	22.7 hours	Electron Capture	98.20

		Isomeric Transition	1.80

155	5.32 days	Electron Capture	100.00

156	5.35 days	Electron Capture	100.00

		Beta-minus Decay	No Data Available

156_m	24.4 hours	Isomeric Transition	100.00

156_m2	5.3 hours	Electron Capture	No Data Available

		Isomeric Transition	No Data Available

157	71 years	Electron Capture	100.00

158	180 years	Electron Capture	83.40

		Beta-minus Decay	16.60

158_m	10.70 seconds	Isomeric Transition	100.00

		Beta-minus Decay	< 0.60

		Electron Capture	< 0.01

159	Stable	-	-

160	72.3 days	Beta-minus Decay	100.00

161	6.906 days	Beta-minus Decay	100.00

162	7.60 minutes	Beta-minus Decay	100.00

163	19.5 minutes	Beta-minus Decay	100.00

164	3.0 minutes	Beta-minus Decay	100.00

165	2.11 minutes	Beta-minus Decay	100.00

166	21 seconds	Beta-minus Decay	100.00

167	19.4 seconds	Beta-minus Decay	100.00

168	8.2 seconds	Beta-minus Decay	100.00

169	≈ 2 seconds	Beta-minus Decay	No Data Available

170	≈ 3 seconds	Beta-minus Decay	No Data Available

171	≈ 0.5 seconds	Beta-minus Decay	No Data Available