It's Elemental - Isotopes of the Element Thulium

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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 Thulium with a Known Natural Abundance

Mass Number	Natural Abundance	Half-life

169	100%	Stable

All Known Isotopes of the Element Thulium

Mass Number	Half-life	Decay Mode	Branching Percentage

145	3.5 microseconds	Proton Emission	100.00

146	235 milliseconds	Proton Emission	No Data Available

		Electron Capture	No Data Available

146_m	72 milliseconds	Proton Emission	No Data Available

		Electron Capture	No Data Available

147	0.58 seconds	Electron Capture	85.00

		Proton Emission	15.00

147_m	0.36 milliseconds	Proton Emission	100.00

148	0.7 seconds	Electron Capture	100.00

149	0.9 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	0.20

150	2.2 seconds	Electron Capture	100.00

151	4.17 seconds	Electron Capture	100.00

151_m	6.6 seconds	Electron Capture	100.00

152	8.0 seconds	Electron Capture	100.00

152_m	5.2 seconds	Electron Capture	100.00

153	1.48 seconds	Alpha Decay	91.00

		Electron Capture	9.00

153_m	2.5 seconds	Alpha Decay	92.00

		Electron Capture	8.00

154	8.1 seconds	Alpha Decay	54.00

		Electron Capture	46.00

154_m	3.30 seconds	Alpha Decay	58.00

		Electron Capture	42.00

		Isomeric Transition	No Data Available

155	21.6 seconds	Electron Capture	98.10

		Alpha Decay	1.90

155_m	45 seconds	Electron Capture	> 92.00

		Alpha Decay	< 8.00

156	83.8 seconds	Electron Capture	99.94

		Alpha Decay	0.06

156_m	19 seconds	Alpha Decay	No Data Available

157	3.63 minutes	Electron Capture	100.00

158	3.98 minutes	Electron Capture	100.00

159	9.13 minutes	Electron Capture	100.00

160	9.4 minutes	Electron Capture	100.00

160_m	74.5 seconds	Isomeric Transition	85.00

		Electron Capture	15.00

161	30.2 minutes	Electron Capture	100.00

162	21.70 minutes	Electron Capture	100.00

162_m	24.3 seconds	Isomeric Transition	82.00

		Electron Capture	18.00

163	1.810 hours	Electron Capture	100.00

164	2.0 minutes	Electron Capture	100.00

		Electron Capture	39.00

164_m	5.1 minutes	Isomeric Transition	~ 80.00

		Electron Capture	~ 20.00

165	30.06 hours	Electron Capture	100.00

166	7.70 hours	Electron Capture	100.00

167	9.25 days	Electron Capture	100.00

168	93.1 days	Electron Capture	99.99

		Beta-minus Decay	0.01

169	Stable	-	-

170	128.6 days	Beta-minus Decay	99.87

		Electron Capture	0.13

171	1.92 years	Beta-minus Decay	100.00

172	63.6 hours	Beta-minus Decay	100.00

173	8.24 hours	Beta-minus Decay	100.00

174	5.4 minutes	Beta-minus Decay	100.00

175	15.2 minutes	Beta-minus Decay	100.00

176	1.9 minutes	Beta-minus Decay	100.00

177	85 seconds	Beta-minus Decay	100.00

178	≈ 30 seconds	Beta-minus Decay	No Data Available

179	≈ 20 seconds	Beta-minus Decay	No Data Available