It's Elemental - Isotopes of the Element Tantalum

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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 Tantalum with a Known Natural Abundance

Mass Number	Natural Abundance	Half-life

180	0.012%	> 1.2×10⁺¹⁵ years

181	99.988%	Stable

All Known Isotopes of the Element Tantalum

Mass Number	Half-life	Decay Mode	Branching Percentage

155	12 microseconds	Proton Emission	100.00

156	144 milliseconds	Proton Emission	59.00

		Electron Capture	41.00

156_m	375 milliseconds	Electron Capture	95.80

		Proton Emission	4.20

157	10.1 milliseconds	Alpha Decay	96.60

		Proton Emission	3.40

157_m	4.3 milliseconds	Alpha Decay	100.00

157_m2	1.7 milliseconds	Alpha Decay	100.00

158	72 milliseconds	Alpha Decay	No Data Available

158_m	37.7 milliseconds	Alpha Decay	93.00

		Electron Capture	7.00

159	0.544 seconds	Alpha Decay	80.00

		Electron Capture	20.00

159_m	1.1 seconds	Alpha Decay	No Data Available

160	1.55 seconds	Electron Capture	66.00

		Alpha Decay	34.00

161	2.89 seconds	No Data Available	No Data Available

162	3.57 seconds	Electron Capture	99.93

		Alpha Decay	0.07

163	10.6 seconds	Electron Capture	~ 99.80

		Alpha Decay	~ 0.20

164	14.2 seconds	Electron Capture	100.00

165	31.0 seconds	Electron Capture	100.00

166	34.4 seconds	Electron Capture	100.00

167	80 seconds	Electron Capture	100.00

168	2.0 minutes	Electron Capture	100.00

169	4.9 minutes	Electron Capture	100.00

170	6.76 minutes	Electron Capture	100.00

171	23.3 minutes	Electron Capture	100.00

172	36.8 minutes	Electron Capture	100.00

173	3.14 hours	Electron Capture	100.00

174	1.14 hours	Electron Capture	100.00

175	10.5 hours	Electron Capture	100.00

176	8.09 hours	Electron Capture	100.00

176_m	1.1 milliseconds	Isomeric Transition	100.00

176_m2	0.97 milliseconds	Isomeric Transition	100.00

177	56.56 hours	Electron Capture	100.00

178	9.31 minutes	Electron Capture	100.00

178_m	2.36 hours	Electron Capture	100.00

179	1.82 years	Electron Capture	100.00

179_m	9.0 milliseconds	No Data Available	No Data Available

179_m2	54.1 milliseconds	No Data Available	No Data Available

180	8.152 hours	Electron Capture	86.00

		Beta-minus Decay	14.00

180_m	> 1.2×10⁺¹⁵ years	Beta-minus Decay	No Data Available

		Electron Capture	No Data Available

181	Stable	-	-

182	114.43 days	Beta-minus Decay	100.00

182_m	283 milliseconds	Isomeric Transition	100.00

182_m2	15.84 minutes	Isomeric Transition	100.00

183	5.1 days	Beta-minus Decay	100.00

184	8.7 hours	Beta-minus Decay	100.00

185	49.4 minutes	Beta-minus Decay	100.00

186	10.5 minutes	Beta-minus Decay	100.00

187	≈ 2 minutes	Beta-minus Decay	No Data Available

188	≈ 20 seconds	Beta-minus Decay	No Data Available