It's Elemental - Isotopes of the Element Hafnium

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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 Hafnium with a Known Natural Abundance

Mass Number	Natural Abundance	Half-life

174	0.16%	2.0×10⁺¹⁵ years

176	5.26%	Stable

177	18.60%	Stable

178	27.28%	Stable

179	13.62%	Stable

180	35.08%	Stable

All Known Isotopes of the Element Hafnium

Mass Number	Half-life	Decay Mode	Branching Percentage

154	2 seconds	Electron Capture	~ 100.00

		Alpha Decay	~ 0.00

154_m	9 microseconds	Isomeric Transition	100.00

155	0.89 seconds	Electron Capture	100.00

		Alpha Decay	No Data Available

156	23 milliseconds	Alpha Decay	100.00

157	115 milliseconds	Alpha Decay	86.00

		Electron Capture	14.00

158	2.85 seconds	Electron Capture	56.00

		Alpha Decay	44.00

159	5.2 seconds	Electron Capture	59.00

		Alpha Decay	41.00

160	13.6 seconds	Electron Capture	99.30

		Alpha Decay	0.70

161	18.2 seconds	Electron Capture	> 99.87

		Alpha Decay	< 0.13

162	39.4 seconds	Electron Capture	99.99

		Alpha Decay	8.0E-3

163	40.0 seconds	Electron Capture	100.00

		Alpha Decay	< 1.0E-4

164	111 seconds	Electron Capture	100.00

165	76 seconds	Electron Capture	100.00

166	6.77 minutes	Electron Capture	100.00

167	2.05 minutes	Electron Capture	100.00

168	25.95 minutes	Electron Capture	100.00

169	3.24 minutes	Electron Capture	100.00

170	16.01 hours	Electron Capture	100.00

171	12.1 hours	Electron Capture	100.00

172	1.87 years	Electron Capture	100.00

173	23.6 hours	Electron Capture	100.00

174	2.0×10⁺¹⁵ years	Alpha Decay	100.00

175	70 days	Electron Capture	100.00

176	Stable	-	-

177	Stable	-	-

177_m	1.08 seconds	Isomeric Transition	100.00

177_m2	51.4 minutes	Isomeric Transition	100.00

178	Stable	-	-

178_m	4.0 seconds	Isomeric Transition	100.00

178_m2	31 years	Isomeric Transition	100.00

179	Stable	-	-

179_m	18.67 seconds	Isomeric Transition	100.00

179_m2	25.05 days	Isomeric Transition	100.00

180	Stable	-	-

180_m	5.5 hours	Isomeric Transition	99.70

		Beta-minus Decay	0.30

181	42.39 days	Beta-minus Decay	100.00

182	9×10⁺⁶ years	Beta-minus Decay	100.00

182_m	61.5 minutes	Beta-minus Decay	58.00

		Isomeric Transition	42.00

183	1.067 hours	Beta-minus Decay	100.00

184	4.12 hours	Beta-minus Decay	100.00

184_m	48 seconds	Beta-minus Decay	100.00

185	3.5 minutes	Beta-minus Decay	100.00

186	2.6 minutes	Beta-minus Decay	100.00

188	No Data Available	Beta-minus Decay	No Data Available