It's Elemental - Isotopes of the Element Holmium

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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 Holmium with a Known Natural Abundance

Mass Number	Natural Abundance	Half-life

165	100%	Stable

All Known Isotopes of the Element Holmium

Mass Number	Half-life	Decay Mode	Branching Percentage

140	6 milliseconds	Proton Emission	100.00

141	4.1 milliseconds	Proton Emission	100.00

141_m	6.6 microseconds	Proton Emission	100.00

142	≈ 0.3 seconds	Electron Capture	No Data Available

143	No Data Available	Electron Capture	No Data Available

		Electron Capture with delayed Proton Emission	No Data Available

144	0.7 seconds	Electron Capture	No Data Available

		Electron Capture with delayed Proton Emission	No Data Available

145	2.4 seconds	Electron Capture	100.00

146	3.6 seconds	Electron Capture	100.00

147	5.8 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	No Data Available

148	2.2 seconds	Electron Capture	100.00

148_m	9.59 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	0.08

148_m2	2.35 milliseconds	Isomeric Transition	100.00

149	21.1 seconds	Electron Capture	100.00

149_m	56 seconds	Electron Capture	100.00

150	72 seconds	Electron Capture	100.00

150_m	23.3 seconds	Electron Capture	100.00

151	35.2 seconds	Electron Capture	78.00

		Alpha Decay	22.00

151_m	47.2 seconds	Alpha Decay	80.00

		Electron Capture	20.00

152	161.8 seconds	Electron Capture	88.00

		Alpha Decay	12.00

152_m	50.0 seconds	Electron Capture	89.20

		Alpha Decay	10.80

153	2.01 minutes	Electron Capture	99.95

		Alpha Decay	0.05

153_m	9.3 minutes	Electron Capture	99.82

		Alpha Decay	0.18

154	11.76 minutes	Electron Capture	99.98

		Alpha Decay	0.02

154_m	3.10 minutes	Electron Capture	100.00

		Alpha Decay	< 1.0E-3

		Isomeric Transition	~ 0.00

155	48 minutes	Electron Capture	100.00

156	56 minutes	Electron Capture	100.00

157	12.6 minutes	Electron Capture	100.00

158	11.3 minutes	Electron Capture	100.00

158_m	28 minutes	Isomeric Transition	> 81.00

		Electron Capture	< 19.00

158_m2	21.3 minutes	Electron Capture	>= 93.00

		Isomeric Transition	<= 7.00

159	33.05 minutes	Electron Capture	100.00

159_m	8.30 seconds	Isomeric Transition	100.00

160	25.6 minutes	Electron Capture	100.00

160_m	5.02 hours	Isomeric Transition	65.00

		Electron Capture	35.00

160_m2	3 seconds	Isomeric Transition	100.00

161	2.48 hours	Electron Capture	100.00

161_m	6.76 seconds	Isomeric Transition	100.00

162	15.0 minutes	Electron Capture	100.00

162_m	67.0 minutes	Isomeric Transition	62.00

		Electron Capture	38.00

163	4570 years	Electron Capture	100.00

163_m	1.09 seconds	Isomeric Transition	100.00

164	29 minutes	Electron Capture	60.00

		Beta-minus Decay	40.00

164_m	37.5 minutes	Isomeric Transition	100.00

165	Stable	-	-

166	26.83 hours	Beta-minus Decay	100.00

166_m	1.20×10⁺³ years	Beta-minus Decay	100.00

167	3.1 hours	Beta-minus Decay	100.00

168	2.99 minutes	Beta-minus Decay	100.00

168_m	132 seconds	Isomeric Transition	>= 99.50

		Beta-minus Decay	<= 0.50

169	4.7 minutes	Beta-minus Decay	100.00

170	2.76 minutes	Beta-minus Decay	100.00

170_m	43 seconds	Beta-minus Decay	100.00

171	53 seconds	Beta-minus Decay	100.00

172	25 seconds	Beta-minus Decay	100.00

173	≈ 10 seconds	Beta-minus Decay	No Data Available

174	≈ 8 seconds	Beta-minus Decay	No Data Available

175	≈ 5 seconds	Beta-minus Decay	No Data Available