It's Elemental - Isotopes of the Element Samarium

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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 Samarium with a Known Natural Abundance

Mass Number	Natural Abundance	Half-life

144	3.07%	Stable

147	14.99%	1.06×10⁺¹¹ years

148	11.24%	7×10⁺¹⁵ years

149	13.82%	> 2×10⁺¹⁵ years

150	7.38%	Stable

152	26.75%	Stable

154	22.75%	Stable

All Known Isotopes of the Element Samarium

Mass Number	Half-life	Decay Mode	Branching Percentage

130	No Data Available	Electron Capture	No Data Available

131	1.2 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	> 0.00

132	4.0 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	No Data Available

133	3.7 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	> 0.00

134	10 seconds	Electron Capture	100.00

135	10.3 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	0.02

136	47 seconds	Electron Capture	100.00

137	45 seconds	Electron Capture	100.00

138	3.1 minutes	Electron Capture	100.00

139	2.57 minutes	Electron Capture	100.00

139_m	10.7 seconds	Isomeric Transition	93.70

		Electron Capture	6.30

140	14.82 minutes	Electron Capture	100.00

141	10.2 minutes	Electron Capture	100.00

141_m	22.6 minutes	Electron Capture	99.69

		Isomeric Transition	0.31

142	72.49 minutes	Electron Capture	100.00

143	8.75 minutes	Electron Capture	100.00

143_m	66 seconds	Isomeric Transition	99.76

		Electron Capture	0.24

143_m2	30 milliseconds	Isomeric Transition	100.00

144	Stable	-	-

145	340 days	Electron Capture	100.00

145_m	0.96 microseconds	Isomeric Transition	100.00

146	10.3×10⁺⁷ years	Alpha Decay	100.00

147	1.06×10⁺¹¹ years	Alpha Decay	100.00

148	7×10⁺¹⁵ years	Alpha Decay	100.00

149	> 2×10⁺¹⁵ years	Alpha Decay	No Data Available

150	Stable	-	-

151	90 years	Beta-minus Decay	100.00

152	Stable	-	-

153	46.284 hours	Beta-minus Decay	100.00

154	Stable	-	-

155	22.3 minutes	Beta-minus Decay	100.00

156	9.4 hours	Beta-minus Decay	100.00

157	482 seconds	Beta-minus Decay	100.00

158	5.30 minutes	Beta-minus Decay	100.00

159	11.37 seconds	Beta-minus Decay	100.00

160	9.6 seconds	Beta-minus Decay	100.00

161	4.8 seconds	Beta-minus Decay	100.00

162	≈ 2 seconds	Beta-minus Decay	No Data Available

163	≈ 1 seconds	Beta-minus Decay	No Data Available

164	≈ 0.5 seconds	Beta-minus Decay	No Data Available

165	≈ 0.2 seconds	Beta-minus Decay	No Data Available