It's Elemental - Isotopes of the Element Lanthanum

Isotopes of the Element Lanthanum
[Click for Main Data]

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 Lanthanum with a Known Natural Abundance

Mass Number	Natural Abundance	Half-life

138	0.090%	1.05×10⁺¹¹ years

139	99.910%	Stable

All Known Isotopes of the Element Lanthanum

Mass Number	Half-life	Decay Mode	Branching Percentage

117	23.5 milliseconds	Proton Emission	93.90

		Electron Capture	6.10

117_m	10 milliseconds	Proton Emission	97.40

		Electron Capture	2.60

118	≈ 1 seconds	Electron Capture	No Data Available

119	≈ 2 seconds	Electron Capture	No Data Available

120	2.8 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	> 0.00

121	5.3 seconds	Electron Capture	100.00

122	8.7 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	No Data Available

123	17 seconds	Electron Capture	100.00

124	< 1 seconds	Electron Capture	100.00

124_m	29 seconds	Electron Capture	100.00

125	64.8 seconds	Electron Capture	100.00

125_m	0.4 seconds	Isomeric Transition	No Data Available

126	< 50 seconds	Electron Capture	No Data Available

126_m	54 seconds	Electron Capture	No Data Available

127	5.1 minutes	Electron Capture	100.00

127_m	3.7 minutes	Electron Capture	100.00

		Isomeric Transition	No Data Available

128	5.18 minutes	Electron Capture	100.00

128_m	< 1.4 minutes	Electron Capture	100.00

129	11.6 minutes	Electron Capture	100.00

129_m	0.56 seconds	Isomeric Transition	100.00

130	8.7 minutes	Electron Capture	100.00

131	59 minutes	Electron Capture	100.00

132	4.8 hours	Electron Capture	100.00

132_m	24.3 minutes	Isomeric Transition	76.00

		Electron Capture	24.00

133	3.912 hours	Electron Capture	100.00

134	6.45 minutes	Electron Capture	100.00

135	19.5 hours	Electron Capture	100.00

136	9.87 minutes	Electron Capture	100.00

136_m	114 milliseconds	Isomeric Transition	100.00

137	6×10⁺⁴ years	Electron Capture	100.00

138	1.05×10⁺¹¹ years	Electron Capture	66.40

		Beta-minus Decay	33.60

139	Stable	-	-

140	1.6781 days	Beta-minus Decay	100.00

141	3.92 hours	Beta-minus Decay	100.00

142	91.1 minutes	Beta-minus Decay	100.00

143	14.2 minutes	Beta-minus Decay	100.00

144	40.8 seconds	Beta-minus Decay	100.00

145	24.8 seconds	Beta-minus Decay	100.00

146	6.27 seconds	Beta-minus Decay	100.00

146_m	10.0 seconds	Beta-minus Decay	100.00

147	4.015 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	0.04

148	1.26 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	0.15

149	1.05 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	1.40

150	0.51 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	2.70

151	> 150 nanoseconds	Beta-minus Decay	No Data Available

152	> 150 nanoseconds	Beta-minus Decay	No Data Available

153	> 150 nanoseconds	Beta-minus Decay	No Data Available

154	≈ 0.1 seconds	Beta-minus Decay	No Data Available

155	≈ 0.06 seconds	Beta-minus Decay	No Data Available

Isotopes of the Element Lanthanum[Click for Main Data]

Isotopes of the Element Lanthanum
[Click for Main Data]