It's Elemental - Isotopes of the Element Cerium

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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 Cerium with a Known Natural Abundance

Mass Number	Natural Abundance	Half-life

136	0.185%	> 0.7×10⁺¹⁴ years

138	0.251%	Stable

140	88.450%	Stable

142	11.114%	> 5×10⁺¹⁶ years

All Known Isotopes of the Element Cerium

Mass Number	Half-life	Decay Mode	Branching Percentage

119	≈ 0.2 seconds	Electron Capture	No Data Available

120	≈ 0.25 seconds	Electron Capture	No Data Available

121	1.1 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	~ 1.00

122	≈ 2 seconds	Electron Capture	No Data Available

		Electron Capture with delayed Proton Emission	No Data Available

123	3.8 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	No Data Available

124	6 seconds	Electron Capture	100.00

125	10.2 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	No Data Available

126	50 seconds	Electron Capture	100.00

127	31 seconds	Electron Capture	100.00

128	3.93 minutes	Electron Capture	100.00

129	3.5 minutes	Electron Capture	> 0.00

130	22.9 minutes	Electron Capture	100.00

131	10.2 minutes	Electron Capture	100.00

131_m	5.0 minutes	Electron Capture	100.00

132	3.51 hours	Electron Capture	100.00

133	97 minutes	Electron Capture	100.00

133_m	4.9 hours	Electron Capture	100.00

134	3.16 days	Electron Capture	100.00

135	17.7 hours	Electron Capture	100.00

135_m	20 seconds	Isomeric Transition	100.00

136	> 0.7×10⁺¹⁴ years	Double Electron Capture	No Data Available

137	9.0 hours	Electron Capture	100.00

137_m	34.4 hours	Isomeric Transition	99.22

		Electron Capture	0.78

138	Stable	-	-

139	137.641 days	Electron Capture	100.00

139_m	54.8 seconds	Isomeric Transition	100.00

140	Stable	-	-

141	32.508 days	Beta-minus Decay	100.00

142	> 5×10⁺¹⁶ years	No Data Available	No Data Available

143	33.039 hours	Beta-minus Decay	100.00

144	284.91 days	Beta-minus Decay	100.00

145	3.01 minutes	Beta-minus Decay	100.00

146	13.52 minutes	Beta-minus Decay	100.00

147	56.4 seconds	Beta-minus Decay	100.00

148	56 seconds	Beta-minus Decay	100.00

149	5.3 seconds	Beta-minus Decay	100.00

150	4.0 seconds	Beta-minus Decay	100.00

151	1.02 seconds	Beta-minus Decay	100.00

152	1.4 seconds	Beta-minus Decay	100.00

153	> 150 nanoseconds	Beta-minus Decay	No Data Available

154	> 150 nanoseconds	No Data Available	No Data Available

155	> 300 nanoseconds	No Data Available	No Data Available

156	≈ 0.15 seconds	Beta-minus Decay	No Data Available

157	≈ 0.05 seconds	Beta-minus Decay	No Data Available