It's Elemental - Isotopes of the Element Xenon

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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 Xenon with a Known Natural Abundance

Mass Number	Natural Abundance	Half-life

124	0.095%	≥ 1.1×10⁺¹⁷ years

126	0.089%	Stable

128	1.910%	Stable

129	26.40%	Stable

130	4.071%	Stable

131	21.232%	Stable

132	26.909%	Stable

134	10.436%	Stable

136	8.857%	> 3.6×10⁺²⁰ years

All Known Isotopes of the Element Xenon

Mass Number	Half-life	Decay Mode	Branching Percentage

110	≈ 0.2 seconds	Alpha Decay	No Data Available

		Electron Capture	No Data Available

111	0.74 seconds	Electron Capture	No Data Available

		Alpha Decay	No Data Available

112	2.7 seconds	Electron Capture	99.16

		Alpha Decay	0.84

113	2.74 seconds	Electron Capture	~ 100.00

		Electron Capture with delayed Proton Emission	7.00

		Alpha Decay	~ 0.01

		Electron Capture with delayed Alpha Decay	~ 7.0E-3

114	10.0 seconds	Electron Capture	100.00

115	18 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	0.34

116	59 seconds	Electron Capture	100.00

117	61 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	2.9E-3

118	3.8 minutes	Electron Capture	100.00

119	5.8 minutes	Electron Capture	100.00

120	40 minutes	Electron Capture	100.00

121	40.1 minutes	Electron Capture	100.00

122	20.1 hours	Electron Capture	100.00

123	2.08 hours	Electron Capture	100.00

124	≥ 1.1×10⁺¹⁷ years	Double Electron Capture	No Data Available

125	16.9 hours	Electron Capture	100.00

125_m	56.9 seconds	Isomeric Transition	100.00

126	Stable	-	-

127	36.4 days	Electron Capture	100.00

127_m	69.2 seconds	Isomeric Transition	100.00

128	Stable	-	-

129	Stable	-	-

129_m	8.88 days	Isomeric Transition	100.00

130	Stable	-	-

131	Stable	-	-

131_m	11.934 days	Isomeric Transition	100.00

132	Stable	-	-

133	5.243 days	Beta-minus Decay	100.00

133_m	2.19 days	Isomeric Transition	100.00

134	Stable	-	-

134_m	290 milliseconds	Isomeric Transition	100.00

135	9.14 hours	Beta-minus Decay	100.00

135_m	15.29 minutes	Isomeric Transition	> 99.40

		Beta-minus Decay	< 0.60

136	> 3.6×10⁺²⁰ years	Double Beta-minus Decay	No Data Available

137	3.818 minutes	Beta-minus Decay	100.00

138	14.08 minutes	Beta-minus Decay	100.00

139	39.68 seconds	Beta-minus Decay	100.00

140	13.60 seconds	Beta-minus Decay	100.00

141	1.73 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	0.04

142	1.22 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	0.41

143	0.30 seconds	Beta-minus Decay	100.00

144	1.15 seconds	Beta-minus Decay	100.00

145	900 milliseconds	Beta-minus Decay	100.00

145_m	0.9 seconds	Beta-minus Decay with delayed Neutron Emission	No Data Available

146	No Data Available	Beta-minus Decay	100.00

147	> 150 nanoseconds	Beta-minus Decay	No Data Available

		Beta-minus Decay with delayed Neutron Emission	No Data Available