It's Elemental - Isotopes of the Element Tellurium

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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 Tellurium with a Known Natural Abundance

Mass Number	Natural Abundance	Half-life

120	0.09%	Stable

122	2.55%	Stable

123	0.89%	> 6×10⁺¹⁴ years

124	4.74%	Stable

125	7.07%	Stable

126	18.84%	Stable

128	31.74%	7.7×10⁺²⁴ years

130	34.08%	> 0.79×10⁺²¹ years

All Known Isotopes of the Element Tellurium

Mass Number	Half-life	Decay Mode	Branching Percentage

106	60 microseconds	Alpha Decay	100.00

107	3.1 milliseconds	Alpha Decay	70.00

		Electron Capture	30.00

108	2.1 seconds	Electron Capture	51.00

		Alpha Decay	49.00

		Electron Capture with delayed Proton Emission	2.40

109	4.6 seconds	Electron Capture	96.10

		Electron Capture with delayed Proton Emission	9.40

		Alpha Decay	3.90

		Electron Capture with delayed Alpha Decay	< 5.0E-3

110	18.6 seconds	Electron Capture	~ 100.00

		Alpha Decay	~ 3.0E-3

111	19.3 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	No Data Available

112	2.0 minutes	Electron Capture	100.00

113	1.7 minutes	Electron Capture	100.00

114	15.2 minutes	Electron Capture	100.00

115	5.8 minutes	Electron Capture	100.00

115_m	6.7 minutes	Electron Capture	<= 100.00

		Isomeric Transition	No Data Available

116	2.49 hours	Electron Capture	100.00

117	62 minutes	Electron Capture	100.00

		Electron Capture	25.00

117_m	103 milliseconds	Isomeric Transition	100.00

118	6.00 days	Electron Capture	100.00

119	16.05 hours	Electron Capture	100.00

		Electron Capture	2.06

119_m	4.70 days	Electron Capture	100.00

		Electron Capture	0.41

		Isomeric Transition	< 8.0E-3

120	Stable	-	-

121	19.16 days	Electron Capture	100.00

121_m	154 days	Isomeric Transition	88.60

		Electron Capture	11.40

122	Stable	-	-

123	> 6×10⁺¹⁴ years	Electron Capture	100.00

123_m	119.25 days	Isomeric Transition	100.00

124	Stable	-	-

125	Stable	-	-

125_m	57.40 days	Isomeric Transition	100.00

126	Stable	-	-

127	9.35 hours	Beta-minus Decay	100.00

127_m	109 days	Isomeric Transition	97.60

		Beta-minus Decay	2.40

128	7.7×10⁺²⁴ years	Double Beta-minus Decay	100.00

129	69.6 minutes	Beta-minus Decay	100.00

129_m	33.6 days	Isomeric Transition	63.00

		Beta-minus Decay	37.00

130	> 0.79×10⁺²¹ years	Double Beta-minus Decay	100.00

131	25.0 minutes	Beta-minus Decay	100.00

131_m	30 hours	Beta-minus Decay	77.80

		Isomeric Transition	22.20

132	3.204 days	Beta-minus Decay	100.00

133	12.5 minutes	Beta-minus Decay	100.00

133_m	55.4 minutes	Beta-minus Decay	82.50

		Isomeric Transition	17.50

134	41.8 minutes	Beta-minus Decay	100.00

135	19.0 seconds	Beta-minus Decay	100.00

135_m	0.51 microseconds	Isomeric Transition	100.00

136	17.63 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	1.31

137	2.49 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	2.69

138	1.4 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	6.30

139	> 150 nanoseconds	Beta-minus Decay	No Data Available

		Beta-minus Decay with delayed Neutron Emission	No Data Available

140	> 150 nanoseconds	Beta-minus Decay	No Data Available

		Beta-minus Decay with delayed Neutron Emission	No Data Available

141	> 150 nanoseconds	Beta-minus Decay	No Data Available

		Beta-minus Decay with delayed Neutron Emission	No Data Available

142	No Data Available	No Data Available	No Data Available