It's Elemental - Isotopes of the Element Iodine

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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 Iodine with a Known Natural Abundance

Mass Number	Natural Abundance	Half-life

127	100%	Stable

All Known Isotopes of the Element Iodine

Mass Number	Half-life	Decay Mode	Branching Percentage

108	36 milliseconds	Alpha Decay	91.00

		Electron Capture	9.00

		Proton Emission	< 1.00

109	103 microseconds	Proton Emission	100.00

110	0.65 seconds	Electron Capture	83.00

		Alpha Decay	17.00

		Electron Capture with delayed Proton Emission	11.00

		Electron Capture with delayed Alpha Decay	1.10

111	2.5 seconds	Electron Capture	99.90

		Alpha Decay	~ 0.10

112	3.42 seconds	Electron Capture	100.00

		Alpha Decay	~ 1.2E-3

113	6.6 seconds	Electron Capture	100.00

		Alpha Decay	3.3E-7

114	2.1 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	No Data Available

114_m	6.2 seconds	Electron Capture	<= 100.00

		Isomeric Transition	<= 100.00

115	1.3 minutes	Electron Capture	100.00

116	2.91 seconds	Electron Capture	100.00

117	2.22 minutes	Electron Capture	100.00

		Electron Capture	~ 77.00

118	13.7 minutes	Electron Capture	100.00

118_m	8.5 minutes	Electron Capture	< 100.00

		Isomeric Transition	> 0.00

119	19.1 minutes	Electron Capture	100.00

		Electron Capture	51.00

		Electron Capture	49.00

120	81.0 minutes	Electron Capture	100.00

120_m	53 minutes	Electron Capture	100.00

121	2.12 hours	Electron Capture	100.00

122	3.63 minutes	Electron Capture	100.00

123	13.27 hours	Electron Capture	100.00

124	4.1760 days	Electron Capture	100.00

125	59.400 days	Electron Capture	100.00

126	13.11 days	Electron Capture	56.30

		Beta-minus Decay	43.70

127	Stable	-	-

128	24.99 minutes	Beta-minus Decay	93.10

		Electron Capture	6.90

129	1.57×10⁺⁷ years	Beta-minus Decay	100.00

130	12.36 hours	Beta-minus Decay	100.00

130_m	8.84 minutes	Isomeric Transition	84.00

		Beta-minus Decay	16.00

131	8.02070 days	Beta-minus Decay	100.00

132	2.295 hours	Beta-minus Decay	100.00

132_m	1.387 hours	Isomeric Transition	86.00

		Beta-minus Decay	14.00

133	20.8 hours	Beta-minus Decay	100.00

133_m	9 seconds	Isomeric Transition	100.00

134	52.5 minutes	Beta-minus Decay	100.00

134_m	3.60 minutes	Isomeric Transition	97.70

		Beta-minus Decay	2.30

135	6.57 hours	Beta-minus Decay	100.00

136	83.4 seconds	Beta-minus Decay	100.00

136_m	46.9 seconds	Beta-minus Decay	100.00

137	24.5 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	6.97

138	6.49 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	5.50

139	2.280 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	10.00

140	0.86 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	9.30

141	0.43 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	21.20

142	≈ 0.2 seconds	Beta-minus Decay	100.00

143	> 150 nanoseconds	Beta-minus Decay	No Data Available

144	> 300 nanoseconds	Beta-minus Decay	No Data Available