It's Elemental - Isotopes of the Element Antimony

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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 Antimony with a Known Natural Abundance

Mass Number	Natural Abundance	Half-life

121	57.21%	Stable

123	42.79%	Stable

All Known Isotopes of the Element Antimony

Mass Number	Half-life	Decay Mode	Branching Percentage

103	> 1.5 microseconds	Electron Capture	No Data Available

104	0.44 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	< 7.00

		Proton Emission	< 1.00

105	1.12 seconds	Electron Capture	~ 99.00

		Proton Emission	~ 1.00

106	0.6 seconds	Electron Capture	No Data Available

107	4.6 seconds	Electron Capture	100.00

108	7.4 seconds	Electron Capture	100.00

109	17.0 seconds	Electron Capture	100.00

110	23.0 seconds	Electron Capture	100.00

111	75 seconds	Electron Capture	100.00

112	51.4 seconds	Electron Capture	100.00

113	6.67 minutes	Electron Capture	100.00

114	3.49 minutes	Electron Capture	100.00

115	32.1 minutes	Electron Capture	100.00

116	15.8 minutes	Electron Capture	100.00

116_m	60.3 minutes	Electron Capture	100.00

117	2.80 hours	Electron Capture	100.00

		Electron Capture	1.70

117_m	355 microseconds	Isomeric Transition	100.00

118	3.6 minutes	Electron Capture	100.00

118_m	5.00 hours	Electron Capture	100.00

119	38.19 hours	Electron Capture	100.00

119_m	0.85 seconds	Isomeric Transition	100.00

120	15.89 minutes	Electron Capture	100.00

120_m	5.76 days	Electron Capture	100.00

121	Stable	-	-

122	2.7238 days	Beta-minus Decay	97.59

		Electron Capture	2.41

122_m	4.191 minutes	Isomeric Transition	100.00

123	Stable	-	-

124	60.20 days	Beta-minus Decay	100.00

124_m	93 seconds	Isomeric Transition	75.00

		Beta-minus Decay	25.00

124_m2	20.2 minutes	Isomeric Transition	100.00

125	2.75856 years	Beta-minus Decay	100.00

126	12.46 days	Beta-minus Decay	100.00

126_m	19.15 minutes	Beta-minus Decay	86.00

		Isomeric Transition	14.00

126_m2	≈ 11 seconds	Isomeric Transition	100.00

127	3.85 days	Beta-minus Decay	100.00

128	9.01 hours	Beta-minus Decay	100.00

128_m	10.4 minutes	Beta-minus Decay	96.40

		Isomeric Transition	3.60

129	4.40 hours	Beta-minus Decay	100.00

129_m	17.7 minutes	Beta-minus Decay	85.00

		Isomeric Transition	15.00

130	39.5 minutes	Beta-minus Decay	100.00

130_m	6.3 minutes	Beta-minus Decay	100.00

131	23.03 minutes	Beta-minus Decay	100.00

132	2.79 minutes	Beta-minus Decay	100.00

132_m	4.10 minutes	Beta-minus Decay	100.00

133	2.5 minutes	Beta-minus Decay	100.00

134	0.78 seconds	Beta-minus Decay	100.00

134_m	10.22 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	0.091

135	1.68 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	22.00

136	0.923 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	16.30

136_m	0.57 microseconds	Isomeric Transition	100.00

137	> 150 nanoseconds	Beta-minus Decay	No Data Available

		Beta-minus Decay with delayed Neutron Emission	No Data Available

138	> 150 nanoseconds	Beta-minus Decay	No Data Available

		Beta-minus Decay with delayed Neutron Emission	No Data Available

139	> 150 nanoseconds	No Data Available	No Data Available