Page "Antimony" Paragraph 10
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Antimony exists as two stable isotopes, < sup > 121 </ sup > Sb with a natural abundance of 57. 36 % and < sup > 123 </ sup > Sb with a natural abundance of 42. 64 %.
It also has 35 radioisotopes, of which the longest-lived is < sup > 125 </ sup > Sb with a half-life of 2. 75 years.
In addition, 29 metastable states have been characterized.
The most stable of these is < sup > 124 </ sup > Sb with a half-life of 60. 20 days, which has an application in some neutron sources.
Isotopes that are lighter than the stable < sup > 123 </ sup > Sb tend to decay by β < sup >+</ sup > decay, and those that are heavier tend to decay by β < sup >-</ sup > decay, with some exceptions.
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