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Iodine-131

Medication
Iodine-131 is an important radioisotope of iodine discovered by Glenn Seaborg and John Livingood in 1938 at the University of California, Berkeley. It has a radioactive decay half-life of about eight days. It is associated with nuclear energy,... Wikipedia
Neutrons: 78
Excess energy: 971 keV
Half-life (t1/2): 8.0197 days
Isotope mass: 130.9061246(12) Da
Symbol: 131I