Harold C. Urey - American Chemist
(1893-1981)
February 1932
Urey and his coworkers at Columbia University announce the discovery of deuterium, one of the heavy isotopes of hydrogen.

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Naturally occuring hydrogen consists of two isotopes. A third isotope, tritium, was created in 1934. Tritium is radioactive and decays by beta decay with a half life of 12.3 years.

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