Martin David Kamen (August 27, 1913, Toronto – August 31, 2002, Montecito, California) was an American chemist who, together with Sam Ruben, co-discovered the synthesis of the isotope carbon-14 on February 27, 1940, at the University of California Radiation Laboratory, Berkeley. He also confirmed that all of the oxygen released in photosynthesis comes from water, not carbon dioxide, in 1941.
martin david kamen (august 27 1913 toronto – august 31 2002 montecito california) was an american chemist who together with sam ruben co-discovered the synthesis of the isotope carbon-14 on february 27 1940 at the university of california radiation laboratory berkeley he also confirmed that all of the oxygen released in photosynthesis comes from water not carbon dioxide in 1941