‘Perhaps the most important isotope’: how carbon-14 revolutionised science

The discovery that carbon atoms act as a marker of time of death transformed everything from biochemistry to oceanography - but the breakthrough nearly didn't happen

Martin Kamen had worked for three days and three nights without sleep. The US chemist was finishing off a project in which he and a colleague, Sam Ruben, had bombarded a piece of graphite with subatomic particles. The aim of their work was to create new forms of carbon, ones that might have practical uses.

Exhausted, Kamen staggered out of his laboratory at Berkeley in California, having finished off the project in the early hours of 27 February 1940. He desperately needed a break. Rumpled, red eyed and with a three-day growth of beard, he looked a mess.

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