Willard Libby
Developed radiocarbon dating, revolutionizing archaeology and palaeontology.
Willard Frank Libby was an American physical chemist born on December 17, 1908, in Parachute, Colorado, to farming parents. He began his education in a two-room schoolhouse and later moved to Santa Rosa, California, graduating from Analy High School in 1926. He earned his bachelor’s degree in 1931 and his doctorate in 1933 from the University of California, Berkeley, where his doctoral research under Wendell Mitchell Latimer focused on the radioactivity of ordinary elements, particularly samarium and neodymium. Independently, he discovered that natural long-lived samarium isotopes primarily decay by emitting alpha particles. Libby became an instructor at Berkeley in 1933 and an assistant professor in 1938, spending the 1930s building sensitive Geiger counters to measure weak natural and artificial radioactivity. He joined the Alpha Chi Sigma fraternity in 1941 and was awarded a Guggenheim Fellowship to work at Princeton University.
During World War II, Libby volunteered for the Manhattan Project and joined Harold Urey at Columbia University’s Substitute Alloy Materials Laboratories. He worked on the gaseous diffusion process for uranium enrichment, studying barriers to handle corrosive uranium hexafluoride. He tested the Norris-Adler barrier made of powdered nickel and assisted in designing the K-25 pilot plant, which began full-scale production in 1945.
After the war, Libby became a professor at the University of Chicago’s Institute for Nuclear Studies, where he developed radiocarbon dating using carbon-14, a breakthrough for archaeology and paleontology. He also discovered that tritium could date water and wine. He served on the Atomic Energy Commission’s General Advisory Committee from 1950, became a commissioner in 1954, and supported Edward Teller’s push for the hydrogen bomb, participated in Atoms for Peace, and defended atmospheric nuclear testing. He resigned in 1959 to join UCLA, where he remained until 1976, also directing the Institute of Geophysics and Planetary Physics from 1962. He founded UCLA’s first Environmental Engineering program in 1972 and worked on California’s air pollution standards as a board member. Libby received the Nobel Prize in Chemistry in 1960 for radiocarbon dating. He died on September 8, 1980.
- field
- Physical chemistry
- nationality
- American
- known_for
- Development of radiocarbon dating
Lore & Background
During the 1930s, he built sensitive Geiger counters to measure weak natural and artificial radioactivity, and independently discovered that natural long-lived isotopes of samarium decay by alpha particle emission. After the war, he accepted a professorship at the University of Chicago's Institute for Nuclear Studies, where he developed the technique for dating organic compounds using carbon-14. He also discovered that tritium could be used for dating water and wine.
Reader's Guide
His work built on earlier discoveries about cosmic rays and carbon-14, and he created sensitive radiation detectors to make the technique practical. The method's reliability was confirmed by tests against sequoia tree rings with known dates. Libby’s development of radiocarbon dating emerged from his long-standing study of radioactive elements and weak natural radioactivity, for which he had built sensitive Geiger counters during the 1930s. This technique, announced in 1949, allowed scientists to determine the age of organic materials by measuring their remaining carbon-14, a radioactive isotope formed in the atmosphere by cosmic rays. The process revolutionized archaeology and palaeontology by providing a reliable chronological tool for artifacts and fossils previously datable only by relative methods. Libby also discovered that tritium could be used similarly to date water, including wine. Beyond his laboratory work, his significance extended into public policy: he served on the Atomic Energy Commission, where he was the sole scientist among its commissioners, and he defended atmospheric nuclear testing while participating in the Atoms for Peace program. Later, at UCLA, he directed the Institute of Geophysics and Planetary Physics and helped establish California’s first Environmental Engineering program, working on air pollution standards as a member of the California Air Resources Board.
Did You Know?
- Libby discovered that tritium could be used for dating water and wine.
- He played tackle on his high school football team and grew to be 6 feet 2 inches tall.
- During the Manhattan Project, he worked on the gaseous diffusion process for uranium enrichment at Columbia University.
More in Chemists And Biochemists 1-24
Spotted an error? Know more?
This is a living reference — every entry is fact-audited, and reader corrections feed straight into our audit queue. Suggest an edit · See this site's audit record