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Willard Libby

Willard Libby
Born Willard Frank Libby
(1908-12-17)December 17, 1908
Grand Valley, Colorado
Died September 8, 1980(1980-09-08) (aged 71)
Los Angeles, California
Nationality American
Fields Radioactivity
Alma mater University of California, Berkeley
Thesis Radioactivity of ordinary elements, especially samarium and neodymium: method of detection (1933)
Doctoral advisor Wendell Mitchell Latimer
Doctoral students Maurice Sanford Fox
Frank Sherwood Rowland
Known for Radiocarbon dating
Notable awards

Willard Frank Libby (December 17, 1908 – September 8, 1980) was an American physical chemist noted for his role in the 1949 development of radiocarbon dating, a process which revolutionized archaeology and palaeontology. For his contributions to the team that developed this process, Libby was awarded the Nobel Prize in Chemistry in 1960.

A 1927 chemistry graduate of the University of California at Berkeley, from which he received his doctorate in 1933, he studied radioactive elements and developed sensitive Geiger counters to measure weak natural and artificial radioactivity. During World War II he worked in the Manhattan Project's Substitute Alloy Materials (SAM) Laboratories at Columbia University, developing the gaseous diffusion process for uranium enrichment.

After the war, Libby accepted professorship at the carbon-14. He also discovered that tritium similarly could be used for dating water, and therefore wine. In 1950, he became a member of the General Advisory Committee (GAC) of the Atomic Energy Commission (AEC). He was appointed a commissioner in 1954, becoming its sole scientist. He sided with Edward Teller on pursuing a crash program to develop the hydrogen bomb, participated in the Atoms for Peace program, and defended the administration's atmospheric nuclear testing.

Libby resigned from the AEC in 1959 to become Professor of Chemistry at University of California, Los Angeles (UCLA), a position he held until his retirement in 1976. In 1962, he became the Director of the University of California statewide Institute of Geophysics and Planetary Physics (IGPP). He started the first Environmental Engineering program at UCLA in 1972, and as a member of the California Air Resources Board, he worked to develop and improve California's air pollution standards.


  • Early life and career 1
  • Manhattan Project 2
  • Radiocarbon dating 3
  • Atomic Energy Commission 4
  • UCLA 5
  • Bibliography 6
  • Notes 7
  • References 8
  • External links 9

Early life and career

Willard Frank Libby was born in [1] He had two brothers, Elmer and Raymond, and two sisters, Eva and Evelyn.[2] Libby began his education in a two-room Colorado schoolhouse.[3] When he was five, Libby's parents moved to Santa Rosa, California.[4] He attended Analy High School, near Sebastopol, from which he graduated in 1926.[5] Libby, who grew to be 6 feet 2 inches (188 cm) tall, played tackle on the high school football team.[6]

In 1927 he entered the [9]

Libby was appointed Instructor in the Department of Chemistry at the [9] In 1940, Libby married Leonor Hickey, a physical education teacher.[6] They had twin daughters, Janet Eva and Susan Charlotte, who were born in 1945.[2] He joined Berkeley's chapter of Alpha Chi Sigma in 1941.[11] That year he was awarded a Guggenheim Fellowship,[10] and elected to work at Princeton University.[6]

Manhattan Project

On December 8, 1941, the day after the [1][6] at what became its Substitute Alloy Materials (SAM) Laboratories.[12] During his time in the New York City area, Libby was a resident of Leonia, New Jersey.[13]

Over the next three years, Libby worked on the gaseous diffusion process for uranium enrichment.[4] An atomic bomb required fissile material, and the fissile uranium-235 made up only 0.7 percent of natural uranium. The SAM Laboratories therefore had to find a way of separating kilograms of it from the more abundant uranium-238. Gaseous diffusion worked on the principle that a lighter gas diffuses through a barrier faster than a heavier one at a rate inversely proportional to its molecular weight. But the only known gas containing uranium was the highly corrosive uranium hexafluoride, and a suitable barrier was hard to find.[14]

Through 1942, Libby and his team studied different barriers and the means to protect them from corrosion from the uranium hexafluoride.[15] The most promising type was a barrier made of powdered nickel developed by Edward O. Norris of the Jelliff Manufacturing Corporation and Edward Adler from the City College of New York, which became known as the "Norris-Adler" barrier by late 1942.[16]

In addition to developing a suitable barrier, the SAM Laboratories also had to assist in the design of a gaseous separation plant, which became known as K-25. Libby helped with the engineers from Kellex to produce a workable design for a pilot plant.[17] Libby conducted a series of tests that indicated that the Norris-Adler barrier would work, and he remained confident that with an all-out effort, the remaining problems with it could be solved. Although doubts remained, construction work began on the K-25 full-scale production plant in September 1943.[18]

As 1943 gave way to 1944, many problems remained. Tests began on the machinery at K-25 in April 1944 without a barrier. Attention turned to a new process developed by Kellex. Finally, in July 1944, Kellex barriers began to be installed in K-25.[19] K-25 commenced operation in February 1945, and as cascade after cascade came online, the quality of the product increased. By April 1945, K-25 had attained a 1.1% enrichment.[20] Uranium partially enriched in K-25 was fed into the calutrons at Y-12 to complete the enrichment process.[21]

Construction of the upper stages of the K-25 plant was cancelled, and Kellex was directed to instead design and build a 540-stage side feed unit, which became known as K-27.[22] The last of K-25's 2,892 stages commenced operation in August 1945.[20] On August 5, K-25 starting producing feed enriched to 23 percent uranium-235.[23] K-25 and K-27 achieved their full potential only in the early postwar period, when they eclipsed the other production plants and became the prototypes for a new generation of plants.[20] Enriched uranium was used in the Little Boy bomb employed in the bombing of Hiroshima on August 6, 1945.[24] Libby brought home a stack of newspapers and told his wife, "This is what I've been doing."[6]

Radiocarbon dating

With the war over, Libby accepted an offer from the [1] He returned to his pre-war studies of radioactivity.[4] In 1939, Serge Korff had discovered that cosmic rays generated neutrons in the upper atmosphere. These interact with nitrogen-14 in the air to produce carbon-14: [25]

1n + 14N → 14C + 1p


External links

  • Carey, Charles W. (2006). American scientists. New York: Facts on File.  
  • Greene, Benjamin P. (2007). Eisenhower, Science Advice, and the Nuclear Test-Ban Debate, 1945–1963. Stanford, California: Stanford University Press.  
  • —; Holl, Jack M. (1989). Atoms for Peace and War, Volume III, 1953–1961 Eisenhower and the Atomic Energy Commission. A History of the United States Atomic Energy Commission. University Park, Pennsylvania: Pennsylvania State University Press.  
  • Jones, Vincent (1985). Manhattan: The Army and the Atomic Bomb (PDF). Washington, D.C.: United States Army Center of Military History.  
  • Laylin, James K. (1993). Nobel Laureates in Chemistry, 1901–1992. Washington, D.C.: American Chemical Society.  
  • Magill, Frank N. (1989). The Nobel Prize Winners, Chemistry 1938–1968. Pasadena, California: Salem Press.  


  1. ^ a b c d e "Willard F. Libby – Biographical". Nobel Foundation. Retrieved December 7, 2014. 
  2. ^ a b c "Willard F. Libby". Sylent Communications. Retrieved 26 July 2015. 
  3. ^ a b Magill 1989, pp. 703–712.
  4. ^ a b c d e Carey 2006, pp. 231–232.
  5. ^ a b "Willard F. Libby mural at Analy High School and a close up of the plaque that can be seen at Libby's left shoulder, May 6, 1984". Retrieved July 22, 2015. 
  6. ^ a b c d e f g "Science: The Philosophers' Stone".  
  7. ^ Libby, Willard F. (1933). "Radioactivity of ordinary elements, especially samarium and neodymium: method of detection". University of California, Berkeley. Retrieved July 22, 2015. 
  8. ^ a b c d e "University of California: In Memoriam, 1980 – Willard Frank Libby, Chemistry: Berkeley and Los Angeles". University of California. Retrieved July 22, 2015. 
  9. ^ a b c d e Seaborg 1981, pp. 92–95.
  10. ^ a b "Willard F. Libby". John Simon Guggenheim Foundation. Retrieved July 28, 2015. 
  11. ^ "Alpha Chi Sigma". Sigma Chapter. Retrieved July 22, 2015. 
  12. ^ Hewlett & Anderson 1962, p. 128.
  13. ^ "Well-Read, Well-Shaded and Well-Placed".  
  14. ^ Hewlett & Anderson 1962, pp. 29–31.
  15. ^ Hewlett & Anderson 1962, pp. 99–100.
  16. ^ Hewlett & Anderson 1962, pp. 101, 126.
  17. ^ Hewlett & Anderson 1962, pp. 121–124.
  18. ^ Hewlett & Anderson 1962, pp. 130–134.
  19. ^ Hewlett & Anderson 1962, pp. 137–141.
  20. ^ a b c Jones 1985, pp. 167–171.
  21. ^ Hewlett & Anderson 1962, pp. 159–160.
  22. ^ Jones 1985, pp. 158–165.
  23. ^ Jones 1985, p. 148.
  24. ^ Hewlett & Anderson 1962, pp. 401–403.
  25. ^ a b c Libby, Willard (December 12, 1960). "Radiocarbon Dating – Nobel Lecture" (PDF). Retrieved July 28, 2015. 
  26. ^ Godwin, H (1962). "Half-life of radiocarbon". Nature 195 (4845): 984.  
  27. ^ W.F. Libby (1946). "Atmospheric Helium Three and Radiocarbon from Cosmic Radiation". Physical Review 69 (11–12): 671–672.  
  28. ^ "The Nobel Prize in Chemistry 1960". Nobel Foundation. Retrieved July 27, 2015. 
  29. ^ Hewlett & Holl 1989, p. 446.
  30. ^ Hewlett & Holl 1989, pp. 278–279.
  31. ^ Greene 2007, p. 65.
  32. ^ Buck, Alice (July 1983). "The Atomic Energy Commission" (PDF).  
  33. ^ Hewlett & Holl 1989, pp. 542–543.
  34. ^ Folkart, Burt A. (November 13, 1986). "Leona Marshall Libby Dies; Sole Woman to Work on Fermi's 1st Nuclear Reactor". Retrieved April 16, 2013. 
  35. ^ a b Well, Martin (September 10, 1980). "Willard Libby Dies, Noted For Carbon-14 Research".  
  36. ^ "To Award Chandler Medal Tomorrow To Chicago Chemist".  
  37. ^ a b Laylin 1993, pp. 419–420.
  38. ^ "Gold Medal Award Winners:". AIC. Retrieved 17 January 2015. 
  39. ^ "City Parks". City of  
  40. ^ "Finding Aid for the Willard F. Libby Papers". Retrieved July 28, 2015. 
  41. ^ Libby 1981.



Libby died at the UCLA Medical Center in Los Angeles on September 8, 1980, from a blood clot in his lung complicated by pneumonia.[35] His papers are in the Charles E. Young Research Library at the UCLA.[40] Seven volumes of his papers were edited by Leona and Rainer Berger and published in 1981.[41]

Although Libby retired and became a professor emeritus in 1976,[8] he remained professionally active as a member of the National Academy of Sciences, American Academy of Arts and Sciences, and the American Philosophical Society, until his death in 1980.[3] In addition to the Nobel Prize, he received numerous honours and awards, including Columbia University's Chandler Medal in 1954,[36] the Remsen Memorial Lecture Award in 1955, the Bicentennial Lecture Award from the City College of New York and the Nuclear Applications in Chemistry Award in 1956, the Franklin Institute's Elliott Cresson Medal in 1957, the American Chemical Society's Willard Gibbs Award in 1958, the Priestley Medal from Dickinson College and the Albert Einstein Medal in 1959, the Geological Society of America's Arthur L. Day Medal in 1961,[37] the Gold Medal of the American Institute of Chemists in 1970,[38] and the Lehman Award from the New York Academy of Sciences in 1971. He was elected a member of the National Academy of Sciences in 1950.[37] Analy High School library has a mural of Libby,[5] and a Sebastopol city park and a nearby highway are named in his honor.[39]

Libby resigned from the AEC in 1959, he became Professor of Chemistry at [9] He established a research program to investigate heterogeneous catalysis with the idea of reducing emissions from motor vehicles through more complete fuel combustion.[8] The election of Richard Nixon as president in 1968 generated speculation that Libby might be appointed as Presidential Science Advisor. There was a storm of protest from scientists who felt that Libby was too conservative, and the offer was not made.[35]


As the only scientist among the five AEC commissioners, it fell to Libby to defend the Eisenhower administration's stance on atmospheric [9][31] In January 1956, he publicly revealed the existence of Project Sunshine, a series of research studies to ascertain the impact of radioactive fallout on the world's population that he had initiated in 1953 while serving on the GAC.[32] By 1958, even Libby and Teller were supporting limits on atmospheric nuclear testing.[33]

[9] and was part of the United States delegation at the Geneva Conferences on Peaceful Uses of Atomic Energy in 1955 and 1958.[6][29]

Atomic Energy Commission

[25] similarly could be used for dating water, and therefore wine.tritium He also discovered that [28] "for his method to use carbon-14 for age determination in archaeology, geology, geophysics, and other branches of science".Nobel Prize in Chemistry In 1960, he was awarded the [4] and other disciplines that dealt with ancient artefacts.palaeontology, archaeology to be reliable and accurate. The technique revolutionised radiocarbon dating with known dates from their tree rings showed sequoia in 1955. He also developed sensitive radiation detectors that could use the technique. Tests against Radiocarbon Dating and expanded on it in his monograph [27] He published his theory in 1946,[25]

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