Arthur Jeffrey Dempster

Arthur Jeffrey Dempster
Dempster, c. 1925-30
Born	August 14, 1886 Toronto, Ontario, Canada
Died	March 11, 1950(1950-03-11) (aged 63) Stuart, Florida, U.S.
Nationality	Canadian-American
Alma mater	B.S. University of Toronto M.S. University of Toronto Ph.D. University of Chicago
Known for	Developed the first modern mass spectrometer, discovered 235U (used in atomic bombs)
Awards	Newcomb Cleveland Prize (1929)
Scientific career
Fields	Physics

External videos
Michael A. Grayson, Discovery of Isotopes of Elements (Part I: Arthur Jeffrey Dempster), Profiles in Chemistry, Chemical Heritage Foundation

Arthur Jeffrey Dempster (August 14, 1886 – March 11, 1950) was a Canadian-American physicist best known for his work in mass spectrometry and his discovery in 1935 of the uranium isotope ²³⁵U.^[1]