Biography of Arthur Jeffrey Dempster (1886-1950) - Arthur Jeffrey Dempster is a U.S. physicist, doctor, professor, fermentation inventor of the mass spectrometer (1918), uranium 235, and many stable isotopes. He was born in Toronto, Canada, on August 14, 1886 and died in Stuart, Florida, USA, on March 11, 1950 at the age of 64 years. After graduating from the University of Toronto (1910), he went to Germany to deepen his knowledge. When World War I broke out (1914) he moved to America and enter a U.S. citizen (1918). He received a doctorate (1916) from the University of Chicago and became a teacher of physics (1919) at the University until his death (1950).
The mass spectrometer is an instrument for measuring the quantity of a variety of nuclei of atoms in a material. This tool is useful to analyze the chemical fermentation composition and to determine the manifold isotopes of an element. In 1936 with Kenneth T.Bainbridge, U.S. physicist and JHE Mattauch, Austrian physicist, Dempster made a double focusing mass spectrograph to measure the mass of an atomic fermentation nucleus. He was always trying to improve the quality of the mass spectrograph. With a spectrograph that has been repaired, it can analyze materials that can not be obtained in the form of gas more quickly. Most people find isotopes is Francis William Aston, British physicist. But strangely Aston could not find the isotope fermentation uranium-235, the main fuel for atomic bombs. Uranium-235 is also used as fuel in nuclear reactors to generate fermentation atomic power.
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