Arthur Jeffrey Dempster

Did you know Arthur Jeffrey Dempster a Canadian American physicist best known for his work in mass spectrometry and his discovery in 1935 of the uranium isotope 235U was born 134 years ago on August 14 1886?

Dempster was born in Toronto Ontario Canada he received his bachelor’s and master’s degrees at the University of Toronto in 1909 and 1910 respectively he travelled to study in Germany and then left at the outset of World War one for the United States there he received his PhD in physics at the University of Chicago

Dempster joined the physics faculty at the University of Chicago in 1916 and remained there until his death in 1950 during World War II he worked on the secret Manhattan Project to develop the world’s first nuclear weapons.

From 1943 to 1946 Dempster was chief physicist of the University of Chicago’s Metallurgical Laboratory or med lab which integrally related to the Manhattan Project and founded to study the materials necessary for the manufacture of atomic bombs in 1946.

In 1946, he took a position as a division director at the Argonne National Laboratory.

Dempster died on March 11th 1950 in Stuart, Florida at the age of 63.

Dempster developed the first modern mass spectrometer a scientific apparatus allowing physicists to identify compounds by the mass of elements in a sample and determine the isotopic composition of elements in a sample.

Dempster’s mass spectrometer was over 100 times more accurate than previous versions and established the basic theory and design of mass spectrometers that is still used to this day.

Dempster’s research over his career centered on the mass spectrometer in its applications leading in 1935 to his discovery of the uranium isotope 235u this isotopes ability to cause a rapidly expanding fish and nuclear chain reaction allowed the development of the atom bomb.

In nuclear power dempster was also well known as an authority on positive rays topic references

In 1918, Dempster developed the first modern mass spectrometer, a scientific apparatus
allowing physicists to identify compounds by the mass of elements in a sample and determine
the isotopic composition of elements in a sample.

Dempster’s mass spectrometer was over 100 times more accurate than previous versions and established the basic theory and design of mass spectrometers that is still used to this day. Dempster’s research over his career centered on the mass spectrometer and its applications, leading in 1935 to his discovery of the uranium isotope 235U.

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