Ada Hitchins

Ada Florence Remfry Hitchins
Ada Florence Remfry Hitchins
Born	26 June 1891; Tavistock, Devon, England
Died	4 January 1972 (aged 80); Bristol, England
Other names	Mrs. John R. Stephens
Alma mater	University of Glasgow
Awards	Carnegie Scholar (1914–1915)
	Scientific career
Institutions	University of Glasgow; University of Aberdeen; Oxford University; Mining and Geological Department of the Colonial Government of Kenya;

Ada Florence Remfry Hitchins (26 June 1891 – 4 January 1972) was the principal research assistant of British chemist Frederick Soddy, who won the Nobel prize in 1921 for work on radioactive elements and the theory of isotopes. Hitchins isolated samples from uranium ores, taking precise and accurate measurements of atomic mass that provided the first experimental evidence for the existence of different isotopes. She also helped to discover the element protactinium, which Dmitri Mendeleev had predicted should occur in the periodic table between uranium and thorium.

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