Konstantin Petrzhak

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Konstantin Petrzhak
Константин Антонович Петржак
K. A. Petrzhak (1907–1998)
Born	Konstantin Antonovich Petrzhak (1907-09-04)September 4, 1907 Łuków, Siedlce Governorate, Poland in Russian Empire ((Present-day, Łuków in Poland)
Died	October 10, 1998(1998-10-10) (aged 91) Saint Petersburg, Russia
Nationality	Polish
Citizenship	Russia
Alma mater	Leningrad State University
Known for	Discovery of spontaneous fission Soviet atomic bomb project
Awards	Stalin Prize (1950)
Scientific career
Fields	Physics
Institutions	Khlopin Radium Institute
Thesis	Study of thorium and samarium radioactivity  (1984)

Konstantin Antonovich Petrzhak (alternatively Pietrzak;^[1] Russian: Константи́н Анто́нович Пе́тржак, IPA: [kənstɐnʲˈtʲin ɐnˈtonəvʲɪtɕ ˈpʲedʐək], Polish: [ˈpjɛt.ʂak]; 4 September 1907– 10 October 1998), k.N, was a Russian physicist of Polish origin, and a professor of physics at the Saint Petersburg State University.

Receiving credit with Georgy Flyorov, a physicist, for the discovery of spontaneous fission of uranium in 1940, Petrzhak's career in physics was then spent mostly in the former Soviet program of nuclear weapons.^[2]