Joseph Rotblat

Sir Joseph Rotblat

Josef Rotblat ID badge.png
Los Alamos badge photograph, 1944
Józef Rotblat

(1908-11-04)4 November 1908
Warsaw, Poland
Died31 August 2005(2005-08-31) (aged 96)
London, United Kingdom
Cause of deathSepticaemia
Alma mater
Known for
Spouse(s)Tola Gryn
Scientific career
Determination of a number of neutrons emitted from a source (1950)

Sir Joseph Rotblat KCMG CBE FRS (4 November 1908 – 31 August 2005) was a Polish physicist, a self-described "Pole with a British passport".[2] Rotblat worked on Tube Alloys and the Manhattan Project during World War II, but left the Los Alamos Laboratory after the war with Germany ended. His work on nuclear fallout was a major contribution toward the ratification of the 1963 Partial Nuclear Test Ban Treaty. A signatory of the 1955 Russell–Einstein Manifesto, he was secretary-general of the Pugwash Conferences on Science and World Affairs from their founding until 1973 and shared, with the Pugwash Conferences, the 1995 Nobel Peace Prize "for efforts to diminish the part played by nuclear arms in international affairs and, in the longer run, to eliminate such arms."[3]

Early life and education

Józef Rotblat was born on 4 November 1908, to a Polish-Jewish family in Warsaw,[4] in what was then Russian Poland.[5] He was one of seven children, two of whom died in infancy.[6] His father, Zygmunt Rotblat, built up and ran a nationwide horse-drawn carriage business, owned land and bred horses. Józef's early years were spent in what was a prosperous household but circumstances changed at the outbreak of World War I. Borders were closed and the family's horses were requisitioned, leading to the failure of the business and poverty for their family.[5] Despite having a religious background, by the age of ten, he doubted the existence of God,[7] and later became an agnostic.[8][9]

Rotblat's parents could not afford to send him to a gymnasium, so Rotblat received his secondary education in a heder taught by a local rabbi. He then attended a technical school, where he studied electrical engineering, graduating with his diploma in 1923. After graduating, Rotblat worked as a electrician in Warsaw, but had an ambition to become a physicist.[6] He sat the entrance examinations of the Free University of Poland in January 1929, and passed the physics one with ease, but was less successful in writing a paper about the Commission of National Education, a subject about which he knew nothing. He was then interviewed by Ludwik Wertenstein [pl], the Dean of the Science Faculty. Wertenstein had studied in Paris under Marie Curie and at the Cavendish Laboratory at the University of Cambridge under Ernest Rutherford. Wertenstein offered Rotblat a place.[10]

Rotblat earned a Master of Arts at the Free University in 1932. After, he entered the University of Warsaw, and became a Doctor of Physics in 1938. He held the position of Research Fellow in the Radiological Laboratory of the Scientific Society of Warsaw, of which Wertenstein was the director, and became assistant Director of the Atomic Physics Institute of the Free University of Poland in 1938.[11] During this period, Rotblat married a literature student, Tola Gryn, whom he had met at a student summer camp in 1930.[4][12]

Before the outbreak of World War II, he conducted experiments which showed that in the fission process, neutrons were emitted.[13] In early 1939, he envisaged that a large number of fissions could occur and if this happened within a sufficiently short time, then considerable amounts of energy could be released. He went on to calculate that this process could occur in less than a microsecond, and as a consequence would result in an explosion.[14][15]

In 1939, through Wertenstein's connections, Rotblat was invited to study in Paris and at the University of Liverpool under James Chadwick, winner of the 1932 Nobel Prize for discovering the neutron. Chadwick was building a particle accelerator called a "cyclotron" to study fundamental nuclear reactions, and Rotblat wanted to build a similar machine in Warsaw, so he decided to join Chadwick in Liverpool. He travelled to England alone because he could not afford to support his wife there.[16]

Before long, Chadwick gave Rotblat a fellowship (the Oliver Lodge Fellowship), doubling his income, and in that summer of 1939, the young Pole returned home, intending to bring Tola back with him.[17] When the time came to leave Warsaw in late August, however, she was ill following an operation for appendicitis, and remained behind, expecting to follow within days; however, the outbreak of war brought calamity.[18] Tola was trapped, and desperate efforts in the ensuing months to bring her out through Denmark (with the help of Niels Bohr), Belgium, and finally Italy came to nothing, as each country in turn was closed off by the war.[19] He never saw her again; she died in the Holocaust at the Belzec concentration camp.[20] This affected him deeply for the rest of his life, and he never remarried.[21]

Other Languages
العربية: جوزيف روتبلت
беларуская: Джозеф Ротблат
беларуская (тарашкевіца)‎: Джозэф Ротблат
български: Юзеф Ротблат
čeština: Józef Rotblat
español: Józef Rotblat
Esperanto: Józef Rotblat
français: Józef Rotblat
hrvatski: Józef Rotblat
Bahasa Indonesia: Sir Józef Rotblat
italiano: Józef Rotblat
Basa Jawa: Joseph Rotblat
Kreyòl ayisyen: Józef Rotblat
Bahasa Melayu: Joseph Rotblat
Nederlands: Józef Rotblat
português: Józef Rotblat
română: Joseph Rotblat
Runa Simi: Joseph Rotblat
slovenčina: Józef Rotblat
slovenščina: Joseph Rotblat
Türkçe: Joseph Rotblat
українська: Юзеф Ротблат
Yorùbá: Józef Rotblat