Frisch-Peierls memorandum

Frisch-Peierls memorandum

The Frisch-Peierls memorandum was written by Otto Frisch and Rudolf Peierls while they were both working at Birmingham University, England and given to Marcus Oliphant. Oliphant passed the document on to Henry Tizard, chairman of the Committee on the Scientific Survey of Air Defence who, as a result, requested the setting-up of what was to become the secret MAUD Committee. The memorandum (a copy of which is held in the Public Record Office at Kew) is dated March 1940. The memorandum contained new calculations about the size of the critical mass needed for an atomic bomb, and helped accelerate U.S. and British efforts towards bomb development during World War II.

The two men were the first to calculate that an atomic bomb would require about 1 lb of the isotope uranium-235. Before it had been assumed that the bomb itself would require many tons of uranium, implying that it was theoretically possible, but not a practical military device. An earlier letter to President Franklin D. Roosevelt, signed by Albert Einstein (but written by Leo Szilard), had suggested it may need to be delivered by ship but could not be small enough to drop from the air.

The memo was written in two parts. The second was an explanation of the science supporting their conclusions. The first was an elegant and comprehensive outline of the implications of their calculations. It included a proposal that the best defence against such a weapon would be to develop one before Germany did so. In a few short pages these two scientists had anticipated the policies of deterrence which would later shape Cold War geopolitics.

The memorandum opens with:

"Strictly Confidential

"Memorandum on the properties of a radioactive “super-bomb”

" The attached detailed report concerns the possibility of constructing a “super-bomb” which utilizes the energy stored in atomic nuclei as a source of energy. The energy liberated in the explosion of such a super-bomb is about the same as that produced by the explosion of 1000 tons of dynamite. This energy is liberated in a small volume, in which it will, for an instant, produce a temperature comparable to that in the interior of the sun. The blast from such an explosion would destroy life in a wide area. The size of this area is difficult to estimate, but it will probably cover the centre of a big city."

" In addition, some part of the energy set free by the bomb goes to produce radioactive substances, and these will emit very powerful and dangerous radiations. The effect of these radiations is greatest immediately after the explosion, but it decays only gradually and even for days after the explosion any person entering the affected area will be killed."

" Some of this radioactivity will be carried along with the wind and will spread the contamination; several miles downwind this may kill people."

The memorandum helped galvanize both Britain and America down a path which lead to a report by the British MAUD Committee, the Tube Alloys project, the Manhattan Project, and ultimately the atomic bombings of Hiroshima and Nagasaki.

ee also

*Einstein-Szilárd letter
*Timeline of the Manhattan Project

References

*World Nuclear Association - [http://www.world-nuclear.org/info/inf54.html Outline History of Nuclear Energy]

External links

*Stanford University - [http://www.stanford.edu/class/history5n/FPmemo.pdf Frisch-Peierls memorandum (US spelling)] (PDF)
* [http://www.atomicarchive.com/Docs/Begin/FrischPeierls.shtml Frisch and Peierls's second memorandum]


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  • Frisch-Peierls-Memorandum — Das Frisch Peierls Memorandum war eine von den Physikern Otto Frisch und Rudolf Peierls im März 1940 in Birmingham abgefasste Denkschrift über die Möglichkeit des Baus einer Super Bombe durch Ausnutzung der bei Kernspaltung freiwerdenden Energie …   Deutsch Wikipedia

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  • Frisch — ist der Name folgender Personen: Anton Frisch (ÖVP) (1889–1963), österreichischer Politiker (ÖVP), Nationalrat und Bundesrat Anton Frisch (Radsportler) ( 1929–1962), österreichischer Querfeldein Radsportler Anton Frisch (FPÖ) (* 1954),… …   Deutsch Wikipedia

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  • Peierls — Sir Rudolph Ernst Peierls (* 5. Juni 1907 in Berlin; † 19. September 1995 in Oxford) war ein deutsch britischer Physiker. Inhaltsverzeichnis 1 Leben und Werk 2 Ehrungen 3 Schriften …   Deutsch Wikipedia

  • Rudolf Peierls — Infobox Scientist box width = 300px name = Rudolf Peierls image size = 200px caption = Sir Rudolf Ernst Peierls (1907 1995) birth date = June 5 1907, Berlin birth place = Berlin, Germany death date = September 19, 1995 death place = Oxford,UK… …   Wikipedia

  • Otto Robert Frisch — s wartime Los Alamos ID badge photo. Born 1 October 1904 Vienna, Austria …   Wikipedia

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