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Frederick Soddy


Frederick Soddy

Frederick Soddy
Born (1877-09-02)2 September 1877
Eastbourne, Sussex, England
Died 22 September 1956(1956-09-22) (aged 79)
Brighton, Sussex, England
Nationality British
Alma mater
Academic advisors Ernest Rutherford
Doctoral students Satoyasu Iimori[1]
Known for
Notable awards
Spouse Winifred Beilby

Frederick Soddy FRS[2] (2 September 1877 – 22 September 1956) was an English radiochemist who explained, with Ernest Rutherford, that radioactivity is due to the transmutation of elements, now known to involve nuclear reactions. He also proved the existence of isotopes of certain radioactive elements.[3][4][5][6][7][8][9][10]


  • Biography 1
    • Scientific career 1.1
    • Economics 1.2
    • Descartes' theorem 1.3
  • Honours and awards 2
  • Personal life 3
  • Bibliography 4
  • See also 5
  • References 6
  • External links 7


Soddy was born at 5 Bolton Road, Eastbourne, England. He went to school at Eastbourne College, before going on to study at University College of Wales at Aberystwyth and at Merton College, Oxford, where he graduated in 1898 with first class honors in chemistry.[11] He was a researcher at Oxford from 1898 to 1900.

Scientific career

In 1900 he became a demonstrator in chemistry at McGill University in Montreal, Quebec, where he worked with Ernest Rutherford on radioactivity. He and Rutherford realized that the anomalous behaviour of radioactive elements was because they decayed into other elements. This decay also produced alpha, beta, and gamma radiation. When radioactivity was first discovered, no one was sure what the cause was. It needed careful work by Soddy and Rutherford to prove that atomic transmutation was in fact occurring.

In 1903, with Sir William Ramsay at University College London, Soddy showed that the decay of radium produced helium gas. In the experiment a sample of radium was enclosed in a thin walled glass envelope sited within an evacuated glass bulb. After leaving the experiment running for a long period of time a spectral analysis of the contents of the former evacuated space revealed the presence of helium.[12] Later in 1907, Rutherford and Thomas Royds showed that the helium was first formed as positively charged nuclei of helium (He2+) which were identical to alpha particles, which could pass through the thin glass wall but were contained within the surrounding glass envelope.[13]

From 1904 to 1914, Soddy was a lecturer at the University of Glasgow. In May 1910 Soddy was elected a Fellow of the Royal Society.[2][14] In 1914 he was appointed to a chair at the University of Aberdeen, where he worked on research related to World War I.

The work that Soddy and his research assistant Ada Hitchins did at Glasgow and Aberdeen showed that uranium decays to radium.[15] It also showed that a radioactive element may have more than one atomic mass though the chemical properties are identical.[16] Soddy named this concept isotope meaning 'same place'. The word 'isotope' was initially suggested to him by Margaret Todd. Later, J.J. Thomson showed that non-radioactive elements can also have multiple isotopes.

In 1913, Soddy also showed that an atom moves lower in atomic number by two places on alpha emission, higher by one place on beta emission. This was discovered at about the same time by Kazimierz Fajans, and is known as the radioactive displacement law of Fajans and Soddy, a fundamental step toward understanding the relationships among families of radioactive elements. Soddy published The Interpretation of Radium (1909) and Atomic Transmutation (1953).

In 1919 he moved to the University of Oxford as Dr Lee's Professor of Chemistry, where, in the period up till 1936, he reorganized the laboratories and the syllabus in chemistry. He received the 1921 Nobel Prize in chemistry for his research in radioactive decay and particularly for his formulation of the theory of isotopes.

Satoyasu Iimori who was a japanese chemist from RIKEN learned under Soddy in 1920 - 1921.[17]

His work and essays popularising the new understanding of radioactivity was the main inspiration for H. G. Wells's The World Set Free (1914), which features atomic bombs dropped from biplanes in a war set many years in the future. Wells's novel is also known as The Last War and imagines a peaceful world emerging from the chaos. In Wealth, Virtual Wealth and Debt Soddy praises Wells’s The World Set Free. He also says that radioactive processes probably power the stars.


In four books written from 1921 to 1934, Soddy carried on a "campaign for a radical restructuring of global monetary relationships",[18] offering a perspective on economics rooted in physics—the laws of thermodynamics, in particular—and was "roundly dismissed as a crank".[18] While most of his proposals - "to abandon the gold standard, let international exchange rates float, use federal surpluses and deficits as macroeconomic policy tools that could counter cyclical trends, and establish bureaus of economic statistics (including a consumer price index) in order to facilitate this effort" - are now conventional practice, his critique of fractional-reserve banking still "remains outside the bounds of conventional wisdom".[18] Soddy wrote that financial debts grew exponentially at compound interest but the real economy was based on exhaustible stocks of fossil fuels. Energy obtained from the fossil fuels could not be used again. This criticism of economic growth is echoed by his intellectual heirs in the now emergent field of ecological economics.[18]

Descartes' theorem

He rediscovered the Descartes' theorem in 1936 and published it as a poem, "The Kiss Precise", quoted at Problem of Apollonius. The kissing circles in this problem are sometimes known as Soddy circles.

Honours and awards

He received the Nobel Prize in Chemistry in 1921 and the same year he was elected member of the International Atomic Weights Committee. A small crater on the far side of the Moon as well as the radioactive Uranium mineral Soddyite are named after him; his contributions to his field were significant enough that the IUPAC would likely have named an element for him were it not for the orthographic and phonetic similarity and confusability between "soddium" and "sodium."[19]

Personal life

Soddy married Winifred Beilby, the daughter of Sir Brighton, England in 1956.


  • Radioactivity (1904)
  • The Interpretation of Radium (1909) (a searchable facsimile at the University of Georgia Libraries; DjVu & layered PDF format)
  • Matter and Energy (1911), second edition (2015)
  • The Chemistry of the Radio-elements (1915)
  • Science and life: Aberdeen addresses (1920)
  • Cartesian Economics: The Bearing of Physical Science upon State Stewardship (1921)
  • Science and Life Wealth, Virtual Wealth, and Debt Money versus Man etc (1921)
  • Nobel Lecture - The origins of the conception of isotopes (1922)
  • Wealth, Virtual Wealth and Debt. The solution of the economic paradox (George Allen & Unwin, 1926)
  • The wrecking of a scientific age (1927)
  • The Interpretation of the Atom (1932)
  • Money versus Man (1933)
  • The Role of Money (London: George Routledge & Sons Ltd, 1934) at Internet, second edition (2015)
  • Money as nothing for something ; The gold "standard" snare (1935)
  • Present outlook, a warning : debasement of the currency, deflation and unemployment (1944)
  • The Story of Atomic Energy (1949)
  • Atomic Transmutation (1953)

See also

  • Ada Hitchins, who helped Soddy to discover the element protactinium
  • Alfred J. Lotka
  • Problem of Apollonius
  • Oliver Sacks' autobiography Uncle Tungsten, in which Soddy, his work and his profound discoveries in atomic physics are extensively discussed and explained in Sacks' insightful and easily-understandable language.


  1. ^
  2. ^ a b c
  3. ^
  4. ^
  5. ^
  6. ^
  7. ^ , pp. 163–194
  8. ^
  9. ^
  10. ^
  11. ^
  12. ^ .204 - 20772.Proceedings of the Royal Society of LondonWilliam Ramsay, Frederick Soddy (1903). "Experiments in Radioactivity, and the Production of Helium from Radium".
  13. ^ *.28117.Philosophical MagazineErnest Rutherford, Thomas Royds (1909). "The Nature of the α Particle from Radioactive Substances".
  14. ^
  15. ^
  16. ^
  17. ^ (飯盛里安先生のあゆみを偲んでMasanobu Sakagami, "Memory of the late Professor Satoyasu Iimori )", Chikyu Kagaku, The Geochemical Society of Japan, 16(2), vii - xii, (1982) (in Japanese)
  18. ^ a b c d Eric Zencey: Mr. Soddy’s Ecological Economy. In: The New York Times. April 12, 2009
  19. ^ Soddyite Mineral Data

External links

  • The Central Role of Energy in Soddy's Holistic and Critical Approach to Nuclear Science, Economics, and Social Responsibility
  • Annotated bibliography for Frederick Soddy from the Alsos Digital Library for Nuclear Issues
  • M. King Hubbert on the Nature of Growth. 1974
  • A biography of Frederick Soddy by Arian Forrest Nevin
  • The Frederick Soddy Trust
  • Frederick Soddy Biography (The official web site of the Nobel Foundation)
  • Works by or about Frederick Soddy at Internet Archive
  • "Radioactive change", Rutherford & Soddy article (1903), online and analyzed on Bibnum [click 'à télécharger' for English version].
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