Skip to main content Skip to Search Box

Definition: curie from Philip's Encyclopedia

(symbol Ci) Unit formerly used to measure the activity of a radioactive substance. Named after Marie Curie, it is defined as that quantity of a radioactive isotope that decays at the rate of 3.7 x 1010 disintegrations per second. The curie has been replaced by an SI unit, the becquerel (symbol Bq).


Summary Article: Curie
from The Columbia Encyclopedia

(kürē'), family of French scientists. Pierre Curie, 1859–1906, scientist, and his wife, Marie Sklodowska Curie, 1867–1934, chemist and physicist, b. Warsaw, are known for their work on radioactivity and on radium. The Curies' daughter Irène (see under Joliot-Curie, family) was also a scientist.

Pierre Curie's early work dealt with crystallography and with the effects of temperature on magnetism; he discovered (1883) and, with his brother Jacques Curie, investigated piezoelectricity (a form of electric polarity) in crystals. Marie Sklodowska's interest in science was stimulated by her father, a professor of physics in Warsaw. In 1891 she went to Paris to continue her studies at the Sorbonne. In 1895 she married Pierre Curie and engaged in independent research in his laboratory at the municipal school of physics and chemistry where Pierre was director of laboratories (from 1882) and professor (from 1895).

Following A. H. Becquerel's discovery of radioactivity, Mme Curie began to investigate uranium, a radioactive element found in pitchblende. In 1898 she reported a probable new element in pitchblende, and Pierre Curie joined in her research. They discovered (1898) both polonium and radium, laboriously isolated one gram of radium salts from about eight tons of pitchblende, and determined the atomic weights and properties of radium and polonium. The Curies refused to patent their processes or otherwise to profit from the commercial exploitation of radium. For their work on radioactivity they shared with Becquerel the 1903 Nobel Prize in Physics.

The Sorbonne created (1904) a special chair of physics for Pierre Curie; Marie Curie was appointed his successor after his death in a street accident. She also retained her professorship (assumed in 1900) at the normal school at Sèvres and continued her research. In 1910 she isolated (with André Debierne) metallic radium. As the recipient of the 1911 Nobel Prize in Chemistry she was the first person to be awarded a second Nobel Prize. She was made director of the laboratory of radioactivity at the Curie Institute of Radium, established jointly by the Univ. of Paris and the Pasteur Institute, for research on radioactivity and for radium therapy.

During World War I, Mme Curie devoted her energies to providing radiological services for hospitals. In 1921 a gram of radium, a gift from American women, was presented to her by President Harding; this she accepted in behalf of the Curie Institute. A second gram, presented in 1929, was given by Mme Curie to the newly founded Curie Institute in Warsaw. Five years later she died from the effects of radioactivity. In 1995 Marie and Pierre Curie's ashes were enshrined in the Panthéon, Paris; she was the first woman to be honored so in her own right.

  • Among the numerous and valuable writings of the Curies are Marie Curie's doctoral dissertation, Radioactive Substances (2 vol., 1902;.
  • tr. 1961);.
  • Traité.
  • de radioactivité.
  • (1910);.
  • Radioactivité.
  • (1935);.
  • and her biography of Pierre Curie (1923, tr. 1923). Pierre Curie's collected works appeared in 1908. A biography of Marie Curie was written by her daughter Ève Curie (tr. 1937). See also biographies by R. W. Reid (1974), F. Giroud (tr. 1986), S. Quinn (1995), and B. Goldsmith (2004);.
  • Emling, S., Marie Curie and Her Daughters (2012).
The Columbia Encyclopedia, © Columbia University Press 2017

Related Articles


Full text Article Curie, Marie
Britannica Concise Encyclopedia

(born Nov. 7, 1867, Warsaw, Pol., Russian Empire—died July 4, 1934, near Sallanches, France) Polish-born French physical chemist. She studied at th

Full text Article 7 November 1867
The Hutchinson Chronology of World History

Marie Curie (born Skłodowska), Polish-born French physicist who, with her husband Pierre Curie, discovers polonium and radium, and who wins the Nobe

Full text Article Curie, Marie Sklodowska
Gale Biographies: Popular People

Davy Medal from the Royal Society in London, 1903; Nobel Prize in physics, 1903; Nobel Prize in chemistry, 1911. The Polish-born French physicist Ma

See more from Credo