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Friday, 17 November 2006 01:00
A Curie (Ci) is a standard measurement for radioactivity, specifically the rate of Decay for a gram of radium - 37 billion decays per second. A unit of radioactivity equal to 3.7 x 10 10 disintegrations per second.
Other /More definition:
A curie (Ci) is a unit quantity of any radioactive nuclide in which there are 37 billion atomic transformations (disintegrations) in one second. A measure of radioactivity based on the observed decay rate of approximately one gram of radium. The Curie was named in honor of Pierre and Marie Curie, pioneers in the study of radiation.

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Portrait of Marie Curie (1867-1934), Physicist

by Smithsonian Institution

Creator/Photographer: Transocean (Photographic company, Berlin) Medium: Medium unknown Date: Prior to 1934 Collection: Scientific Identity: Portraits from the Dibner Library of the History of Science and Technology - As a supplement to the Dibner Library for the History of Science and Technology's collection of written works by scientists, engineers, natural philosophers, and i . . .

Nobelprijswinnaar Marie Curie / Nobel price winner Marie Curie

by Nationaal Archief

Spaarnestad Photo, SFA002003458 Nobelprijswinnaars. De Pools-Franse natuur- en scheikundige Marie Curie (1867-1934) in haar laboratorium. Ontving in 1903 samen met haar echtgenoot de Nobelprijs voor Natuurkunde en in 1911 in haar eentje de Nobelprijs voor Scheikunde. Frankrijk, datum onbekend. Marie Curie, winner of two Nobel prices (physics 1903 and science 1911) in her laboratory. France, date unknown.

Pierre Curie (1859-1906) and Marie Sklodowska Curie (1867-1934), c. 1903

by Smithsonian Institution

Creator: Science Service Subject: Curie, Marie 1867-1934        Curie, Pierre 1859-1906 Type: Black-and-white photographs Date: 1903 Topic: Nobel Prizes      Physics      Women scientists Local number: SIA Acc. 90-105 [SIA2008-0751] Summary: Pierre Curie (1859-1906) and Marie Sklodowska Curie (1867-1934) were jointly awarded the Nobel Prize for Physics in 19 . . .

O. Barlow Willmarth (LOC)

by The Library of Congress

Bain News Service,, publisher. O. Barlow Willmarth [between ca. 1910 and ca. 1915] 1 negative : glass ; 5 x 7 in. or smaller. Notes: Title from unverified data provided by the Bain News Service on the negatives or caption cards. Forms part of: George Grantham Bain Collection (Library of Congress). Format: Glass negatives. Rights Info: No known restrictions on publication. Repository: Library of Congress, Prints and Photographs Division, Washington, D.C. 205 . . .

Mme. Curie and 4 students (LOC)

by The Library of Congress

Bain News Service,, publisher. Mme. Curie and 4 students [between ca. 1910 and ca. 1915] 1 negative : glass ; 5 x 7 in. or smaller. Notes: Title from unverified data provided by the Bain News Service on the negatives or caption cards. Forms part of: George Grantham Bain Collection (Library of Congress). Format: Glass negatives. Rights Info: No known restrictions on publication. Repository: Library of Congress, Prints and Photographs Division, Washington, D. . . .
 

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