Curie
Curie (unit)
Curie (symbol: Ci) is a non-SI unit of radioactivity, named after the pioneering scientists Marie Curie and Pierre Curie. Pronounced as /ˈkyʊəri/, the term originates from the Latin Curia, meaning court.
Definition
The Curie is defined as the quantity of any radioactive nuclide in which the number of disintegrations per second is 3.7 × 1010. This is roughly the activity of 1 gram of the radium isotope Radium-226, which was studied by the Curies.
Usage
The Curie was formerly used extensively in the field of radiology and nuclear medicine, but has been largely replaced by the SI unit Becquerel (Bq). However, it is still used in some contexts, particularly in the United States.
Related Terms
- Becquerel: The SI unit of radioactivity, equivalent to one nuclear disintegration per second.
- Radium: A chemical element, symbol Ra, atomic number 88. It is an alkaline earth metal, the heaviest of the stable elements, found in trace amounts in uranium ores.
- Radioactivity: The spontaneous emission of radiation, either directly from unstable atomic nuclei or as a consequence of a nuclear reaction.
- Radiology: The science dealing with X-rays and other high-energy radiation, especially the use of such radiation for the diagnosis and treatment of disease.
- Nuclear Medicine: A medical specialty involving the application of radioactive substances in the diagnosis and treatment of disease.
External links
- Medical encyclopedia article on Curie
- Wikipedia's article - Curie
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