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The curie is a unit of ionizing radiation (radioactivity), symbolized Ci and equal to 3.7 x 10 10 disintegrations or nuclear transformations per second. This is approximately the amount of radioactivity emitted by one gram (1 g) of radium-226.

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The unit is named after Pierre Curie, a French physicist. It was superseded by the becquerel (Bq) in 1981. The curie is a relatively large unit. To convert curies to becquerels, multiply by 3.7 x 10^10. Conversely, divide by 3.7 x 10^10 to convert becquerels to curies.

Also see ionizing radiation , Standard International System of Units ( SI ), and Table of Physical Units and Constants.

This was last updated in December 2005
Posted by: Margaret Rouse

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  • ionizing radiation

    - Ionizing radiation, also (imprecisely) called radioactivity, is electromagnetic (EM) radiation whose waves contain energy sufficient to overcome the binding energy of electrons in atoms or molecule... (WhatIs.com)

  • becquerel

    - The becquerel is the derived unit of radioactivity in the International System of Units (SI), symbolized Bq and equal to one disintegration or nuclear transformation per second. (WhatIs.com)

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