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Photonics Dictionary

activity

1. Synonymous with radioactivity. The intensity of a radioactive source illustrated as the number of atoms disintegrating in unit time, or as the number of scintillations or other effects observed per unit time. Activity is frequently expressed in curies, one unit being equal to 3.7 x 10-10 disintegrations per second. 2. In a reacting system, the evident effective concentration of a body of matter.
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