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aktiivsuse SI-ühik; vastab radioaktiivse aine aktiivsusele üks lagunemine sekundis
unit of activity of a radioactive source corresponding to one disintegration per second (one curie = 3.7 x 1010 becquerel (Bq)), radioaktiivse ainekogumi aktiivsuse mõõtühik
the International System unit of activity of a radionuclide, equal to the activity of a quantity of a radionuclide having one spontaneous nuclear transition per second, radioaktiivse preparaadi aktiivsuse mõõtühik