Definition of specific activity in English:

specific activity

Syllabification: spe·cif·ic ac·tiv·i·ty

noun

Physics
  • The activity of a given radioisotope per unit mass.

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Word of the day astrogation
Pronunciation: ˌastrə(ʊ)ˈgeɪʃ(ə)n
noun
(in science fiction) navigation in outer space