has dimension has unit 単位を持つ has value 値を持つ activity activiteit A Activity is the decay rate of a radioactive substance. It is a derived quantity in the International System of Units. Activity is 1 divided by time. activity (of a radionuclide) activity of a radionuclide activity unit quantity 量 attobecquerel attobecquerel becquerel becquerel centibecquerel centibecquerel curie curie decabecquerel decabecquerel decibecquerel decibecquerel exabecquerel exabecquerel femtobecquerel femtobecquerel frequency dimension gigabecquerel gigabecquerel hectobecquerel hectobecquerel kilobecquerel kilobecquerel megabecquerel megabecquerel microbecquerel microbecquerel millibecquerel millibecquerel nanobecquerel nanobecquerel petabecquerel petabecquerel picobecquerel picobecquerel reciprocal second omgekeerde seconde terabecquerel terabecquerel