@prefix isq: <https://w3id.org/standards/isq/ontologies/core/> .
@prefix smart: <https://example.org/smart-sdu/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

<isq:t10-27>
  a isq:Entry ;
  rdf:type isq:Quantity ;
  rdf:type smart:TermEntry ;
  dcterms:identifier "10-27" ;
  skosxl:prefLabel "activity"@en ;
  skosxl:altLabel "A"@en ;
  skos:definition "differential quotient of stem:[N] with respect to time, where stem:[N] is the mean change in the number of nuclei in a particular energy state due to spontaneous nuclear transformations in a time interval of duration (<<iso80000-3>>) stem:[\"d\"t]:\n\n[stem%unnumbered]\n++++\nA = -(\"d\"N)/(\"d\"t)\n++++\n"@en ;
  smart:hasBindingnessType "bindingness-type:normative" ;
  dcterms:isPartOf <isq:part-10> ;
  isq:hasUnit [
    skos:notation "Bq" ;
    skosxl:prefLabel "becquerel"@en
  ] ;
  isq:hasUnit [
    skos:notation "s^(-1)" ;
    skosxl:prefLabel "per second"@en
  ] ;
  skos:note "For exponential decay, stem:[A = lambda N], where stem:[lambda] is the decay constant (<<t10-24>>).\n\nThe becquerel (stem:[\"unitsml(Bq)\"]) is a special name for second to the power minus one, to be used as the coherent SI unit of activity.\n\nIn report 85a of the ICRU a definition with an equivalent meaning is given as: The activity, stem:[A], of an amount of a radionuclide in a particular energy state at a given time is the quotient of stem:[-\"d\"N] by stem:[\"d\"t], where stem:[\"d\"N] is the mean change in the number of nuclei in that energy state due to spontaneous nuclear transformations in the time interval stem:[\"d\"t]:\n\n[stem%unnumbered]\n++++\nA = -(\"d\"N)/(\"d\"t)\n++++\n\nSee also <<cls-0.3>>.\n"@en ;
  iso:urn <urn:iso:std:iso:80000:-10:ed-2:en:item:10-27> .