"The \"Activity Concentration\", also known as volume activity, and activity density, is ." . "\\(c_A = \\frac{A}{V}\\), where \\(A\\) is the activity of a sample and \\(V\\) is its volume."^^ . "http://www.iso.org/iso/catalogue_detail?csnumber=31895"^^ . . . "http://www.euronuclear.org/info/encyclopedia/activityconcentration.htm"^^ . "c_A" . . . . . . "Activity Concentration"@en . .