concentration-time (Ct) product

con·cen·tra·tion-time (Ct) prod·uct

(kon'sĕn-trā'shŭn-tīme prod'ŭkt) A measure, obtained by multiplying concentration of agent by duration of exposure; used to approximate the external dose of a chemical agent existing as a vapor or a gas.
Synonym(s): CT product, Ct product.