macroscopic cross-section
The cross-section per unit volume of a given material for a specified process. For a pure @N04257@, it is the product of the @M03911@ and the number of target nuclei per unit volume; for a mixture of nuclides, it is the sum of such products.
Orange Book, 2nd ed., p. 218 [Terms] [Book]
PAC, 1994, 66, 2513. (Nomenclature for radioanalytical chemistry (IUPAC Recommendations 1994)) on page 2517 [Terms] [Paper]