A simple reliable formalism is presented for obtaining nucleon-nucleon cros
s sections within a nucleus in nuclear collisions for a given projectile an
d target nucleus combination at a given energy for use in transport, Monte
Carlo and other calculations. The method relies on extraction of these valu
es from experiments and has been tested for absorption experiments to give
excellent results. (C) 1999 Elsevier Science B.V. All rights reserved.