Methods of Biasing Secondary Gamma-Ray Production in Coupled Neutron Gamma- Ray Monte Carlo Calculations.

Methods of Monte Carlo biasing using two-dimensional discrete ordinates adjoint flux

“…where L is the number of regions along the particle's trajectory and Tl• is the number of mean free paths from the particle's (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22) where Pr; is the probability that the next collision will occur in the ith region and Pre is the probability that the next collision will be in the external void. In principle, the path length can be selected from Equation (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19).…”

“…as follows:l. First determine the region where the next co•11 is ion wi 11 occur from Equation(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22). If the next collision is in region 11 i,11 select the number of mean free paths n the particle travels in this region from -(n-n. ) Compute the number of mean free _paths between the new collision site and _the last_ collision site by nt ~ n;_ 1 + n .…”