MultiTrans SP_3 code in coupled photon-electron transport problems

摘要

Detailed modeling of photon and electron transport is advantageous in radiotherapy and dosimetry.MultiTrans radiation transport code is based on tree multigrid technique and SP_3 approximation.The standard SP_3 approximation has been extended into a form that takes into account anisotropic group-to-group scattering.A first collision source method has been implemented.Applicability range of standard and extended SP_3 approximations in coupled photon-electron transport problems is examined by comparing calculated doses with deterministic MultiTrans and stochastic EGS4 radiation transport codes.