Benchmark neutron porosity log calculations: a comparison of MCNP and the specific purpose code McDNL

摘要

Calculations have been made for a benchmark neutron porosity log problem with the general-purpose Monte Carlo code MCNP (Monte Carlo neutron photon) and the special-purpose Monte Carlo McDNL. For accuracy and timing comparison purposes the CRAY XMP and MicroVax II computers have been used with these codes. The CRAY has been used for an analog version of the MCNP code while the MicroVax II has been used for the optimized variance reduction versions of both codes. Results indicate that the two codes give the same results within calculated standard deviations. Comparisons are given and discussed for accuracy (precision) and computation times for the two codes.