'Measurement' of parameters in discrete program using Monte Carlo simulation

A new method is proposed to simulate the scattered photons in high energy X-ray radiography fast and precisely. The problem of X-ray radiography is turned into an effective pure photon transport problem, and an iterative solution to the photon transport equation is designed. Then, the solution is turned into a discrete version and realized in a computer program. After, the Monte Carlo N-particle transport code MCNP is used to 'measure' the effective photon scattering function and other parameters needed in the discrete method. Finally, the new computer program is compared with MCNP in a radiography example as a check of the method. It is consistent with MCNP for the radiography of thin objects, but shows large deviation for thick ones. The current computer program can be used in qualitative analysis. (authors)