MonteCarlo research of flash radiography about FTO at 3m to the target

The Xray transport of flash radiograph about FTO（French test object）was studied. Within the recording plane at 3m, the direct and scattering exposures, the directscattering ratio, the spatial spectrum distributions of direct and scattering exposure and flux are respectively given by means of MonteCarlo simulation. It can be concluded from these results that the back cone, from which 97% scattering exposure comes, is the primary scattering source and the key component which makes the spatial distribution of scattering exposure nonuniformity 58%. The minimum directscattering ratio of the radiograph system is so small that the direct exposure can be ignored in comparison with the scattering exposure. The record method with high resolution is used during the simulation, and the recon