Energy deposition study in the intensifying screens by numerical simulations

摘要

The detection of low X fluences up to 10 MeV requires increasing the capabilities of the radiographic reception. The efficiency determination of a calcium tungstate screen film pair implies the energy deposition knowledge. For this purpose, a collaboration with the Atomic Physics Center of Toulouse has begun in order to improve the efficiency owing to a parametric study of the energy deposition in the calcium tungstate by means of a Monte Carlo type code of the interaction of ionizing radiation with matter. For the interpretation of the data, software on a VAX 11/780 has been created. The following results, given for 3.8 MeV photons (equivalent energy for the GREC generator), are outlined: (1) a significant increase of the energy deposition in the intensifying screen when this one has a metal screen (Pb; W) in front of it; (2) for the tungsten metal screen, it exits a boundary thickness beyond which the energy deposition does not increase. Moreover, the radial energy deposition leads to the energy spread and the resolution study.