Ponente
Guillermo Hernández
(Universidad de Salamanca)
Descripción
Accurate modeling of x-ray spectra emerging from a tungsten converter –typically the anode of an x-ray tube– is useful for some medical applications, medical imaging and radiation dosimetry being of special relevance among them. Other fields of application, such as security scanning or food contaminant irradiation, may also benefit from developments in x-ray spectral descriptions beyond the usual range of medical imaging.
Semiempirical methods model x-ray production by using experimental or simulated data in a physically-based framework. This work extends the results of previous semiempirical models, producing more accurate results and extending the model to the orthovoltage energy range.
Electron fluence in a tungsten converter is modeled taking into account both the energy and angular distributions, each of them adjusted to FLUKA simulated data. Distances were scaled by the CSDA range to reduce the energy dependence. Bremsstrahlung production was found by integrating the cross section with the fluence in a one-dimensional penetration model. Characteristic radiation was added using a semiempirical law whose validity was checked. The results were compared the experimental results of Bhat et al., with the SpekCalc numerical tool, and with MCNPX simulation results from the work of Hernandez and Boone. The results found are in good agreement with simulation results in the 50-640 keV energy range.
Autores primarios
Guillermo Hernández
(Universidad de Salamanca)
Prof.
francisco fernandez
(Universidad de Salamanca)
