Numerical calculation of energy deposition by broad high-energy electron beams: II. Multi-layered geometry

For pt.I, see ibid., vol.34, p.1371-96 (1989). The phase space time evolution model of Huizenga and Storchi has been modified to handle dose deposition calculations by broad high-energy electron beams in homogeneous non-water media and in a multi-layered geometry. This is a further development aimed at the use of a phase space time evolution model in radiotherapy treatment planning. In the model presented a different approach to the step-size choice and photon energy deposition has been chosen. The results of the numerical depth-dose calculations are in very good agreement with Monte Carlo calculations with the ITS and EGS codes and for lighter materials like water aluminium. For high-Z materials like gold or lead agreement between numerical and Monte Carlo results is also moderately good.