ABSTRACT
The electron track code KURBUC provides all coordinates of molecular interaction in water vapor, the amount of energy deposited at each event, and the type of interaction at each event. The code simulates the full slowing down of electrons, following the primary electron down to cutoff energy of 7.4 eV, at which point the residual energy is deposited at a random short distance. Tracks were analyzed to provide con‚rmation on the reliability of the code and information on physical quantities, such as range, W values, dose pro‚les, and various microdosimetric parameters derived from model calculations. The calculated ranges in water vapor (density = 1 g cm-3) shown in Figure 17.1 agree with the continuous slowing down approximation (CSDA) ranges of ICRU (1984) within less than 10% deviation for the starting energy of electrons between 100 eV and 1 MeV. The W values are derived from scoring the number of electron-H2O+ pairs due to the ionization process. Table 17.1 shows the calculated W values in water vapor in comparison with experimental data as a function of the starting energy of electrons (Nikjoo et al. 2006). The calculated W value agreed with the experimental data (Combecher 1980).
