Stopping power calculations of water, Al2O3 (TLD-500) and lung for proton and heavy ıons used in radiotheraphy

In this study, the energy losses in unit length (or stopping power) of protons and carbons as heavy ions used in radiotherapy, during their movements in the , were theoretically calculated for water, TLD-500 and lung by using two analytical equation. One of these equations is the mass stopping power equation suggested by Bethe-Bloch (1930-1933) and modified by Tsoulfanidis (1995). The other one has been obtained by substituting efective z (z *), Z (Z *) and I (I *) values, which are used for electrons in literature, into equation reported by Tsoulfanidis. Although the energy range of protons and heavy ions is 75-200 MeV in the radiotherapy, in this study 0,001-10000MeV energy ranges was performed to identify the stopping power at lower and higher energy levels. The results are compared with ``NIST PSTAR Data Base??, ?SRIM 2011?, ?MSTAR? and literature.Key Words : Stopping power, TLD-500, Dosimetry, Radiation dose