NUMERICAL CALCULATION OF MASS STOPPING POWER AND RANGE FOR AN INCIDENT PROTON IN BREAST TISSUES FOR THE ENERGIES OF (1- 100 MEV)

In this work  the stopping power and energy range for proton was found  by using numerical method  and  other two  simulation  techniques. The values of stopping power have been calculated in the range of energies between 1 MeV to 100 MeV in breast tissue. The total stopping power was calculated numerically using  an equation which is derived by Eko Sulistya. The criterion for the total stopping power that obtained when summing the electronic and radioactive stopping power is obtained from PSTRA and SRIM 2013 simulation programmes. The range can be determined numerically by continuous slowing down approximation (CSDA). The result of these three methods agree with the PSTAR (NIST) data and SRIM 2013 within different percentage less than 3 %.  The quantitative comparison done with other results showed that it has an overall good agreement within different percentage less than 10 %. The data will be useful for applications in radiobiology and researchers. The main stopping power mechanism is the slowing down due to interactions with target atoms through excitations and ionization of target electrons via Coulomb interaction.

The precise determination of the proton energy in radiotherapy planning can be achieved if the stopping power of protons is specified for body tissue .The equation of Bethe-Bloch is meanly used to understand how to calculate the stopping power of proton, but not for radiative energy loss.