Estimation of stopping power of high energy electrons in eye lens, bone cortical and soft tissue

Abstract

The research examines the stopping-power of high energy electron beams between 50 MeV and 600 MeV to establish their appropriateness for radiotherapy applications. The electromagnetic properties of electron beams enable scanned intensity modulation which photon beams cannot achieve during radiotherapy. The research established the stopping-power of radiotherapy electrons between 50 MeV and 600 MeV in eye lens tissue and bone cortical tissue and soft tissue according to ICRP recommendations. The authors applied a three-parameter approximation in MATLAB 2018 language to fit kinetic energy (MeV) for electrons at higher energy ranges using the overall mass stopping-power (-δ) from density effects combined with radiative stopping-power from Bragg's valence law for compound targets (Z/A) and half 50 MeV to 600 MeV semi-experimental stopping energy equations. The experimental stopping-power data (ESTAR) program was used for fitting the results which led to the calculation of STEYX error ratio and correlation coefficient. Our results match the ESTAR code values exactly with a correlation coefficient of 0.999. This paper aims to provide an updated overview of mass stopping-power electrons, with a focus on the requirements of electron radiotherapy in which electrons are delivered to the tumor site. The semi-experimental results are compared.