Stopping Power of Electrons in Bone, Brain Tissues, and Eyes View PDF

^*Rashid O Kadhim
Department Of Physics, University Of Kufa, Iraq

^*Corresponding Author:

Rashid O Kadhim
Department Of Physics, University Of Kufa, Iraq

Published on: 2020-03-11

Abstract

In this research, the ability to stop collision and radiation as well as the total ability to stop electrons was calculated using the relative Bethe-Bloch equation in human tissues (bone, brain, and eyes) in the energy range (0.01-1000) MeV and the equations were programmed using the MATLAB language. The obtained results showed that the collision stopping power is the dominant of radiation from the total stopping power. An appropriate curve instrument was used as two semi-empirical equations with their constants were obtained. The calculated results were compared to the results of the E-Star code and showed good agreement with practical values.

Keywords

Stopping power; Bethe-Bloch; Human tissue

Introduction

When charged particles pass through the physical media, they lose a portion of their energy continuously in many collisions, ionize atomic electrons, move at velocity v, with a charge of Z1e, and a mass of m [1]. And since the movement of the charged particles generates an electromagnetic force on the electrons in the atom, it provides it with a card, and this energy added to the atom may succeed in removing an electron from the atom and its atomization or leaving The atom is in an irregular state [2]. The stopping power evaluations two different ways: the first is to consider the interactions of incoming of the electron and positron with target electrons, which is called collisional stopping power while the second is considered the fact that accelerated charged particles is radiated, which is called radiative stopping power or Bremsstrahlung Loss [3], the primary goal of the theoretical understanding of these processes is to predict the rate of lost energy ratio of the particle for each unit of the transmission distance as a function of the energy of the particle. MeV.cm-1. Divide the stopping power by the density of the material ρ that gives a close relationship to it: mass stopping power ((-dE)/ρdX) and express it in units of MeV. cm2.g-1 [4].