Continuous Slowing Down Approximation Range of Electrons in Human Tissues

In this research, two analytical formulas were found to calculate the continuous slowing down approximation range (CSDA range) of electrons within the energy range from 10 MeV to 1000 MeV in the human tissues (blood, dense bone, bone cortex, brain, eye lens, lung, skin, testicles). The two new formulas were found using the data fitting method and depending on data obtained from the International Code (E-Star) values and the International Commission on Radiation Units and Measurements Report No. 37 of 1984 (ICRU Report 37). The first formula was found as a function of the energy of the incident electron only, and the largest deviation in the results obtained from this formula was about (6.21%). The second formula was found as a function of the total stopping power of the electrons only, and the largest deviation in the results obtained from this formula was about (6.95%). The two new formulas are considered simplified formulas and can be applied easily and without the need to perform complex mathematical operations and as a function of only one variable. The previous formulas are complex formulas that depend on a large number of constants and as a function of more than one variable and require many repeated and complex mathematical operations.