Continuous Slowing Down Approximation Range of Electrons in Human Tissues

Mohammed, Musaab Imad

doi:10.33899/rjs.2025.186497

	Continuous Slowing Down Approximation Range of Electrons in Human Tissues
Rafidain Journal of Science
Volume 34, Issue 1, March 2025, Pages 78-90 PDF (728.05 K)
Document Type: Research Paper
DOI: 10.33899/rjs.2025.186497
Author
Musaab Imad Mohammed
General Directorate of Salah al-Din Education
Abstract
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.
Keywords
Incident electron energy; total stopping power of electrons; human tissues; data fitting; international code e-star

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