Quantum mechanical proton range in human body

Document Type : Conference Proceedings


Department of Physics, Payame Noor University, Tehran, Iran,


Introduction: Proton therapy delivers radiation to tumor tissue in a much more confined way than conventional photon therapy thus allowing the radiation oncologist to use a greater dose while still minimizing side.
Materials and Methods: protons release most of their energy within the tumor region. As a result, the treating physician can potentially give an even greater dose to the tumor while minimizing unwanted side effects. This is especially important when treating children, because protons help reduce radiation to growing and developing tissues. In this work by Bethe formula using quantum mechanics we determine stooping power, mass stopping power and range of proton in substances of human body and compared our obtained results with available experimental data.
Results: We calculated mean excitation energies, I using the quantum mechanical approach in muscle, bone, water, tissue. Our obtained results show that this parameter will change from 19 to 1000 eV. After that by Bethe formula using quantum mechanics with determining stooping power, mass stopping power and range of proton in ovary, breast, eye lens, lung, adipose, brain blood, bone, muscle and water we find that both of stopping and mass stopping power at first increases with enhancement of proton energy then decreases while, range of protons increases with increasing of proton energy.
Conclusion: In this research, by Bethe formula using quantum mechanics the numerical values of stopping, mass stopping power and proton range in substances of human body are determined accurately and these obtained results help more accurately treat cancer patients using proton therapy.


  • Receive Date: 21 May 2018
  • Revise Date: 06 April 2019
  • Accept Date: 06 July 2018
  • First Publish Date: 01 December 2018