International Journal of Physics, 2017, Vol. 5, No. 3, 92-98 Available online at http://pubs.sciepub.com/ijp/5/3/5 ©Science and Education Publishing DOI:10.12691/ijp-5-3-5 Calculations of Stopping Power, and Range of Ions Radiation (Alpha Particles) Interaction with Different Materials and Human Body Parts M.O. El- Ghossain * Department of Physics, The Islamic University of Gaza, Gaza, Palestine *Corresponding author: ghossain@iugaza.edu.ps Abstract Radiation is naturally present in our environment and artificially in hospitals, both types of radiation interact with human body. In this work we studied interaction of Ions radiations and alpha particles with matter; we calculated the stopping power (in MeV cm2/g) and Range from the theory of Bethe-Bloch formula as giving in the reference. This has been done for different target materials in biological human body substances such as water, bone, muscle and tissue and at different energies of the ions. All these calculations were done using different programs; SRIM, STAR and Matlab, the results will be shown for Range Vs energy, and stopping power vs energy. Fitting model was employed using Matlab for water. Total stopping power was obtained by summing the electronic collisional and radioactive stopping power of the target materials, and then employing the continuous slowing down approximation (CSDA) to calculate the path length (Range). The total stopping power is proportional to Z 2 , Z/A, and I, increases rapidly at low energies, reaches a maximum and decreases gradually with increasing energy. Keywords: stopping power, range, alpha particles, dose, human body, Matlab Cite This Article: M.O. El- Ghossain, “Calculations of Stopping Power, and Range of Ions Radiation (Alpha Particles) Interaction with Different Materials and Human Body Parts.” International Journal of Physics, vol. 5, no. 3 (2017): 92-98. doi: 10.12691/ijp-5-3-5. 1. Introduction The Stopping power and energy dissipation of charged particles through matter has been a subject of great interest for 100 years [1,2,3] because of its wide areas of application, such as ion implantation, fundamental particle physics, nuclear physics, radiation damage, radiology [2,3]. Heavy charged particles traversing matter lose energy primarily through the ionization and excitation of atoms [4]. The stopping power is defined as the mean energy loss per unit path length–dE/dx. It depends on the charge and velocity of the projectile and, of course, the target material [5,6]. Early investigations of the energy loss of charged particles traversing matter arrive at a general stopping power formula [6]. If an ion beam penetrates through matter it loses energy due to collisions with electrons (electronic stopping) and target nuclei (nuclear stopping) [7]. The total stopping power is then just the sum of the stopping powers due to electronic and nuclear interactions [8,9]. At low energies the total energy loss is usually described in terms of electronic stopping power [10]. The nuclear component of the stopping power can also be ignored [7]. The possible phenomena contributing to the electronic stopping in the velocity region well below the light velocity are [9]: 1. Momentum Exchange in a Collision between the Ion and a Free Electron in the Target Material. 2. Ionization of the Ion. 3. The Ion Captures An Electron. 4. Excitation of the Ion. 5. Excitation of a Target Atom 6. Ionization of a Target Atom. 7. Collective Effects Such As the Polarization or the Plasmon Excitation In this work the interactions of ion radiation with matter will be studied, this will include the heavy charged particles like alpha particles and ions, also we will show the effects of theses interactions with human body, skin, and bone, skeletal and different parts of the body. Energy loss and dose are correlated with each other and help to formulate the interaction of internal and external radiation with matter to predict the affectivity of the radiation treatment and the possible damage to adjacent body tissue. Radiation treatment is based on different kind of radiation and depends on the different kind of interaction between the radiation and matter (body tissue) [9], the energy loss and dose which human body might exposed during medical treatments or accidents or from natural radioactivity, this will help us in the dose limit and to be more protected, in Gaza we use different kind of radiation in universities, hospitals, knowing the energy loss, dose will help us to protect ourselves and our environment. The stopping power, energy loss, range, straggling and equivalent dose rate of ions in air, tissue and polymers are very important in many research and application fields, such as radiation dosimetry, radiation biology (such as cell lethality, cytogenesis changes, mutagenesis and DNA