![]() ![]() Toward calculating Z eff, the charged particle stopping power in a specific medium was carried out of the NIST database. ![]() Most of these calculations were based on averaging and interpolating the available data 4, 5. There have been many studies for calculating the effective atomic number for various materials. When the medium is a compound, the atomic number will be defined as the effective atomic number 3. Thus, in known energies, this parameter varies depending on the medium's atomic number 2. Also, the amount of the transferred energy of the charged particles is calculated using their stopping power. This parameter depends on the medium atomic number. In the event of photons in specific energy, the value of the delivered energy is calculated using the mass absorption coefficient 1. One of the most effective parameters that define the radiation features of a material is the atomic number. In the different fields such as radiotherapy and dosimetry the radiological properties of materials can be applied in estimating absorbed dose, buildup factor, and shield design. The effective atomic number can be applied to characterize the radiological properties of materials. Results of the calculations based on the collision stopping power showed that in low kinetic energy, the values of the effective atomic number are equal to the total number of electrons in each molecule of the compound, which is quite justified by the physics of Bethe's formulas. Taking into account the direct calculation method based on the collision stopping power, the effective atomic number for electron, proton, alpha, and carbon particles is determined for a group of dosimetry and tissue equivalent materials. In this research, considering the Coulomb interaction of charged particles, using the collision stopping power and the NIST library data, the effective atomic number of various materials at different energies is calculated for common radiotherapy particles such as electron, proton, alpha, and carbon ions. As an important component in medical applications, dosimetry, and radiotherapy studies, the effective atomic number of body tissue, tissue equivalent substances, and dosimetry compounds are investigated. ![]()
0 Comments
Leave a Reply. |