Journal
RADIATION PHYSICS AND CHEMISTRY
Volume 179, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.radphyschem.2020.109196
Keywords
Mass attenuation coefficient; Effective atomic number; Energy absorption and exposure buildup factor
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This study focused on the radiation interaction parameters of four calcium compounds commonly used in thermoluminescence dosimetry. CaCO3 was identified as the best tissue equivalent material among the studied calcium-based TLD materials.
This study focused on radiation interaction parameters of four compounds of calcium which are the most common types of thermoluminescence dosimetry (TLD). Firstly, the mass attenuation coefficients (MAC, mu/rho) and effective atomic numbers (Z(eff)) of calcium based-TLD materials such as CaSO4, CaF2, Ca5F(PO4)(3) and CaCO3 were measured in the energy region 121.87-1408.01 keV. The values of MACs and Z(eff)s of CaSO4, CaF2, Ca5F (PO4)(3) and CaCO3 were then theoretically calculated at same photon energies. Good agreements were observed between the experimental and theoretical results for MAC and Z(eff) values (diff. <= 8.17%). In addition, the mass energy absorption coefficients, Kerma relative to soft tissues, equivalent atomic number (Z(eq)), and buildup factors (energy absorption and exposure buildup factors; EABF, EBF) were theoretically calculated in the energy region 0.08-2 MeV. The results displayed significant changes in equivalent atomic number, such that these values increased with the increasing energy and after 1 MeV it generally decreased. CaCO3 was finally found the best tissue equivalent material because of fact that the values of Kerma and Z(eff) ratios were nearest to unity (1) among calcium-based TLD materials at the studied energies.
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