Determination of Radiological Properties of 3D Dosimeters and Human Tissues for Heavy Charged Particles Interaction Using Srim program

Abstract

This research discusses the relation between medium and incident heavy charged particles passing through it. The main objective of this research is investigation of the radiological properties of three dimensions (3D) dosimeters which include polymer gels, Fricke gel and PRESAGE gels dosimeters, and some human tissues, with respect to their mass stopping cross section, effective atomic number (Zeff) and electron density (Ne) in the continuous energy range from 0.01- 1000 MeV of ions. SRIM code was used to generate mass stopping power of elements. The effective atomic number (Zeff) and electron density (Ne) were calculated for proton, 4He, 11B, 12C and 16O ion interactions using logarithmic interpolation method. Variations of effective atomic number (Zeff) and electron density (Ne) with the kinetic energy of ions were observed over the whole energy range for all studied materials which is up to (24%,10%) for polymeric gels, (27%, 11%) for Fricke gel, and (17%, 8%) for PRESAGE gels for proton interaction. For 4He ion, variations are up to (24%, 10%), (23%, 11%) and (18%, 9%) for polymeric gels, Fricke gel, and PRESAGE gels, respectively. For other ions, variation is up to (33%, 14%) for polymeric gels as well as Fricke gel, and (28%,13%) for PRESAGE gels. Maximum values of (Zeff) have been observed in intermediate energies between 1-10 MeV for all dosimeters, except for PRESAGE gels where maximum values were observed in the low energy range 10 – 100 keV. For effective atomic number relative to water, polymeric gels and Fricke gel have shown excellent water equivalency with very small differences in (Zeff) throughout the entire energy range for all incident ions studied, while PRESAGE dosimeters show good water equivalence properties only at high energies for all ions. For human tissues the highest variation in (Zeff) for ion interaction is occur in bone, cortical (ICRU-103) for all ions. Skeletal Muscle (ICRP ICRU-201) and Striated Muscle (ICRP ICRU-202), have the best water equivalence in the entire energy range of proton, and Lung Tissue (ICRP), Striated Muscle (ICRP ICRU-202), have the best water equivalence in the entire energy range for other ions. MAGIC is an excellent tissue equivalent material for Lung Tissue (ICRP) and Skeletal Muscle (ICRP ICRU-201). Fricke and BANG-1 gel are an excellent tissue equivalent for Lung Tissue (ICRP), Skeletal Muscle (ICRP ICRU-201) and Striated Muscle, (ICRP ICRU-202), whereas PRESAGE could be considered as a good tissue equivalent to Lung Tissue (ICRP), IV Skeletal Muscle (ICRP ICRU-201) and Striated Muscle (ICRP ICRU-202) at different ranges of proton energy. None of these dosimeters could simulate Adipose tissue (ICRP ICRU-103) for proton interaction above 1 MeV. For 12C ion interaction, MAGIC, BANG-1 and Fricke gel have good tissue-equivalent properties throughout the entire energy range for Lung Tissue (ICRP), Skeletal Muscle (ICRP ICRU-201) and Striated Muscle, (ICRP ICRU-202). PRESAGE gel show low differences only for energies greater than 2 MeV. Generally, it is found that polymer and Fricke gels match human tissues more than water do. Data reported here give essential information about interaction of different types of charged particles with different materials and could be useful in the energy range specified.