TY - JOUR ID - 88675 TI - Studies on Fundamental Interaction Parameters for Stainless Steel and Titanium Biomaterials Using Flattened and Un-Flattened Megavoltage X-Ray Beams JO - Asian Pacific Journal of Cancer Prevention JA - APJCP LA - en SN - 1513-7368 AU - Rajamanickam, Tamilarasan AU - Muthu, Sivakumar AU - Murugan, Perumal AU - Pathikonda, Muddappa AU - Senthilnathan, Krishnamoorthy AU - Nambi Raj, Narayanasamy Arunai AU - Ramesh Babu, Padmanabhan AD - Department of Radiation Oncology, Sri Shankara Cancer Hospital and Research Centre, Bengaluru, Karnataka, 560004, India. AD - Department of Physics, SAS, Vellore Institute of Technology, Vellore, Tamil Nadu, India. AD - Centre for Biomaterials, Cellular and Molecular Theranostics, Vellore Institute of Technology, Vellore, Tamil Nadu, India. Y1 - 2019 PY - 2019 VL - 20 IS - 8 SP - 2485 EP - 2491 KW - Mass attenuation coefficient KW - Total atomic and electronic cross-section KW - Effective atomic number KW - Electron density KW - Mean free path DO - 10.31557/APJCP.2019.20.8.2485 N2 - Purpose: This work presents the measure of fundamental interaction parameters like mass attenuation coefficient(μ/ρ), mean energy, total atomic (σa) and electronic (σe) cross section, effective atomic number (Zeff), electron density(Nel) and mean free path (mfp) using FF and UF megavoltage x-ray beam for high Z implants. Methods: Narrow beamgeometry is used to find out mass attenuation coefficient (μ/ρ) (MAC) which is then used to calculate mean energy (usingNIST data), total atomic (σa) and electronic cross section (σe) for different energies. The effective atomic number (Zeff),Electron density (Nel), mean free path (mfp) for both flattened and unflattened x-ray beams for high Z material stainlesssteel (SS316) and titanium alloy (Grade 5) are studied. Results: The mean energies calculated from NIST data againstmass attenuation coefficient were in good agreement with Monte Carlo value. It shows that spectral weighted effectiveatomic number is independent of megavoltage energies in the Compton region. Effective electron density calculatedusing Zeff and MAC method is lesser compared to direct method for both high Z materials. The mean free path (mfp)is higher along the central axis than off-axis for flattened beam in comparison to unflattened beam for both of the highZ materials studied because of the variation in energy spectrum for both FF and UF x-ray beams. Conclusion: Thisstudy elaborated the fundamental interaction parameters of different energies of flattened and unflattened x-ray beaminteractions with high Z materials such as Stainless Steel (SS316) and Titanium (Grade5) relevant in a clinical scenario. UR - https://journal.waocp.org/article_88675.html L1 - https://journal.waocp.org/article_88675_924de972bdb119a4eed7adc93ea4b0e7.pdf ER -