Characterization of X-Ray Reference Beam to Establish a Set of Conversion Coefficients for The Calibration of Radiation Measuring Equipment and Calculation of BSF with MCNP Code |Biomedgrid

X-ray beam characterization for the calibration of radiation measuring equipment is necessary to meet the requirements of the recommendations by international organizations. In the present study, characterization of X-ray beam generated from X-ray irradiator, Model: X80-225KV, Hopewell Design, Inc of Secondary Standard Dosimetry Laboratory (SSDL) has been performed in accordance with the ISO 4037-1 narrow–spectrum series. The beam characterization was done by the determination of half-value layer (HVL), the effective energy, homogeneity coefficient (HC), beam quality index and output air Kerma values. Experimentally measured HVL is compared with the values recommended by ISO-4037. The effective energy, Eeff, for ISO narrow spectrum series were calculated by empirical relation derived from Hubble mass attenuation coefficients. Hence, a set of conversion coefficients has been established for the effective energies Eeff of photon beam from air Kerma to dose equivalent (Sv/Gy) i.e., for ambient dose equivalent, H*(10) & directional dose equivalent, Hp'(0.07) and personal dose equivalent, Hp(10)&Hp(7) for ISO beam code N40, N60, N80, N100, N120, N150 and N200 by empirical mathematical relationship applicable for the photons with energies between 10keV to 10MeV. An evaluation of backscattering factors for ISO water phantom and ICRU slab phantom has been conducted by MCNPX Code. The calculated values were compared with the values found in the literature.