چكيده فارسي :
In the present work , calculated mass attenuation coefficients ,atomic cross section and electron density for these tissue and bone were theoretically calculated using monte carlo program within a range of energies of x-rays (16.5-17.5-21.5-24.5)keV .The attenuation coefficient of substances ,at any energy of x-ray photon ,is known to depends on the electron density and effective atomic number of the material .which makes it very sensitive to the index x .Several different values laying between ) 0.5 - 2.5( step 0.5 have been suggested for the exponent x.The results were compared with XCOM program .These theoretical values are found to be in agreement with the calculated from XCOM value . Keywords: Monte Carlo program, XCOM package, mass attenuation coefficient, electron density.
