a case study of energy absorption buildup factors in some human bones for gamma energies 30 kev to 1.5 mev

human body consists of some tissues among which bone is one of the important living and growing tissue . in this research, energy absorption buildup factor (eabf) values of 27 types of bone have been computed for photon energy 0.03 to 1.5 mev up to 40 mean free path (40mfp) penetration depths. the inner bone tissue, spongiosa and male sternum had the largest values of eabf in low photon energies, and great differences below 150 kev photon energy were noted relative to the other bones. this study would be of utmost  importance for estimation of the effective dose to the human bones, radiation therapy and various medical applications.