Studies on Neutron and Photon Kerma Parameters for Human Body Organs

Abstract

A study on neu tron kerma fac tors and pho ton air-kerma for hu man or gans is pre sented for neu tron en ergy range 2.53 10–8 to 29 MeV and pho ton en ergy range 1 keV to 20 MeV. The human or gans wa ter equiv a lence for pho ton and neu tron, is also pre sented. The ra tio of the mass-energy ab sorp tion co ef fi cients of hu man or gans to wa ter was found con stant and unity above 100 keV, whereas there was a large differ ence for en er gies be low 100 keV. The neutron kerma factors of hu man or gans and wa ter are found of same order of mag ni tude whereas differs for air. The neutron kerma fac tors of human organs and tissue sub sti tutes were found to be equal to wa ter for neutron en er gies be tween 63 eV and 200 keV. The skel e ton-cor ti cal bone was found to be away from water equiv a lence for low-en ergy photons and high-en ergy neutrons.