Estimated Radiation Dose vla ^<56>Fe in Man for 14 MeV Neutrons

概要

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An attempt has been made to evaluate possible radiation hazards due to whole body irradiation by 14.8MeV neutrons through all possible nuclear reactions with ^<56>Fe in the human body. Amount of ^<56>Fe transmuted and also radioactivity thus produced and doses are calculated. The computed doses and cross sections due to various possible reactions with ^<56>Fe along with their recoil contributions are tabulated. The estimated amount of ^<56>Fe transmuted is 0.61x10^<-22>% per unit neutron flux and total dose from primary and secondary reactions is about 2.4x10^<-11>m rad. per unit neutron flux. The dose due to induced activity of residual nuclei ^<56>Mn and ^<55>Fe is about 10^<-17> m rad. per unit neutron flux per second. For calculating LET distribution many workers have calculated energy deposition by fast neutrons. Randolph has calculated energy deposition in human body taking the elements ^1H, ^<12>C, ^<14>N, ^<16>O as the constituents of the body. Similar calculations have been made by Bewley for calculating LET spectra taking into account the elements ^1H, ^<12>C, ^<16>O only. Dose contributions to human body as calculated by Randolph due to ^1H, ^<12>C, ^<14>N, ^<16>O are respectively 69.5%, 6.5%, 1.1%, 22%. All other elements contribute only 0.8%.
日本放射線影響学会の論文