Calculation of Cobalt and Gold Dosimetry Cross Sections from 1 to 50 MeV

Abstract

Dosimetry cross sections for cobalt and gold are evaluated by the theoretical model based method to 50 MeV for the application to accelerator-based high energy neutron fields. We employed a model code system, SINCROS-II whose main part is a modified version of GNASH. Appropriate model parameters were selected or determined by fitting the cross sections to the available data mainly below 20 MeV. The calculations were extended to 50 MeV using these parameters. For the cobalt, the activation dosimetry reactions (n,2n), (n,3n), (n,4n), (n,p), (n,α) and (n,α2n), and a-production reaction (n,He) and for the gold, (n,2n), (n,3n), (n,4n) and (n,p), (n,ot) = (n,He) cross sections were calculated. Consistency of the these calculated cross sections is discussed by comparing with a few available experimental data above 20 MeV. Particular emphasis is placed on the consistency of the cobalt cross sections. The reaction 59Co(n,α2n) can be a new promising dosimetry one between 30 and 50 MeV.