A method for estimation of isotope yield in a thick target under photonuclear production

摘要

A model for analytical description of high-energy Bremsstrahlung radiation and activation of the thick production target is presented. Simple formulas including limited number of testable radiation parameters and the excitation function in the Breit-Wigner form are derived for determining effective cross-section of photonuclear reaction and isotope yield. As an illustration, we consider the ~(48)Ti(γ, p)~(47)Sc, ~(68)Zn(γ, p)~(67)Cu, ~(100)Mo(γ, n)~(99)Mo, ~(112)Sn(γ, p)~(111)In, and ~(193)Ir(γ, n)~(192)Ir reactions that can be used for production of some medical isotopes. It has been shown that the values of the proportionality factor between peak and effective cross-sections for the reactions under study (in the range of target atomic number Z～ 20-80) are adjacent for a specified endpoint energy of Bremsstrahlung spectrum in the range of practical interest 40-100 MeV. The obtained data on isotope yield are compared with experimental and simulation results.