Utilizing distinct neutron spectra and a system of equations to differentiate competing reactions in activation analysis

In activation analysis, the continuous neutron spectrum produced in a nucle ar reactor can be both beneficial and detrimental. A continuous spectrum al lows for activation of particular elements by using any number of neutron e nergies. However, upper threshold energies exist for most elements where re actions other than an (n, gamma) absorption will occur. In this situation, two different parent nuclides can be activated to the same product, which c reates a problem in performing a quantitative analysis of one or the other nuclide. A methodology is presented where a system of equations is used to solve for the quantities of both nuclides by using different irradiation po rts, and using specific neutron filters to "customize" the neutron flux.