“…For those fission products not removed by melt refining (noble metals), inelting of the charge and casting of a homogeneous ingot effects the summation (2 6.:W4) specified in Equation (2). Hence, in the case of ruthenium,* a typical noble metal, the concentration of fission product ruthenium in the ingot, Ruj^, is proportional to the concentration of fission product ruthenium in the charge:…”