By Gronwall T.H.
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The direct fission yields for the stable isotopes are fairly small. Thus, in some cases there exists an appreciable time delay from fission to the generation of the stable xenon and krypton isotopes (this may be ignored for the very short half-life ptients). Note there is also some linkage between decay chains through neutron absorption. These factors (absorption, production from fission, and decay) and their differing effects for each isotope result in considerable information concerning the spent fuel being contained in the relative amounts of various xenon and krypton isotopes.
He proposed using three isotopic ratios: ‘Kr/83Kr, *32Xe/13*Xe,and l~d/143Nd. These ratios could be used to obtain fairly accurate bumup, but required a significant amount of knowledge about the spent fuel including the reactor type and beginning-of-life (130L) isotopics. A comprehensive study of isotope correlation techniques (ICTS) was performed by L. Koch et al. 19-= These studies focused on determining spent fuel parameters using heavy metal and fission product correlations derived from measured values.
The technique developed here was applied to solve two separate but similar problems: the Inverse Problem and the Forward Problem. The lhverse Problem occurs when an inspector takes an air sample horn on-stack at a reprocessing facility and, without any other previous information, analyzes it to determine the fuel type, burnup, and other properties of the spent fiel. The Forward Problem is slightly simpler in that the inspector assumes that he knows the fuel type being reprocessed (perhaps declared by an operator or observed by the inspector) and simply uses the on-stack air sample to determine fuel burnup and isotopic composition.