Uranium Daughter Growth Must Not BenNeglected When Adjusting PlutoniumnMaterials for Assay and Isotopic Contents

摘要

Relationships are provided to compute the decreasing plutonium content and changing isotopic distribution of plutonium materials for the radioac¬tive decay of 288Pu, 289Pu, 240Pu, and 242Pu to long-lived uranium daughters and of 241Pu to 241Am. This computation is important to the use of plutonium reference materials to calibrate destructive and nondestructive methods for assay and isotopic measurements, as well as to accountability inventory calculations.