This is the second volume in a series of critical reviews of the chemical thermodynamic data of those elements of particular importance in the safety assessment modeling of high-level radioactive waste storage and disposal facilities. The objective of these reviews is to provide a set of reliable thermodynamic data that can be used to describe the behaviour of these elements under conditions relevant for radioactive waste disposal systems and the geochemical environments. The present volume is a review of experimental data reported in the literature for americium. On a few occasions, where no data existed, comparisons and estimates were made based on experimental data on analog lanthanide elements. The basic philosophy was to develop a minimum set of solid phases and solution species of americium that would fit all experimental data being reviewed.

Utility theory provides the means for characterizing a decision maker's preferences over the range of some attribute. The ideas behind utility theory have been extended to decision making problems in which more than one attribute is used to characterize possible alternatives, and this extension is termed multi-attribute utility theory. A multi-attribute utility assessment computer program is developed which can handle consequences composed of two attributes. It handles four particular cases of utility independence, utility independence in one direction, and no independence properties. A two-attribute consequence space was chosen particularly for the ability to represent the multi-attribute utility function graphically in three dimensions, from one of eight possible viewpoints. The utilities of two Air Force mission planners were assessed to determine the feasibility of using probability of arrival and probability of target destruction as factors for mission success. Based on the results, it appears as though multiattribute utility theory would be a definite help to Air Force mission planning. (Theses).