For distinguished research on the air/surface exchange of atmospheric trace gases and particles and their interactions with the Earth's biogeochemical cycles, and for pioneering developments in atmospheric sampling methodologies with special emphasis on the global mercury cycle.
For pioneering research in ecosystem theory, ecological modeling, error analysis, hierarchy theory, and landscape ecology and for the development of basic applications in risk assessment and regional environmental analysis.
For distinguished research in the field of risk assessment, including pharmacokinetic and pharmacodynamic models, interspecies extrapolation, and human exposure to dioxin and other background contaminants, and for significant contributions to environmental policy through pioneering investigations of the effectiveness of remediation technologies and through service on national and international advisory panels and boards
For basic studies in the fracture of and toughening mechanisms in ceramics and ceramic composites, in the establishment of the relationships between microstructure and composition and mechanical behavior, and in the development of advanced ceramic materials.
For advances in neutron and gamma-ray dosimetry, the transport of electricity through gases, and the development of laser-based one-atom detection with applications in nuclear physics, solar neutrino research, and oceanic, geologic, and environmental research
For research on the processes involved in the induction of mutations, elucidating the roles and sequences of DNA repair and replication in converting radiation or chemical damage into mutations, and for contributions to the understanding of biological control mechanisms at the cellular level