Senior Chemist (Radiochemistry), Advanced

SRNL seeks a Senior Scientist & Engineer with broad and deep expertise in radiochemistry, environmental chemistry, materials science, and advanced X ray and spectroscopic characterization. This role provides scientific leadership across federal mission spaces including nuclear materials processing, radiological environmental science, nuclear fuel cycle R&D, waste form development, safeguards and nonproliferation, analytical method development, and emerging signature science. The ideal candidate will have a strong background in interfacial chemistry, contaminant speciation, materials degradation mechanisms, ion exchange and separation science, cementitious and engineered waste materials, and cutting edge synchrotron and benchtop X ray methods. This position is designed for a senior technical leader who integrates fundamental chemistry, advanced measurement science, and applied systems understanding to generate new knowledge, test hypotheses, develop technologies, guide national laboratory programs, and address complex radiochemical and materials challenges across multiple federal sponsors. ### Responsibilities **Scientific Leadership & Technical Innovation** - Lead research in radiochemistry, geochemistry, and materials chemistry, emphasizing contaminant fate, transport, and chemical transformations in complex aqueous, geological, and engineered systems. - Design and execute studies integrating spectroscopy, scattering, microscopy, thermodynamic modeling, and complementary analyses to resolve mechanisms of radionuclide behavior, coordination environments, redox chemistry, and solid-phase evolution. - Advance separation know-how through ion exchange, sorbent, hybrid resin, and novel material science methods, including mechanistic studies and performance prediction for diverse contaminants. - Lead research on cementitious and mineral-based materials including hydration, aging, redox dynamics, contaminant retention, and optimization of contaminant loading and leach behavior. - Investigate and develop surface coatings, fixatives, and engineered barrier materials, characterizing physicochemical interactions at microscale and macroscale. **Advanced Measurement Science** - Serve as a laboratory authority in synchrotron-based X-ray absorption, emission, fluorescence, and scattering techniques, leading proposal development and multi-institutional beamline campaigns at APS, SSRL, and international facilities. - Apply benchtop XES, XRF, XAS, XRD, SEM/EDS, and associated methods to characterize materials under radiological and non-radiological conditions. - Develop new analytical workflows for speciation analysis, microstructural evaluation, redox state quantification, and chemical imaging of complex systems. - Integrate experimental techniques with transport modeling, thermodynamic calculations (PHREEQC, GWB, GEMS), and data analytics (Python) to inform mechanistic and predictive understanding. **Program Development Across Federal Mission Areas** - Lead and support R&D portfolios for programs such as: • DOE Office of Nuclear Energy (NE) – fuel cycle chemistry, waste forms, & separations • DOE Office of Science – BES/chemical sciences/ BER/earth systems processes • NNSA/NA 22 – signature science, materials characterization, & nuclear security • Interagency programs and international collaborations in nuclear materials science • DOE EM (as one of several areas), including groundwater investigation, environmental chemistry, and materials degradation science **Collaboration & Scientific Community Leadership** - Build national and international research networks across national laboratories, universities, and industry partners. - Represent SRNL through invited talks, conference session organization, editorial roles, and participation in user committees at large scientific facilities (e.g., APS UEC). - Mentor junior scientists, postdocs, and interns; guide development of the next-generation measurement and materials science workforce. **Core C…