We are seeking a Postdoctoral Researcher to develop resonance ionization mass spectrometry (RIMS) including commissioning a new RIMS instrument for nuclear forensics, cosmochemistry, and earth sciences. You will work with a group of geoscientists, radiochemists, and other scientists on method development, procedure optimization, sample analysis, and data interpretation aimed at understanding detection, analysis, and isotope systematics. You will participate in all phases of research from project development through implementation, data analysis and interpretation, and documentation and presentation of results. You will also collaborate with a larger group of researchers using a range of state-of-the-art mass spectrometers (noble gas mass spectrometry, ICPMS) and microanalytical instruments (SIMS, EPMA) in related application areas. This position is in the Trace Isotope and Element Signatures Group within the Nuclear and Chemical Sciences Division. This position requires full-time on-site presence due to the nature of the work. You will  Develop and apply new methods of isotopic and elemental analysis. Propose and develop new applications for RIMS; for example, laser spectroscopy, environmental chemistry, and isotope geology. Conduct both experimental and routine analyses of a variety of natural and manufactured materials to demonstrate existing and new capabilities; communicate results in oral and written reports. Collaborate with scientists and technical personnel to carry out RIMS analysis and data interpretation for Earth science, nuclear nonproliferation, and nuclear forensics applications. Participate in development of research plans and proposals. Publish research results in peer-reviewed scientific or technical journals. Present results at external conferences, seminars, and/or technical meetings. Perform other duties as assigned.