My current research spans basic radionuclide metrology, standards for nuclear medicine, and the chemistry of (reverse) micellar solutions.
In support of the Radioactivity Group's efforts in standard reference materials (SRM) development, international intercomparisons, and calibration services, my work in basic metrology centers primarily on methods involving liquid scintillation (LS) counting. I work on primary standardizations using efficiency tracing and triple-to-double coincidence ratio (TDCR) methods.
In support of our nuclear medicine projects, I maintain the Radioactivity Group's commercial ionization chambers (dose calibrators), monitoring long-term stability and determining calibration factors for different radionuclides or geometries. I perform similar work with an automatic NaI(Tl) gamma well counter. I also participate in research in quantitative molecular imaging involving NIST's clinical PET-CT scanner. It is the only scanner of its kind that is directly calibrated to a national standard for radioactivity.
My research on the chemistry of (reverse) micellar solutions is focused on understanding the solution properties that might impact LS measurements. I have performed numerous studies using dynamic light scattering, fluorescence and transmission spectroscopies, and developed a Compton spectrum quenching (CSQ) technique for the identification of micellar phase boundaries.