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Denis E. Bergeron

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.


Non-fuel Antineutrino Contributions in the High Flux Isotope Reactor

PROSPECT COLLABORATION, Jerome J. LaRosa, Hans P. Mumm, Svetlana Nour, Mark A. Tyra, Denis E. Bergeron
Reactor neutrino experiments have seen major improvements in precision in recent years. With the experimental uncertainties starting to surpass those from

Primary standardization of Ra-224 activity by liquid scintillation counting

Denis E. Bergeron, Jeffrey T. Cessna, Ryan P. Fitzgerald, Brian E. Zimmerman, Lizbeth Laureano-Perez, Ronald Colle, Leticia S. Pibida, Elisa Napoli
A standard for 224Ra activity has been developed, based on triple-to-double coincidence ratio (TDCR) liquid scintillation (LS) counting. The standard was

Standardization of I-124 by three liquid scintillation-based methods

Denis E. Bergeron, Leticia S. Pibida, Brian E. Zimmerman, Jeffrey T. Cessna, Ryan P. Fitzgerald
A solution of 124I was standardized for activity by 4πβ(LS)-γ(NaI) live-timed anticoincidence (LTAC) counting, with confirmatory measurements by triple-to
Created October 3, 2019