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Isotope Sciences Program

Key Staff

Gert Patello

Gert Patello

is the Program Manager for the PNNL Isotope Program. She has been managing projects and staff related to isotope research for 6 years. She received her Ph.D. in Ceramics from Alfred University.

David Blanchard

David Blanchard

is a Senior Research Scientist and Lead of the Irradiated Materials Team. He has been conducting Radiochemical Separations and Surface Science R&D for over 20 years. He received his Ph.D. in Physical Chemistry from the University of Washington.


Garrett Brown

Garrett Brown

is a Senior Research Scientist who specializes in the industrial application of short-lived radionuclide generators. He received his Ph.D. in Chemistry from the University of Colorado, Boulder.

Larry Greenwood

Larry Greenwood

is a Laboratory Fellow who specializes in Reactor Dosimetry and Radiation Damage Calculations for Engineering Materials and has managed isotope production projects. He received his Ph.D. in Nuclear Physics from the University of Houston.


Eric Hoppe

Eric Hoppe

is a Senior Research Scientist in the Radiation Imaging and Material Science Group. Eric has been involved in very difficult chemical separations and purifications including those that pertain to high radiopurity low background materials and their assay for over three decades. He received his degree in Analytical Chemistry from Colorado State University.

Gregg Lumetta

Gregg Lumetta

is a Senior Research Scientist and Lead of the Actinide Science Team. He specializes in Solvent Extraction and Ion-Exchange, Characterization of Metal Complexes, and Reaction Mechanisms by Spectroscopy. He received his Ph.D. in Inorganic Chemistry from the University of Missouri at St. Louis.


Andrey Mozhayev

Andrey V. Mozhayev

is a specialist with twenty years of experience in the development and application of gamma and neutron radiation-based measurement techniques in various fields: nuclear material control and accounting, waste characterization, criticality and safety basis, as well as radiation safety and dosimetry. Andrey received his M.S. in Nuclear Engineering from the Institute of Nuclear Power Engineering, Obninsk, Russia.

Matt O'Hara

Matt O'Hara

is a Senior Research Scientist who specializes in the development of Radiochemical Separations Methods and the design and engineering of Automated Systems for Remote Radiochemical Sensing, Radiochemical Separations, Radioanalytical Methods, and Isotope Production. He has developed processes for Y-90, Bi-213, Zr-89, and At-211. He received his B.A. in Chemistry and Environmental Geology from the University of Montana, Missoula and his M.S. in Business Administration from Washington State University.


Brian Rapko

Brian Rapko

is a Senior Research Scientist who has been involved in both basic and applied work in Radionuclide Separations for the past 16 years. He received his Ph.D. in Inorganic Chemistry from the University of Oregon.

Chuck Soderquist

Chuck Soderquist

is a Radiochemist who specializes in Radiochemical Separations and Radioanalytical Chemistry. He received his M.S. in Chemistry from Central Washington University.


Rick Wittman

Rick Wittman

is a Research Scientist who currently works on computer modeling of isotope production and dosimetry. He received his Ph.D. in Theoretical Nuclear Physics at the Rensselaer Polytechnic Institute.

Isotope Program

Isotopes