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Staff & Research

Mark Kurz

Mark Kurz, (current director of NOSAMS) is a geochemist whose research activities include: isotope geochemistry of mantle derived rocks and minerals, evolution of oceanic volcanoes, cosmic-ray produced nuclides in rocks and their application to geochronology, and evolution of the mantle-continent-atmosphere system.

Roberta Hansman

Roberta Hansman, staff chemist and director of the sample preparation laboratory, is interested in the marine carbon cycle and using radiocarbon to study water column biogeochemistry and the role of microbes in carbon turnover in the deep ocean.

Mark L. Roberts

Mark Roberts, staff physicist, is responsible for operation and continued development of both the CFAMS and US-AMS systems at NOSAMS. Research interests include AMS technology, development of gas-accepting ion sources and interfaces, and initiatives to re-determine the 14C half-life.

NOSAMS Staff Publications

Search the NOSAMS Research Library to find publications by NOSAMS staff .

Latest Publications by NOSAMS staff

  • Jessie K. Pearl, Kevin J. Anchukaitis, Jeffrey P. Donnelly, Charlotte Pearson, Neil Pederson, Mary C. Lardie Gaylord, Ann P. McNichol, (2020) Edward R. Cook, George L. Zimmermann, A late Holocene subfossil Atlantic white cedar tree-ring chronology from the northeastern United States, Quaternary Science Reviews, Volume 228, 106104, ISSN 0277-3791, /j.quascirev.2019.106104.


  • Mark Roberts, Kathyrn Elder, William Jenkins, Al Gagnon, Li Xu, Joshua Hlavenka, & Brett Longworth (2019). 14C Blank Corrections for 25–100 μg Samples at the National Ocean Sciences AMS Laboratory. Radiocarbon, 61(5), 1403-1411. doi:10.1017/RDC.2019.74


  • Kathryn Elder, Mark Roberts, Tess Walther, & Li Xu (2019). Single step Production of graphite from organic Samples for Radiocarbon Measurements. Radiocarbon, 61(6), 1843-1854. doi:10.1017/RDC.2019.136


  • Joshua D. Hlavenka, Henry Abrams, Mark L. Roberts, Brett E. Longworth, Stewart Fallon, (2019) Improved C− efficiency and ion beam currents by modifying SNICS cathode material, Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Volume 439, Pages 90-93, ISSN 0168-583X,


  • Mary C. Lardie Gaylord, Brett E. Longworth, Keelan Murphy, Caroline Cobb, Ann P. McNichol, (2019), Annual radiocarbon measurements in a century-old European beech tree (Fagus sylvatica) from coastal northeastern North America, Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Volume 456, Pages 264-270, ISSN 0168-583X,


  • Kelsey L. Rogers, Sara H. Bosman, Mary Lardie-Gaylord, Ann McNichol, Brad E. Rosenheim, J. P. Montoya, Jeffery P. Chanton, (2019) ?Petrocarbon evolution: Ramped pyrolysis/oxidation and isotopic studies of contaminated oil sediments from the Deepwater Horizon oil spill in the Gulf of Mexico?, PLOS ONE, vol. 14, no. 2, p. e0212433


  • Huei-Ting Lin, Daniel J. Repeta, Li Xu, Michael S. Rappé, (2019) Dissolved organic carbon in basalt-hosted deep subseafloor fluids of the Juan de Fuca Ridge flank, Earth and Planetary Science Letters, Volume 513, Pages 156-165, ISSN 0012-821X,


  • Rui Bao, Ann McNichol, Jordon Hemingway, Mary Lardie Gaylord, & Timothy Eglinton (2019). Influence of Different Acid Treatments on the Radiocarbon Content Spectrum of Sedimentary Organic Matter Determined by RPO/Accelerator Mass Spectrometry. Radiocarbon, 61(2), 395-413. doi:10.1017/RDC.2018.125