All Stories

  1. Radiocarbon sample processing

    Article • Radiocarbon, July 2016, Cambridge University Press

    Dr. Guaciara M Santos

  2. From radiocarbon analysis to interpretation: A comment on “Phytolith Radiocarbon Dating in Archaeological and Paleoecological Research: A Case Study of Phytoliths from Modern Neotropical Plants and a Review of the Previous Dating Evidence”, Journal of ...

    Article • Journal of Archaeological Science, July 2016, Elsevier

    Dr. Guaciara M Santos

  3. Direct uptake of organically derived carbon by grass roots and allocation in leaves and phytoliths: 13C labeling evidence

    Article • Biogeosciences, March 2016, Copernicus GmbH

    Dr. Guaciara M Santos

  4. Unambiguous evidence of old soil carbon in grass biosilica particles

    Article • Biogeosciences, March 2016, Copernicus GmbH

    Dr. Guaciara M Santos, Franz Badeck

  5. A comparison of U/Th and rapid-screen 14 C dates from Line Island fossil corals

    Article • Geochemistry Geophysics Geosystems, March 2016, American Geophysical Union (AGU)

    Dr. Guaciara M Santos, Cheng Hai

  6. Annual nature of the growth rings of Araucaria araucana confirmed by radiocarbon analysis

    Article • Quaternary Geochronology, October 2015, Elsevier

    Dr. Guaciara M Santos

  7. Radiocarbon measurements at LAC-UFF: Recent performance

    Article • Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms, October 2015, Elsevier

    Dr. Guaciara M Santos, Dr Kita D Macario

  8. Advances in the graphitization protocol at the Radiocarbon Laboratory of the Universidade Federal Fluminense (LAC-UFF) in Brazil

    Article • Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms, October 2015, Elsevier

    Dr. Guaciara M Santos, Dr Kita D Macario

  9. Plant growth conditions alter phytolith carbon

    Article • Frontiers in Plant Science, September 2015, Frontiers

    Dr. Guaciara M Santos

  10. Improved radiocarbon analyses of modern human hair to determine the year-of-death by cross-flow nanofiltered amino acids: common contaminants, implications for isotopic analysis, and recommendations

    Article • Rapid Communications in Mass Spectrometry, August 2015, Wiley

    Dr. Guaciara M Santos

  11. Annual growth rings in a sample of Paraná pine (Araucaria angustifolia): Toward improving the 14C calibration curve for the Southern Hemisphere

    Article • Quaternary Geochronology, February 2015, Elsevier

    Dr. Guaciara M Santos

  12. Matching Dendrochronological Dates with the Southern Hemisphere 14C Bomb Curve to Confirm Annual Tree Rings in Pseudolmedia rigida from Bolivia

    Article • Radiocarbon, January 2015, Cambridge University Press

    Dr. Guaciara M Santos

  13. Blank Corrections for Ramped Pyrolysis Radiocarbon Dating of Sedimentary and Soil Organic Carbon

    Article • Analytical Chemistry, December 2014, American Chemical Society (ACS)

    Dr. Guaciara M Santos

  14. Understanding Holocene variations in the vegetation of Sao Joao River basin, southeastern coast of Brazil, using phytolith and carbon isotopic analyses

    Article • Palaeogeography Palaeoclimatology Palaeoecology, December 2014, Elsevier

    Dr. Guaciara M Santos, Dr Kita D Macario

  15. Rapid sample preparation of dissolved inorganic carbon in natural waters using a headspace-extraction approach for radiocarbon analysis by accelerator mass spectrometry

    Article • Limnology and Oceanography Methods, April 2014, American Society of Limnology and Oceanography, Inc.

    Dr. Guaciara M Santos

  16. Age of riverine carbon suggests rapid export of terrestrial primary production in tropics

    Article • Geophysical Research Letters, November 2013, American Geophysical Union (AGU)

    Dr. Guaciara M Santos

  17. Towards producing pure phytolith concentrates from plants that are suitable for carbon isotopic analysis

    Article • Review of Palaeobotany and Palynology, October 2013, Elsevier

    Dr. Guaciara M Santos

  18. Changes in Holocene tree cover density in Cabo Frio (Rio de Janeiro, Brazil): Evidence from soil phytolith assemblages

    Article • Quaternary International, February 2013, Elsevier

    Dr. Guaciara M Santos

  19. Behavioral Variability in ABA Chemical Pretreatment Close to the 14C Age Limit

    Article • Radiocarbon, January 2013, Cambridge University Press

    Dr. Guaciara M Santos

  20. Re-anchoring the late Pleistocene tephrochronology of New Zealand based on concordant radiocarbon ages and combined 238U/230Th disequilibrium and (U–Th)/He zircon ages

    Article • Earth and Planetary Science Letters, October 2012, Elsevier

    Dr. Guaciara M Santos

  21. Method development for 234U and 230Th determination and application to fossil deep-water coral and authigenic carbonate dating from the Campos Basin - Brazil

    Article • Journal of the Brazilian Chemical Society, March 2012, FapUNIFESP (SciELO)

    Dr. Guaciara M Santos

  22. Beyond archaeology: 14C-AMS and the global carbon cycle

    Article • January 2012, American Institute of Physics

    Dr. Guaciara M Santos

  23. Δ14C and Δ13C of Seawater DIC as Tracers of Coastal Upwelling: A 5-Year Time Series from Southern California

    Article • Radiocarbon, January 2011, Cambridge University Press

    Dr. Guaciara M Santos

  24. HPLC Purification of Higher Plant-Dervied Lignin Phenols for Compound Specific Radiocarbon Analysis

    Article • Analytical Chemistry, November 2010, American Chemical Society (ACS)

    Dr. Guaciara M Santos

  25. Recent (<4 year old) leaf litter is not a major source of microbial carbon in a temperate forest mineral soil

    Article • Soil Biology and Biochemistry, July 2010, Elsevier

    Dr. Guaciara M Santos

  26. The Phytolith 14C Puzzle: A Tale of Background Determinations and Accuracy Tests

    Article • Radiocarbon, January 2010, Cambridge University Press

    Dr. Guaciara M Santos

  27. Carbon Isotope Measurements of Surface Seawater from a Time-Series Site Off Southern California

    Article • Radiocarbon, January 2010, Cambridge University Press

    Dr. Guaciara M Santos

  28. Blank Assessment for Ultra-Small Radiocarbon Samples: Chemical Extraction and Separation Versus AMS

    Article • Radiocarbon, January 2010, Cambridge University Press

    Dr. Guaciara M Santos

  29. Compound-Specific Radiocarbon Analyses of Phospholipid Fatty Acids and N-Alkanes in Ocean Sediments

    Article • Radiocarbon, January 2010, Cambridge University Press

    Dr. Guaciara M Santos

  30. The Keck Carbon Cycle AMS Laboratory, University of California, Irvine: Status Report

    Article • Radiocarbon, January 2010, Cambridge University Press

    Dr. Guaciara M Santos

  31. Comment on Atmospheric carbon isotope signatures in phytolith occluded carbon, Carter, J.A., Quaternary International, this volume

    Article • Quaternary International, January 2009, Elsevier

    Dr. Guaciara M Santos

  32. Life with MC-SNICS. Part II: Further ion source development at the Keck carbon cycle AMS facility

    Article • Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms, June 2007, Elsevier

    Dr. Guaciara M Santos

  33. Cs Feed Tests and Emittance Measurements on a Modified MC-SNICS Ion Source for Radiocarbon AMS

    Article • Radiocarbon, January 2007, Cambridge University Press

    Dr. Guaciara M Santos

  34. 234U and 230Th determination by FIA-ICP-MS and application to uranium-series disequilibrium in marine samples

    Article • Journal of Environmental Radioactivity, January 2006, Elsevier

    Dr. Guaciara M Santos

  35. The Keck Carbon Cycle AMS Laboratory, University of California, Irvine: Initial Operation and a Background Surprise

    Article • Radiocarbon, January 2004, Cambridge University Press

    Dr. Guaciara M Santos

  36. Variability of Monthly Radiocarbon During the 1760S in Corals from the Galapagos Islands

    Article • Radiocarbon, January 2004, Cambridge University Press

    Dr. Guaciara M Santos