Accelerator mass spectrometry radiocarbon dating

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Method synopsis

Measurement of radiocarbon content in bulk sediments and density fractions using accelerator mass spectrometry after acid fumigation pretreatment to remove inorganic carbon.

Synthesized from method descriptions across 8 papers using this protocol.

Procedure from a recent peer-reviewed implementation

Steps below were extracted from the most recent peer-reviewed implementation of this protocol in the corpus — Shale as a Source of Organic Carbon in Floodplain Sediments of a Mountainous Watershed (2020), JGR Biogeosciences. Implementations in other papers (listed below) may differ.

1. Radiocarbon sample preparation
   All samples were graphitized in the Houghton Carbon, Water and Soils Lab (USDA-FS Northern Research Station) according to Vogel et al. (1987). Bulk sediment and sediment HF were treated by acid fumigation with HCl vapors for 48 hr in a vacuum desiccator, then dried at 60 °C for 24 hr, and stored in a vacuum desiccator in order to remove inorganic carbon prior to radiocarbon analysis. Samples were graphitized, and analyzed for radiocarbon using an accelerator mass spectrometer.
   Quantities: 48 hr HCl vapor treatment, 60 °C drying temperature, 24 hr drying timeDuration: 48 hr acid fumigation, 24 hr dryingConditions: Vacuum desiccator, 60 °C temperature
   Equipment: vacuum desiccator, accelerator mass spectrometer

Typical Equipment

• vacuum desiccator
• accelerator mass spectrometer

Output Measurements

• Δ¹⁴C values
• conventional radiocarbon age
• fraction modern

Papers Using This Protocol (8)

Species Studied With This Protocol

Places Where Used