Radiocarbon Dating
Also known as: ¹⁴C dating, Carbon-14 dating
Radiocarbon dating is a radiometric technique that determines the age of organic materials by measuring the radioactive decay of ¹⁴C (carbon-14), a rare isotope produced in the atmosphere by cosmic ray interactions. Developed by Willard Libby in 1949, radiocarbon dating became a foundational method in archaeology, paleoclimate studies, and geology, enabling dating of organic materials from the past ~50,000 years with typical precision of ±50–100 years.
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When to use it
Use radiocarbon dating for organic materials younger than ~50 ka, particularly in archaeology, paleoclimate (lake cores, ice cores), and recent geological contexts. For older materials (>50 ka), use other radiometric methods (K-Ar, U-Th, Ar-Ar). Combine radiocarbon with other dating methods (paleomagnetic, stratigraphic) for robust chronologies.
Strengths & limitations
- Precise and accurate: typical precision ±50–100 years for samples 1000–10000 years old
- Non-destructive for some measurement techniques (AMS requires mg quantities)
- Applicable to diverse materials: bone, wood, shell, peat, textiles, tooth enamel
- Direct dating of archaeological and paleoclimate samples without relying on correlation with known chronologies
- Age limit: unreliable for samples >50 ka (remaining ¹⁴C approaches background noise)
- Reservoir effects: marine organisms incorporate ¹⁴C from old dissolved carbon, requiring correction (typically several hundred years)
- Contamination: even minute contamination with modern carbon or old carbon significantly shifts ages
- Calibration uncertainty: flat sections in calibration curves introduce age uncertainty despite precise measurements
Frequently asked
What is the '¹⁴C plateau' and how does it complicate dating?
Between ~1000–1200 cal BC (or ~3000–3200 cal BP), the atmospheric ¹⁴C concentration was relatively stable, producing a 'plateau' in the calibration curve. A radiocarbon measurement in this age range could correspond to multiple calendar ages. Bayesian modeling combining radiocarbon with other stratigraphic information helps resolve ambiguity.
What is reservoir effect and which samples are affected?
Marine organisms incorporate ¹⁴C from deep ocean water, which is depleted in ¹⁴C compared to the atmosphere due to long residence times. Shells and bone from marine animals are typically 400–500 years 'older' than their actual age. Lake samples can also show reservoir effects if the lake basin contains old carbon sources. Freshwater samples may also show hard-water effects from dissolved limestone.
How precise can radiocarbon dating be?
Measurement precision (1-sigma standard error) is typically ±30–50 years for well-preserved samples. However, calibration uncertainty and potential contamination can increase effective uncertainty to ±100–200 years, particularly for younger samples where relative uncertainty is larger.
Can radiocarbon dating distinguish between samples of the same radiocarbon age?
No. Radiocarbon measures only the ¹⁴C/¹²C ratio and elapsed time since ¹⁴C uptake. If two samples have identical ¹⁴C content, radiocarbon cannot distinguish them. Other isotopes (δ¹³C, δ¹⁸O) or independent dating methods (paleomagnetic, stratigraphic) must be used for differentiation.
Sources
How to cite this page
ScholarGate. (2026, June 3). Radiocarbon Dating. ScholarGate. https://scholargate.app/en/geophysics/radiocarbon-dating
Which method?
Set this method beside its closest kin and read them side by side — the library lays the books on the table; the choice is yours.
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