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Radiocarbon dating measures carbon-14 in material that was once part of a living organism. For wood, the result dates the growth of the sampled tree ring—not automatically the felling of the tree, the making of an object, or the construction of a building. A laboratory first reports a radiocarbon age; calibration is needed to estimate the sample’s calendar-age range.
What radiocarbon dating measures
Living things continually exchange carbon with their surroundings. When an organism dies—or plant material is otherwise cut off from the carbon cycle—it stops taking in new carbon. Its carbon-14 then declines through radioactive decay. A laboratory measures the remaining radiocarbon in a prepared sample and calculates a conventional radiocarbon age.
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That age is not itself a calendar date. Conventional radiocarbon ages use “BP,” meaning “before present,” with the reference point fixed at AD 1950. Because atmospheric radiocarbon levels have varied over time, a measured age cannot simply be read as a year on the calendar. Oxford’s explanation of radiocarbon results describes the distinction between the laboratory determination and calibrated calendar ranges.
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What a radiocarbon date on wood tells you
A wood result is tied to the growth of the ring or wood tissue that was sampled. It can establish when that part of the tree formed, subject to measurement and calibration uncertainty. It does not by itself establish when the tree was cut, when a wooden artifact was made or used, or when a building was erected.
Why the sampled ring matters
Wood near the trunk’s center formed earlier than wood near its outer edge. If an inner ring is sampled, its age may substantially predate the tree’s felling. The outermost growth is usually closer to the felling event, but it still does not prove that the timber was used immediately.
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Old or reused timber
Timber may have been stored, reused, or incorporated into a later structure. A date on that timber can therefore be older than the construction or use event an archaeologist wants to establish. The Czech Academy of Sciences states that “The result of radiocarbon dating is the time when the dated material was removed from the carbon cycle.” Its guidance also cautions that a result does not directly determine the production date of a wooden object or the construction date of a building: what a radiocarbon result means.
Choosing a useful wood sample
Sample choice is an archaeological judgment as well as a laboratory decision. A clearly identified piece from a secure context is generally more useful than a mixture of unidentified organic material. Choose material whose growth is plausibly close to the event being investigated, and interpret it alongside the object’s context and history. Oxford’s overview of radiocarbon dating discusses sample selection and the limits of what the result dates.
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Why radiocarbon dates need calibration
Atmospheric carbon-14 has not remained constant, so equal radiocarbon ages do not always correspond to equal calendar ages. Calibration compares a sample’s measured age and uncertainty with records from materials whose calendar ages are known independently. Tree rings are particularly important for calibrating terrestrial wood. The IntCal Working Group explains the role of calibration datasets at IntCal; as the group puts it, “Radiocarbon when used for dating purposes requires calibration against known-age material.”
Calibration produces a probability distribution across possible calendar ages rather than a guaranteed single year. Depending on the measurement and curve, the result may contain several separate intervals. Oxford’s published example of a determination of 1000±25 BP gives a 68% interval of cal AD 994–1037 and separate 95% intervals of cal AD 987–1047, 1088–1122, and 1138–1150. These are illustrative values from that laboratory, not a general promise of precision. See its calibration explanation and example result.
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Report the calibrated probability level and all relevant intervals rather than compressing them into one approximate year. A range expresses uncertainty; it is not evidence that the sample belongs to every year in that range.
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How reservoir effects change the calibration choice
Calibration must match the carbon source represented by the sample. Terrestrial plants generally draw carbon from the atmosphere, while marine and freshwater organisms can receive carbon through food webs whose radiocarbon content differs from the atmosphere. A result from such a pathway can appear older or otherwise misleading if calibrated as though it were ordinary terrestrial material.
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Historic England’s cited guidance distinguishes terrestrial samples (IntCal20), marine samples (Marine20 with an appropriate local ΔR correction), freshwater samples (IntCal20 with an appropriate local offset), and material with mixed carbon sources, which may require mixed calibration. The page is IntCal20-era guidance; curve versions, software, geography, and local offsets matter for an actual sample. Consult the relevant specialist evidence rather than applying a curve or correction by default: Historic England’s radiocarbon guidance.
Stable-isotope information and archaeological context can help identify a possible reservoir issue, but they do not replace appropriate curve and offset selection.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Contamination, pretreatment, and sample limits
Carbon is widespread, so material from another age can affect a sample. Soil-derived carbon or conservation treatments may introduce younger or older carbon. Laboratories use chemical pretreatment to remove unwanted material, selecting methods for the sample type and its preservation. Pretreatment reduces contamination risk but cannot be assumed to eliminate every problem.
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Because preparation consumes sample material, testing an artifact requires a decision about whether destructive sampling is justified and whether enough suitable material is available. The laboratory’s method and sample requirements vary; the Czech Academy of Sciences describes the destructive nature of preparation in its method overview. Oxford also outlines pretreatment methods; specific protocols should be confirmed with the laboratory handling the material.
Quick Recap
How to read a radiocarbon result responsibly
- Identify what was sampled: specify the material and, for wood, the sampled ring or part of the timber when known.
- Separate the dated event from the archaeological question: a result dates the sampled carbon’s removal from the carbon cycle, not automatically an artifact’s manufacture, use, or a building’s construction.
- Check the context and history: consider old inner wood, reuse, storage, preservation, and possible contamination.
- Match the calibration to the carbon source: terrestrial, marine, freshwater, or mixed-source material may require different curves or corrections.
- Keep the uncertainty intact: report the calibrated probability level and any distinct calendar intervals rather than choosing a single year.
- Confirm sampling feasibility: ask the receiving laboratory about sample quantity, pretreatment, conservation materials, and the consequences of destructive preparation.
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