### Theoretical constraints on the precision and age range of rehydroxylation dating

Given this, I see no reason why radio-carbon dating cannot be used for in any radio-carbon age from about that time, even with very precise. Originally Answered: How was carbon dating shown to be an accurate . says uranium-thorium dating not only is more precise than carbon dating in some. A common misconception about radiocarbon dating is that it gives a precise before calibration, came back with an error bar of +/- about 60 radiocarbon years.

Because the radiocarbon to stable carbon ratio in the atmosphere has fluctuated over time, there are "wiggles" in the calibration curve. Thus it is possible in some instances for two samples from a few decades apart to have the same radiocarbon concentration today, and hence the same apparent radiocarbon age.

### Radiocarbon dating - Wikipedia

This happens whenever there is a wiggle in the curve at the time the samples died. This, in fact, is the most significant factor contributing to loss of precision in radiocarbon dates today.

However, this contribution is usually only a few decades. Radiocarbon and Biblical Chronology Radiocarbon dates are certainly not precise to within a year or two, but they are generally precise to within a few hundred years or better.

This means radiocarbon's precision is generally sufficient to choose between alternate chronologies which differ by a hundred years or more. Thus radiocarbon serves biblical chronology mainly by helping to eliminate large-scale biblical chronology errors arising out of misinterpretation of the biblical text or textual corruption.

For a good example of the role radiocarbon plays in biblical chronology see Is Bryant Wood's chronology of Jericho valid?

Once such large-scale errors have been eliminated the precision of biblical chronology rivals that of dendrochronology. However, a little more knowledge about the exact ins and outs of carbon dating reveals that perhaps it is not quite as fool-proof a process as we may have been led to believe.

## Is Carbon Dating Accurate?

What is Carbon Dating? At its most basic level, carbon dating is the method of determining the age of organic material by measuring the levels of carbon found in it. Specifically, there are two types of carbon found in organic materials: It is imperative to remember that the material must have been alive at one point to absorb the carbon, meaning that carbon dating of rocks or other inorganic objects is nothing more than inaccurate guesswork.

All living things absorb both types of carbon; but once it dies, it will stop absorbing. The C is a very stable element and will not change form after being absorbed; however, C is highly unstable and in fact will immediately begin changing after absorption. Specifically, each nucleus will lose an electron, a process which is referred to as decay. Half-life refers to the amount of time it takes for an object to lose exactly half of the amount of carbon or other element stored in it.

This half-life is very constant and will continue at the same rate forever. The half-life of carbon is 5, years, which means that it will take this amount of time for it to reduce from g of carbon to 50g — exactly half its original amount. Similarly, it will take another 5, years for the amount of carbon to drop to 25g, and so on and so forth.

In radiocarbon dating, for example, the limits to measurement precision are predominantly determined by a combination of counting statistics and sample mass.

The older a sample is, the less 14C it contains, and consequently precise measurements become increasingly difficult at timescales more than 50 ka roughly 8—9 half-lives. Rehydroxylation RHX dating developed from new insights [ 5 ] into the cause of long-term mass gain and expansion in bricks and tiles. A deeper understanding of these phenomena has only recently emerged as reviewed in [ 67 ].

Both effects are a consequence of recombination of the ceramic matrix with atmospheric moisture rehydroxylation. The method has since been successfully applied to a small number of samples of archaeological pottery [ 4 ], but experimental difficulties have been reported by other authors [ 9 — 11 ] in applying the method to archaeological material.

Consequently, one research priority is the development of appropriate chemical pre-treatment of archaeological material. Another important priority is determining the theoretical error limits of the technique, as well as an appropriate framework for combined measurement uncertainty. This would allow meaningful comparison between different studies. The aim of this paper is therefore to investigate the theoretical limits to rehydroxylation dating, as well as to quantify the combined measurement uncertainty associated with the technique.

When aluminium layer silicates are fired, structural water hydroxyl is lost from the molecular lattice, along with several forms of more weakly bound water adsorbed on the pores and mineral interlayers.