The resulting data, in the form of a calibration curve, is now used to convert a given measurement of radiocarbon in a sample into an estimate of the sample's calendar age. Other corrections must be made to account for the proportion of 14 C in different types of organisms fractionationand the varying levels of 14 C throughout the biosphere reservoir effects.
Additional complications come from the burning of fossil fuels such as coal and oil, and from the above-ground nuclear tests done in the s and s. Because the time it takes to convert biological materials to fossil fuels is substantially longer than the time it takes for its 14 C to decay below detectable levels, fossil fuels contain almost no 14 Cand as a result there was a noticeable drop in the proportion of 14 C in the atmosphere beginning in the late 19th century.
Conversely, nuclear testing increased the amount of 14 C in the atmosphere, which attained a maximum in of almost twice what it had been before the testing began.
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Therefore, you would not want to use it on a gun stock that was going to be put back on the iron barrel after treatments, because the PEG would or could then cause the iron to start corroding. It usually a simple matter to rig up any number of ways to treat the smaller waterlogged wood artifacts in the laboratory.
Small vats metal or glass are readily available and they can be placed in a thermostatically controlled oven to maintain the correct temperature and only a small amount of PEG is required. In contrast, when large pieces of wood are treated, there is a substantial investment in PEG sometimes measured in the tons and a substantial vat has to be constructed that can be heated and the contents circulated with pumps.
It is a major investment in both equipment and chemicals when a laboratory elects to get in the business of conserving large wood pieces. Quite often this capacity is the most costly investment of the laboratory. In addition, between treatments, the PEG has to be kept stored.
As am example of cost, if a single piece of wood 6 feet long and 1 foot wide was treated.