In contrast to SAR, the single aliquot regeneration and added (SARA) dose procedure corrects for any change in sensitivity during the first OSL measurement.
The SARA results are shown to be ∼10% older than those from SAR, confirming the geological age estimate and suggesting that SAR ages may underestimate older ages (larger doses), despite their good performance in the younger age range.
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.
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.
By testing the amount of carbon stored in an object, and comparing to the original amount of carbon Unfortunately, the believed amount of carbon present at the time of expiration is exactly that: a belief, an assumption, an estimate.
It is very difficult for scientists to know how much carbon would have originally been present; one of the ways in which they have tried to overcome this difficulty was through using carbon equilibrium.
Results from more southern latitudes have shown that dose estimates based on quartz OSL and the single aliquot regenerative (SAR) dose procedure may underestimate the age of MIS 5e deposits.
Here we use the same method to date well-described marine sediments, thought to have been deposited during the very beginning of the Eemian interglacial at ∼130 ka, and exposed in two sections on the river Sula in northern Russia.
They attempted to account for this by setting 1950 as a standard year for the ratio of C-12 to C-14, and measuring subsequent findings against that. Other times, the findings will differ slightly, at which point scientists apply so-called ‘correction tables’ to amend the results and eliminate discrepancies.Most concerning, though, is when the carbon dating directly opposes or contradicts other estimates.At this point, the carbon dating data is simply disregarded.Taken alone, however, the carbon dating is unreliable at best, and at worst, downright inaccurate. Why not post a comment to tell others / the manufacturer and our Editor what you think. Providing the content is approved, your comment will be on screen in less than 24 hours.Leaving comments on product information and articles can assist with future editorial and article content.