Surface exposure cosmogenic nuclide dating

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An important example of this situation is that of the production rate scaling factors.

In a landmark paper, Lal (1991) presented a method to calculate cosmogenic nuclide production rates as a function of latitude and elevation.

TCN dating is no longer a specialized tool used by a small group of experienced users, but has found an ever growing base of users who are not necessarily familiar with all the details of the method. On the one hand, a better understanding of cosmogenic nuclide production systematics has improved the accuracy of TCN dating.

But on the other hand, many users of the method may be less familiar with its intricacies than was the case in the pioneering days.

Due to its long half-life (~1.4 Ma), however, 10Be does not record short episodes of intermittent surface cover, e.g.

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Because of the specificity of its uptake by the human body, radioactive isotopes of iodine can also be used to treat thyroid cancer.Lal’s scaling factors are elegant and easy to use, but overestimate the importance of muons and are only valid for standard atmosphere.Later authors introduced several improvements, incorporating atmospheric effects and improved muon production systematics.The scaling factors of Stone (2000), Dunai (2000), and Desilets et al.(2003, 2006) more accurately represent the scaling of cosmogenic nuclide production rates with latitude and elevation, but the increased sophistication of these methods is an obstacle to their widespread use.

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