Radionuclide dating

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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.Production rates are the “achilles heel” of the TCN method.There exist only a few calibration sites where TCN production rates are accurately known thanks to the availability of independent age constraints (e.g., Nishiizumi et al., 1989; Niedermann et al., 1994; Kubik et al., 1998).

At the same time, all the default parameters can be changed so that Cosmo Calc is highly customizable and also experienced users should find it useful.The oldest and still most widely used scaling model is that of Lal (1991).This model is a simple set of polynomial equations giving the (spallogenic muogenic) production rate relative to SLHL as a function of geographic latitude and elevation.After installing the Cosmo Calc add-in, a toolbar menu appears (Figure 1) that guides the user through the data reduction and closely follows the outline of this paper: The following sections will provide more details about these calculations.Thus, the present paper serves as an abridged review of TCN calculations, with an emphasis on the numerical methods that are needed to solve the equations.

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