10Be - 26Al exposure age calculator

For calculating an exposure age when erosion rate is known independently.

Multiple sample form -- Heyman (2014) calibration data set compilation. This input form reflects the site-weighted averaging scheme in the paper.

Uses version 2.2 code. October, 2013.

Written by Greg Balco, balcs@u.washington.edu

 Calculators home

Notes:

Be-10 calibration data from:

Heyman, J., 2014. Paleoglaciation of the Tibetan Plateau and surrounding mountains based on exposure ages and ELA depression estimates.

Reference production rates and fit values are taken from Table 1 of the Heyman paper. Note that this relies on the statement in the paper that the same forward age calculation code used in the online calculator was also used for the production rate estimates; these calculations were not replicated here.

Heyman did not compile Al-26 concentrations. Thus, reference production rates for Al-26 in the table below are calculated from those for Be-10 using (P26 / P10) = 6.75.
Scaling scheme Reference Be-10 Percentage Reduced Reference Al-26
for spallation production rate (atoms/g/yr) uncertainty chi-squared production rate (atoms/g/yr)
St3.99+/-0.221.63-26.93+/-1.49
De4.02+/-0.2911.26-27.14+/-1.96
Du4.03+/-0.289.92-27.20+/-1.89
Li4.32+/-0.288.73-29.16+/-1.89
Lm3.94+/-0.201.92-26.59+/-1.35

Sample data entry:

Enter data block here.

Note change in Version 2.2:

Production rates and decay constants have been updated in this version to reflect the Be-10 restandardization and half-life revision in Nishiizumi et al., 2007. Thus, you must now specify the standard to which your Be-10 and Al-26 measurements have been normalized. This means that two input fields, the Be-10 and Al-26 standard names, have been added. You'll need to add two columns to your spreadsheets before cutting and pasting data. Refer to the new example spreadsheet here. For a list of currently available standards, see this page.

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