10Be - 26Al exposure age calculator

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

Multiple sample form -- User-supplied calibration data
Version 2.3. June, 2016. Written by Greg Balco, balcs@u.washington.edu

 Calculators home
$calib_results_vars$

Production rate calibration summary:

Calibration data set name: $calib_name$
Computation time: $calib_calc_time$ sec
Calibration wrapper version: $calib_ver$
Objective function version: $P10fit_ver$
Age calculation version: $get_age_ver$
Muon calculation version: $muon_ver$
Constants version: $consts_ver$
$calib_results_text$
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)

Note that the reference Al-26 production rates are not independently calibrated here. They are derived by multiplying the calibrated reference Be-10 production rate by the production ratio.

Scaling scheme fits to calibration data: This plot shows the fit between each scaling scheme and the calibration data. The filled circles are calculated reduced chi-squared values for evenly spaced trial values of the reference Be-10 production rate. The corresponding lines are the polynomial interpolations used to determine the value that minimizes the fit parameter. Colors: black, St; red, De; green, Du; blue, Li; cyan, Lm. If the lines don't go through the corresponding colored data points, or if they don't look more or less parabolic, there is likely a problem with the fit algorithm.

$calib_fit_plot_text$

Same thing, different presentation:This plot shows ratios of exposure ages for the calibration calculated using the best-fitting reference production rate (t) to the actual independently determined ages of the sites (truet). Color coding for scaling schemes as above. The gray band represents the 1-std-err uncertainty in the best-fitting reference production rate. There is no particular significance to elevation as the independent variable other than that it usually spreads out the data nicely.

$calib_elevation_plot_text$

Sample data entry:

Enter data block here.

Note changes in Version 2.3:

Version 2.3 has updated muon interaction cross-sections and default Be-10 and Al-26 production rates. However, if you are on this page you are not using the default production rates.