Be-10 calibration data from:

Young N.E., Schaefer J.M., Briner J.P., Goehring B.M., 2013. A Be-10 production rate calibration for the Arctic. Journal of Quaternary Science, v. 28, pp. 515-526.

Calibration data: Excel spreadsheet

As discussed in the source paper, the reference production rates are inferred from calibration data from several sites around Baffin Bay, and production rate uncertainties include scaling uncertainty derived from other production rate calibration sites at high latitude in the Northern Hemisphere. Here these uncertainties are used. Thus, this reflects the "Arctic" reference production rates in Table 3b. The authors propose that these production rate estimates are applicable at the stated uncertainties for Holocene and late-glacial sites throughout the Arctic.

As discussed in the source paper, these production rates were estimated using a fitting algorithm that incorporates one-sided (i.e., minimum or maximum) radiocarbon age constraints. Thus, chi-squared fit values are not meaningful and not reported below. MATLAB code to do this calculation is available at the higher level page.

Small differences (< 1%) between the reference Be-10 production rates inferred from the calibration data in the table below and those reported in Table 3b in the source paper are due to differences in the code used to do the calculation and, to a lesser extent, rounding errors. To ensure consistency between production rate calibration and exposure-age calculations, the values in the table below are calculated using the same code that is used to compute the exposure ages in the online calculator.

Young et al. did not measure 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.