Paper describing the calculation methods: PDF

This paper was published in Quaternary Geochronology (v.3, p. 174, 2008) and is intended to be the referenceable documentation for exposure ages and erosion rates calculated here. For basic information about the inner workings, goals, assumptions, and limitations of the calculators, read this first.

Update to paper: The published paper accompanied version 2.1 of the online calculators. The upgrade to version 2.2 means that some information in the published paper is now obsolete. The following document details the changes between version 2.1 and 2.2 and revises the parts of the original paper that are no longer up-to-date. PDF

Supporting data and documentation:

MATLAB function reference (revised November 14, 2007): PDF HTML

Geological calibration data set: Excel spreadsheet

Plots comparing the various scaling schemes: HTML

Mailing list:

I maintain a mailing list intended to notify users of the cosmogenic-nuclide calculators about changes, updates, or newly discovered bugs. I don't anticipate that there'll be very much traffic on this list, but I strongly suggest that users subscribe to it so that they'll be quickly notified of any errors that we might discover. Subscribe to the list here: CRONUS-calculators mailing list

Blog

I maintain a blog about cosmogenic-nuclide geochemistry here. This contains a lot of information about the online calculators; when I respond to questions about the calculators I commonly post the answers as blog entries. It also contains a lot of opinion. This site is not supported or authorized by CRONUS-Earth.

Update and debugging history

Description of how to compute nuclide concentrations from isotope ratio measurements: PDF HTML

This document gives instructions on how to a) reduce the isotope ratios actually reported by an AMS lab to the nuclide concentrations in quartz that are required for the exposure age/erosion rate calculators, and b) account for carrier and process blank uncertainty.

Direct access to MATLAB code

Last resort: contact Greg Balco: balcs@u.washington.edu