Note changes in Version 2.3:
Version 2.3 has updated muon interaction cross-sections and default Be-10 and Al-26 production rates. The latter are
derived from the 'primary' calibration data set of Borchers and others (2016).
Is your browser timing out before receiving the results?
It takes a few seconds to
calculate each exposure age. If the timeout setting on your browser is too short, it will stop
waiting for the page before the calculations are done. You can set the wait time to a longer
value on some browsers. If that's not true of yours (Safari, for example), you
will have to submit fewer samples at once.
Formatting instructions:
This form is designed to have text pasted into it from a text
editor or an Excel spreadsheet. The formatting requirements are unforgiving, but easy to follow once you have a spreadsheet set up appropriately.
An example spreadsheet is here.
The rules are as follows:
- Enter plain ASCII text only.
- Each sample should occupy its own line.
- Each line should
have fifteen elements, as described below.
- Elements
should be separated from each other by white space (spaces or
tabs).
- Something other than white space must be entered for each
element. For example, if you have no Al measurements for a sample, you
must enter "0" in the Al concentration and Al uncertainty positions.
In most cases, pasting directly from an Excel spreadsheet
should satisfy the rules. An example of an acceptable input text block
appears below.
The fifteen elements are as follows:
- Sample name. Any text string not exceeding 24 characters.
Sample names may not contain white space or any characters that
could be interpreted as delimiters or escape characters, e.g.,
slashes of both directions, commas, quotes, colons, etc. Stick to letters, numbers, and dashes.
- Latitude. Decimal degrees. North latitudes are positive. South latitudes are negative.
- Longitude. Decimal degrees. East longitudes are positive. West longitudes are negative.
- Elevation/pressure. Meters or hPa, respectively, depending
on selection below.
- Elevation/pressure flag. Specifies how to treat the
elevation/pressure value. This is a three-letter text string. If you have
supplied elevations in meters and the
standard atmosphere is applicable at your site (locations
outside Antarctica), enter "std" here. If you have supplied elevations in
meters and your site is in Antarctica, enter "ant" here. If you have entered
pressure in hPa, enter "pre" here. Any text other than these three options
will be rejected.
- Sample thickness. Centimeters.
- Sample density. g cm-3.
- Shielding correction. Samples with no topographic shielding, enter 1.
For shielded sites, enter a number between 0 and 1.
- Erosion rate inferred from independent evidence. cm
yr-1.
- 10Be concentration. Atoms g-1. Standard or scientific
notation.
- Uncertainty in 10Be concentration. Atoms g-1. Standard or scientific
notation.
- Name of Be-10 standardization. Text. Acceptable values for this parameter are given on
this page.
- 26Al concentration. Atoms g-1. Standard or scientific
notation.
- Uncertainty in 26Al concentration. Atoms g-1. Standard or scientific
notation.
- Name of Al-26 standardization. Text. Acceptable values for this parameter are given on
this page.
Note: Nuclide concentrations should already take account of carrier and process blanks.
Here is an example of an acceptable input text block. You can paste this in above to try a sample
calculation.
PH-1 41.3567 -70.7348 91 std 4.5 2.7 1 8e-5 123500 3700 KNSTD 712400 31200 KNSTD
01-MBL-059-BBD -77.073 -145.686 712 ant 4.75 2.65 0.997 0 353000 8000 KNSTD 1940000 49000 KNSTD
NH-1 57.968 -6.812 790 std 3 2.65 1 0 943000 28000 KNSTD 0 0 KNSTD
Here is an Excel spreadsheet containing example data that you can paste
in above to try a sample calculation.
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