The basic concept here is that if your sample stays at the surface and experiences steady exposure with or without erosion, nuclide concentrations are confined to the “simple exposure region” highlighted with dark lines in the above figure.
In certain manifestations of this diagram (primarily when plotted with a log x-axis and a linear y-axis), the simple exposure region vaguely resembles a banana, for example: This resemblance, perhaps unfortunately, has resulted in the common use of the term “banana diagram.” Then the important aspect of this diagram is that if the sample gets buried after a period of surface exposure, both Al-26 and Be-10 concentrations decrease due to radioactive decay, and Al-26 decreases faster than Be-10.
This is represented by a trajectory that goes down and to the left, as shown above in the Granger example.
So samples that are “below the banana” have experienced both a period of exposure and a period of burial.
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Basically, the diagram shows Be-10 concentration on the x-axis and the Al-26/Be-10 ratio on the y-axis, although commonly both quantities are shown in normalized units computed by dividing observed concentrations by the respective production rates at the sample site – this normalization allows plotting data from different sites, with different production rates, on the same axis.
He is serving as a member of the editorial review boards of Project Management Journal since 2002. Anbari earned his Ph D in Project Management and Quality Enhancement, MBA, and MS in Engineering from Drexel University.
Dr Kwak's main research interests include project management and control, risk management, and technology management. He gained extensive industrial experience serving in leadership positions at Amtrak, Day and Zimmermann, and American Water Works Service Company.
Here is an example of a Be-10/Ne-21 two-nuclide diagram from one of my papers: Here I have put Ne-21 (the longer-lived nuclide) on the x-axis and the Be-10/Ne-21 ratio on the y-axis. I think no matter what the nuclides involved, you should always do it the same way as is commonly done for Al-26/Be-10 diagrams, so that burial goes down.
So, again, exposure goes to the right and burial goes down. Although I have not made a systematic historiographic study of this phenomenon, I believe that the European style is largely just due to the fact that the “Cosmo Calc” software put together by Pieter Vermeesch does it this way. Nearly all the two-nuclide diagrams in the existing literature involve the normal implementation of the Al-26/Be-10 diagram, so anyone familiar with this literature expects exposure to go to the right on a tw0-nuclide diagram, and burial to go down.