Cosmogenic exposure age dating

This secondary cosmic ray shower is rapidly attenuated as it travels down into the atmosphere.

Only a very small fraction of the secondary cosmic rays, which mostly consist of neutrons, reach the surface of the Earth.

As the particle approaches the surface, it sees an exponentially increasing cosmic ray intensity and cosmogenic nuclide production rate.So with time, the sample will move down a line on the banana plot.The burial age can be calculated from the distance of the sample below the steady state erosion island.The most common examples of such paired measurements are = 0.The most important example of studies which require samples that plot on the zero erosion line are exposure dating studies of glacial retreat.

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These neutrons then collide with the elements that are found in rocks and soils, such as silicon, oxygen, calcium etc.

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