These cosmic rays originate from high-energy supernova explosions in space.
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These cosmic rays do not penetrate deep into the earth’s surface.
This is important for glacial geologists, as it means that surfaces that have had repeated glaciations with repeated periods of exposure to cosmic rays can still be dated, as long as they have had sufficient glacial erosion to remove any inherited signal.
Beryllium-10 (Be) does not occur naturally in quartz, and once it forms following spallation it becomes trapped by quartz’s regular crystal lattice.
For a rock to be suitable for cosmogenic nuclide dating, quartz must occur in the rock in sufficient quantities and in the sufficient size fraction.
Rock samples may be collected with a hammer and chisel or with a rock saw. One of the largest errors in cosmogenic nuclide dating comes from a poor sampling strategy.