Cosmic rays, and their secondaries don't just leave ionization trails in the atmosphere...they leave them in you, me, and everything near the surface of the Earth. Ancient ceramics store the energy as lattice defects, and then relax and release it when heated...thermoluminescence. see:
http://www.scienzaonline.com/archeol...cence.htmlYour body repairs most of the cellular damage, but nothing lasts forever. Some of the secondaries release neutrinos which can penetrate and cause some trivial/nontrivial effects throughout the interior of the Earth.
