Jerry wrote: > Help! CRE age??
CRE age = cosmic radiation exposure age. As soon as a chunk of matter has been released into space from its parent body it gets exposed to the solar wind and cosmic radiation, and as soon as it lands on our planet the period of exposure ends. The particles/isotopes implanted by the solar wind and by cosmic radiation can be measured, and the CRE age can be determined, meaning the transition time from the meteorite's parent body to Earth, i.e., the time that it has been actually floating in open space as a meteoroide. Not to be confused with crystallisation age or terrestrial age... Hope this helps, Norbert ______________________________________________ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
