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Radiohalos are tiny discolorations produced by radioactive decay. They provide some amazing evidence for a young earth. Richard Fangrad and Calvin Smith discuss this fascinating article from Creation magazine.
From Creation magazine 28(2) Radiohalos—Startling evidence of catastrophic geologic processes on a young earth http://creation.com/radiohalos-startling-evidence-of-catastrophic-geologic-processes-on-a-young-earth" style="color:lightblue" target="_blank">http://creation.com/radiohalos-startling-evidence-of-catastrophic-geologic-processes-on-a-young-earth