Hello All, I'm trying to find the total dossage required to sterilize a sample of gold tailings using a cobalt-60 source. As long as the thiobacillus ferro-oxidans is irradiated, that should be sufficient. A short literature review mentionned both 2 Mrad (1969) and 5 Mrads (1994??). I'm hoping someone out there has more recent data. Thanks, Rod