No abstract

Irradiation of ground beef and beef liver inoculated with Campylobacter jejuni was performed with gamma rays from a cobalt 60 source. Samples were packaged in gas barrier bags, sealed in air or under vacuum, and irradiated under refrigerated or frozen conditions. D 10 values (dose required to inactivate 90 % of a microbial population) ranged from 0.21 to 0.46 kGy in ground beef and from 0.26 to 0.69 kGy in beef liver. The D 10 value for beef liver was higher than for ground beef under each irradiation condition, with the highest values being obtained under vacuum and frozen conditions.