The D10 value of Salmonella typhimurium ranged between 0.10 and 0.15 kGy in shrimps homogenate irradiated at refrigeration temperature (Kamat & Thomas, 1998). Earlier, Licciardello, Nickerson, and Goldblith (1970) reported that the D10 value of Salmonella sp. ranged between 0.18 and 0.39 kGy in different meat products at 0 ?C. Abreu et al. (2009) observed that shrimp samples inoculated with 107 S. enteritidis required 6 kGy to eliminate the bacteria but the count is much less under natural conditions, so, doses 1e3 kGy have been found highly effective against the bacteria (Badr, 2004).