Eighty random samples of broiler chicken carcasses were collected from an automatic poultry slaughtering plant in Dakahlia Governorate just after washing in the chiller and divided into four groups each group consists of 20 chicken carcasses which subdivided into two subgroups (ten carcasses for each subgroup). The 1^st group left as a control. The 2^nd group decontaminated with 25ppm chlorine (first subgroup), the other subgroup decontaminated with 50ppm chlorine for three minutes. The results were reduced significantly when compared with corresponding control statistically for both concentrations. The 3^rd group were decontaminated with 1% hydrogen peroxide (first subgroup) and the other subgroup decontaminated with 2% hydrogen peroxide for two minutes Where the Aerobic Plate Counts (APCs), Most Probable Number (MPN) count and the counts of Staph.aureus were reduced significantly when compared with corresponding controls (P<0.05). The 4^th group decontaminated with gamma rays first subgroup irradiated with 2Kilo Gray(KGy) and the other subgroup irradiated with 3KGy. The irradiation results of APCs were reduced significantly (P<0.05) after irradiation with 2KGy and 3KGy, MPN count were reduced significantly (P<0.05) after irradiation by 2KGy and no growth after irradiation with 3KGy and the counts of Staph.aureus were reduced significantly (P<0.05) after irradiation with 2KGy and no growth after irradiation by 3KGy.