Nanoparticles of silver were treaeted as clinical trials in some broiler farms for its disinfecting characters in 4 broiler farms during growing period. The nanosilver were used orally and inhalatory in amount of 2 -4 ppm and 40 ppm respectively. Some samples of Breast muscle, Femora muscle, Heart, Gizzard, Liver, Skin, Spleen, Lung, Kidney and Cloacal feces were collected randomly in slaughterhouse. The silver nanoparticles residues accumulation in samples were examined by miniature neutron source reactor (MNSR) with a high specificity and sensitivity in ppb levels. Regarding to the results the silver residues were detectable in all the samples (>131ppb), The average of residues in ppb level in examined samples were as 131(a) for Spleens, 132(a) for Gizzards, 144(a) for Hearts, 147(a) for Kidneys, 160(a) for Lungs, 168(a) (a)for Breast muscles, 172(a) for Femora muscles, 185(a) for Livers, 194(a) for Skins and 557(b) for cloacal Feces. Comparison of averages among treatments by ANOVA (Duncan) (p<0.05), showed that cloacal feces (557 ppb) has significant different with other treatments (different subscripted letter-b). Regarding to the results, nanosilver usages were limited just for surfaces of the farms by Iranian Veterinary Organization for public health opinions.