This study deals with the elemental analysis of rock sample which are collected from NorthrnWollo (Woldia). Neutron Activation Analysis (NAA) is a sensitive analytical technique usefulrnfor performing both qualitative and quantitative multi-elemental analysis of major, minor andrntrace elements in samples from almost every conceivable field of scientific on technical interest.rnAm-Be Neutron source was used. The mass of sodium found in 2.103 gm. of irradiated sample isrn0.034861216 gm.; which means 1.65 % of the irradiated sample is sodium