The purpose of this work is to explore the possibility of using an isotopic neutron source I'll'rnneutron activation analysis (N AA) for the first time at Addis Ababa University. Anrnamericium- beryllium neutron source was used to develop a method for activation analysisrnof copper in brass. Element analysis was completed by identilYing copper and thenrndetermining the concentration of copper in brass by comparative method. Neutron activationrnanalysis of1. Ni and ~·In has been canied out, and the results are also discussed