Hailu, Tamene2018-07-042023-11-092018-07-042023-11-092009-06http://10.90.10.223:4000/handle/123456789/6241The build-up and decay of radioactivity in arsenic caused by reaction with slow neutrons will be studied. In particular, we will be able to measure the radioisotope capture cross section of the sample, using a GM-counter on the decay of radioactivity data taken. We will also a measurement of the half life of the sample and we will show that the activity level reaches an asymptotic value using slow neutron activation analysis techniqueenReaction in AS-75Thesis