Power measurement in Tehran research reactor (TRR) using 16N gamma ray activity

Interaction of fast neutrons with oxygen atoms of cooling water in reactor core leads to the production of 16N isotope which emits 6.13 MeV gamma ray. A system is developed to measure the 16N gamma ray activity using a5.08cm ×5.08cm NaI(Tl) detector. A suitable electronic system is used to count 16N gamma rays in different reactor powers in order to calibrate the 16N system in terms of reactor power. Some non-linearity in the system behavior have been observed and discussions have been presented for this effect.