Abstract
A detection system for the determination of the level of different layers inside the oil gravity separators is presented. The system is based on prompt gamma neutron activation analysis using D-T neutron source. The performance of the system proved to be superior to current and potential nuclear counting techniques proposed in the literature for the same purpose including neutron backscattering, gamma backscattering, and gamma transmission. According to the concept design calculations using the Monte Carlo method, the proposed system detects the levels of different layers with high accuracy. This concept design is the first stage of the research project entitled "design of an instrument for measurement of oil, water, vapour and sand layers in oil separators using neutrons'' supported by King Abdulaziz University.