Icone15-10426 Innovative Alpha Radioactivity Monitor for Clearance Level Inspection Based on Ionized Air Transport Technology (Ii) : CFD-Simulated and Experimental Ion Transport Efficiencies for Uranium-Attached Pipes

Abstract

An innovative alpha radioactivity monitor for clearance level inspection has been developed. This apparatus measures an ion current resulting from air ionization by alpha particles. Ions generated in the measurement chamber of about 1 m 3 in volume are transported by airflow to a sensor and measured. This paper presents computational estimation of ion transport efficiencies for two pipes with different lengths, the inner surfaces of which were covered with a thin layer of uranium. These ion transport efficiencies were compared with those experimentally obtained for the purpose of our model validation. Good agreement was observed between transport efficiencies from simulations and those