Nondestructive and quantitative method for measuring radioactivity from crud, liquids and gases in a contaminated pipe

Abstract

A nondestructive measuring method was developed to quantify separately radioisotope concentrations of crud, liquids and gases in a contaminated pipe. Based on this method, a state-separation analysis code was also developed. An experimental system was constructed and a performance test was conducted using a mock-up contaminated pipe. The measurement accuracy of this method is 10 to approximately 14%, which was determined by comparison with solid and liquid radioisotope concentrations in a mock-up contaminated pipe that had been previously quantified in advance. Furthermore, by evaluating the measurement error and the state-separation performance, it is concluded that this measuring method is applied to measure separately the crud, liquid and gaseous radioactivity in various pipes in a nuclear power plant.