title: An iterative position reconstruction algorithm for radioactive particle techniques.
abstract: The Computer Automated Radioactive Particle Tracking (CARPT) technique is widely used to monitor the motion of the flow inside a reactor. Usually a single radioactive particle that is neutrally buoyant with respect to the phase is used as a tracker. The particle moves inside the volume of interest and its positions are determined by an array of scintillation detectors counting incoming photons. Well-known reconstruction algorithms have been traditionally used to map measured counts into the particle position coordinates by solving a minimisation problem between measured events and calibration data. However, these algorithms have serious drawbacks. Their accuracy is determined by resolution of a calibration grid, which results in low accuracy measurements in cases where the measurement interval is short. The article presents an original algorithm for reconstruction of the trace position. The reconstruction procedure calculates iteratively the trace position of the specified calibration data. The results of the simulations based on the MCNP5 package showed that compared with results obtained using the classical approach, the accuracy of the reconstruction position is increased by 46% for low noise counts and 38% for high noise counts. The technique can successfully be applied to monitor the motion of a radioactive tracer in a reactor.
authors.affiliation: Institute of Applied Computer Science, Lodz University of Technology, Poland. volodymyr.mosorov@p.lodz.pl
authors.forename: Volodymyr
authors.initials: V
authors.lastname: Mosorov
keywords: Iteration procedure; Non-invasive technique; Radioactive isotope; Reconstruction algorithm