MCNP5 code in radioactive particle tracking.

Radioactive particle tracking techniques have been widely applied in the field of chemical engineering, especially in hydrodynamics in multiphase reactors. In classical approach, the phenomenological model is used to simulate the number of counts measured by the detector and then the tracer position is reconstructed by solving a minimisation problem between the measured events and the mentioned model. The paper presents an original algorithm for reconstruction of the tracer position during the radioactive particle tracking based on the Monte Carlo N-Particle code version 5. The validation of the proposed algorithm is evaluated for two cases: 'ideal' and physically realistic. The advantages of the new algorithm are demonstrated.