This is a set of Matlab .fig and Origin .opju files corresponding to the figures in the paper 'Particle dynamics in horizontal stirred bed reactors characterized by single-photon emission radioactive particle tracking' published in Chemical Engineering Journal. In this study, a single-photon emission radioactive particle tracking technique is employed to obtain insight into the particle dynamics in a horizontal stirred bed reactor. The data was obtained using the single-photon emission radioactive particle tracking technique.