The suspending liquid consists of various concentrations of particles which are either0.22μm or0.494μm in diameter and were mixed into filtered,distilled water,and serve as the scattering medium forstudying the polarization property of radiation side-scattered by the particles.The experiment results showthat the de-polarization of radiation side-scattered by the particles is very sensitive to the variation of theparticles’diameters: the horizontal polarization degree of the side-scattered radiation of the particles withsmaller diameters is much higher than that with larger diameters,but the vertical polarization degree of theside-scattered radiation of smaller particles is much lower than that of larger particles.