Light Scattering Behaviour of Thorium Phosphate Gel-forming System

The changes in depolarisation values and in intensity of transversely scattered light of thorium phosphate gels, prepared by diluting acid solutions of thorium phosphate, have been investigated. The results show that the particles grow in size owing to agglomeration. This study also reveals that the particles in the set gels are very nearly spherical in shape. The intensity values show a gradual change initiall_y ; thereafter it attains a steady value. The dissymmetry : ratio I₄₅°/ I₁₃₅° fails to provide true indication of probable shape of the particles in this system.