Acoustic radiation from a spherical source undergoing angularly periodic axisymmetric harmonic surface vibrations while eccentrically suspended within a thermviscous fluid sphere, which is immersed in a viscous thermally conducting unbounded fluid medium, is analyzed in an exact fashion. The formulation uses the appropriate waveharmonic field expansions along with the translational addition theorem for spherical wave functions and the relevant boundary conditions to develop a closed-form

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... n in form of infinite series. The analytical results are illustrated with a numerical example in which the vibrating source is eccentrically positioned within a chemical fluid sphere submerged in water. The modal acoustic radiation impedance load on the source and the radiated far-field pressure are evaluated and discussed for representative MIues of the parameters characterizing the system. The prcposed model can lead to a better understanding of dynamic response of an underwater acoustic lens. It is equally a p plicahle in miniature transducer analysis and design with applications in medical ultrasonics.