An apparatus (100) capable of viral inactivation of high absorbance liquid media is disclosed. The apparatus includes at least one coaxial cylinder (110) constructed of an outer cylinder (120) and an inner cylinder (130), a liquid media inlet (140), at least one emitter of type C ultraviolet radiation (145), and a liquid media outlet (150). The inner cylinder has an outer diameter adapted to form a gap (160) of between 1 to 5mm. The media flows in a substantially cyclonic flow path along the gap to achieve a narrow dose distribution from the UV emitter placed inside the inner cylinder.
