Corrugated reactors are known for their use in applications requiring exposure of a reaction medium or catalyst to UV radiation. During manufacture, the idealized sharp corner of a V-shaped geometry is replaced with a fold having quantifiable curvature. The effects of this curvature on UV absorption patterns, spatial absorption/incidence patterns and the total absorption efficiency are explored for a broad range of fold curvatures and film angles using a conservative, finite-element based discrete-ordinate model. The presence of curvature was found to redistribute radiation from the deepest confines of the V-shaped geometry to surfaces closer to the light source. The simulations performed suggest that at small film angles, moderate curvature can be incorporated within the fold of the film without significantly affecting the overall absorption efficiency. Detailed absorption data is included for use as a boundary condition for computational fluid dynamics-based simulations linking UV-radiation, reaction kinetics, and mass transfer. (c) 2011 American Institute of Chemical Engineers AIChE J, 2012