Patent ID: 8287524

Claim:
An apparatus for performing radiation energy treatments at a treatment site on a surface of a biomass, said apparatus comprising: at least one radiation energy source for supplying a treatment radiation; and an adjustable irradiation head assembly; wherein the adjustable irradiation head assembly is configured to receive the treatment radiation from the at least one radiation source and includes: at least one adjustable collimator assembly for directing radiation from the at least one radiation energy source light emitted to the treatment site; and a collector for collecting radiation not absorbed at the treatment site and reflecting the radiation back to the treatment site, the collector having a contact surface that can be engaged with the surface of the biomass; wherein the collector is adjustable to maintain a set distance between the adjustable collimator assembly and the contact surface; and wherein the collector includes a focal length setting mechanism having a lens, and wherein the lens is movable relative to an outlet aperture of the adjustable collimator assembly when the collector is adjusted to thereby produce a given spot size, shape or energy density of the treatment radiation emitted from the adjustable head assembly.