TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: The method further involves conveying the second treated biomass material out of the second enclosure. The method further involves conveying the biomass into a third enclosure, conveying the biomass within the third enclosure and exposing the second treated biomass material to a third dose of ionizing radiation to produce a third treated biomass material. Conveying of biomass utilizes a pneumatic conveyor system and/or a screw conveyer system. Conveying into and/or out of enclosures occurs continuously. The biomass material and/or the first treated biomass material is/are conveyed by a vibratory conveyor within the enclosure(s). Conveying with the vibratory conveyor occurs continuously. Processing of the material occurs at an average rate of 5000-25000 (preferably 2000-6000, especially 2000-5000) lb per hour i.e. the material is conveyed through the enclosures at a rate of 5000-25000 (preferably 2000-6000, especially 2000-5000) lb per hour. The first and second dose of ionizing radiation are applied using accelerated electrons produced by an accelerator, each accelerator operating at a power of 100-400 (preferably 100-300, especially 100-200) kW. Preferred Device: The first enclosure shares at least one common wall (310) with the second enclosure. The first and second dose of ionizing radiation is applied using accelerated electrons from at least electron accelerators. The electrons are accelerated to an energy of 0.3-5(preferably 0.5-3.5, especially 0.8-2) MeV. The first dose is 0.5-20 (preferably 1-15, especially 5-15) Mrad. The sum of the first and second dose of ionizing radiation is 10-40 (preferably 20-40, especially 15-35, particularly 15-30) Mrad. The walls of both the first and second enclosures are fabricated from discrete interconnecting blocks to provide photon-tight structures. The method further involves conveying the biomass material into the first enclosure and then conveying the first treated biomass out of the first enclosure and into the second enclosure. The walls of both the first and second enclosures are fabricated from discrete interconnecting blocks configured to provide a photo-tight structure. EXAMPLE - No suitable example given.