The adoption of low-cost, extensive cellulose as a source of raw materials to produce fuel ethanol is an important direction for the development of biomass energy in future. It is hard to hydrolyze because of the complex structure and low reactivity of natural cellulose. Therefore, a proper pretreatment to cellulose materials to change the structure and to improve the reactivity becomes a necessity. Compared with traditional pretreatment, there are many advantages while using irradiation to treat natural ce...