9National Council on Radiation Protection and Measurements (U.S.). NCRP Report No.51. Radiation protection design guidelines for 0.1-100 MeV particle accelerator facilities: recommendations of the National Council on Radiation Protection and Measurements JR]. Washington D.C.: The Council, 1977.
10American National Standards Institute. IEC 60601-2-1:1998 Medical electrical equipment. Particular requirements for the safety of electron accelerators in the range 1 MeV to 50 MeV [S]. Washington D.C.: American National Standards Institute, 2007.