1. Medical Electrical Equipment, Part 2: Particular Requirements for the Safety of Gamma Beam Therapy Equipment;IEC Publication 601,1987
2. Neutron Contamination from Medical Electron Accelerators;NCRP Report No. 79,1984
3. Medical X-Ray, Electron Beam and Gamma-Ray Protection for Energies up to 50 MeV;NCRP Report No. 102,1989
4. Giant dipole resonance neutron yields produced by electrons as a function of target material and thickness;Mao;Health Phys.,1996