Production and shielding of 15 MeV neutrons

摘要: Abstract The characteristics of various types D-T neutron generators are described and the current status development fast therapy machines is reviewed. For clinical applications a minimum average yield 4 × 10 12 neutrons/sec required. However, it concluded that at present no 15 MeV radiotherapy system can produce this output for reasonable period time, e.g. 50 hr. Further developments all systems urgently properties tritium targets discussed with respect to target life time radiation hazards. Experimental data presented on as function energy bombarding deuterons age. contents oil accelerator vacuum pumps gas released exhaust opening rotary pump have been measured. It only small fraction total amount originally in expelled through forepump exhaust. With regard shielding neutrons, summary has given experimental attenuation materials.