| 摘要 |
An apparatus for producing a thermal neutron radiograph includes an inspection head (20, 20') with an accelarator neutron generator (100, 100') mounted with a generator target (110, 110') positioned within the inspection head (20, 20'). The inspection head (20, 20') is filled with a moderating fluid. A collimator (40, 40') is mounted with its inlet window (48, 48') positioned within the moderating fluid in the inspection head (20, 20'). The neutron generator (100, 100') includes an evacuated tube (106, 106') with the target (110, 110') mounted on a extension (111, 111'). The tube (106, 106') is supported substantially coaxially within an elongated housing (102, 102') to provide a space therebetween. A system (164, 164') is provided for circulating an hydrogenous, electrically insulative moderating liquid in the space provided between the evacuated tube and housing to reduce radiation leakage, enhance the number of available thermal neutrons for radiography and provide electrical insulation against the high potential across the tube. |
