Abstract: A radiographic image is formed of a workpiece irradiated by neutron or X-ray energy. A radiophosphorescent screen is positioned adjacent the workpiece to form a scintillation pattern. The radiation may consist of thermal neutrons radiation from which gamma radiation has been substantially removed. The image is stored upon the semi-conductor target of a television camera.

Abstract: A radiographic imaging system (10) includes first and second housing segments (10a, 10b) with the second housing segment (11b) having a low-light-sensitivity television camera (13) mounted therein. The first housing segment (11a) has a radioluminescent screen structure (20) fitted within an opening (16). A workpiece (24) is positioned adjacent the radioluminescent screen (20) and between the screen and a source of radiation (25a, 25b). The screen structure includes means for producing a scintillation shadowgraph pattern in response to impingement on the screen of radiation directed through the object. The camera (13) has its optical input section directed toward the radioluminescent screen for receiving the scintillation shadowgraph pattern and has a target means for forming charge patterns corresponding to the scintillation patterns produced on the radioluminescent screen and scanning means for scanning the target means to generate an optical signal corresponding to the charge pattern formed on the target.

Abstract: In a system for generating thermal (14 MeV) neutrons containing an ionic accelerator, a novel thermal neutron collimator for producing a beam of collimated thermal neutrons is disclosed. The apparatus includes a substantially hollow collimator tube (10) having a closed, neutron permaeable inlet portion (20) communicating with a source of thermal neutrons (12) and an open outlet portion (22) disposed downstream of the inlet portion at the opposite end of the tube. The collimator walls (14,16,18) diverge outwardly toward the outlet portion of the tube and are formed of three radial layers comprising an outer layer of thermal neutron absorbing material (26) for absorbing off-axis thermal neutrons, an intermediate layer of lead (24) for absorbing X-rays and gamma rays and an inside layer of aluminum (23) for structural support.