Fast-neutron radiography -with 252Cf spontaneous fission neutron sources has been investigated using X-ray-film direct-exposure methods with either scintillator or hydrogenous intensifier screens;autoradiographic transfer detectors, of which indium and sulfur appeared to present the best possibilities;and track-etch methods with several cellulose nitrate materials . The exposure characteristics of these detectors were determined, and many of the detectors were tested radiographically. For the radiographic tests, emphasis was on observations of rubber and plastic components mounted on a steel base. The best observations, made with plastic-screen-film direct-exposure methods, indicated that only ~3 .2 mm of plastic on 1.27 cm of steel could be detected. Somewhat better contrast is indicated on transfer detectors, but geometry and intensity problems imposed limits on the radiographic tests.
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