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X-RAY IMAGE SYSTEM FOR NONDESTRUCTIVE TESTING OF SOLID PROPELLANT MISSILE CASE WALLS AND WELDMENTS
OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS
A television X-ray image enlargement system was developed for in-motion examination of missile case materials and weldments. This system is based upon the use of small-diameter photoconductive television camera tubes as direct sensing media for penetrating radiations such as X-rays. Ten experiment X-ray-sensitive, 1-in.-diam television camera tubes were evaluated. Five tubes were built to identical specifications to test reproducibility of the tube design. These tubes had similar response characteristics. After the initial tests, 4 of the 5 tubes failed due to target deterioration. The remaining 5 tubes have gol layers of varying thicknesses. The tubes with gold layer thicknesses of 40 to 100 microns have signal current responses inversely proportional to the X-ray source radiation wavelengths up to 200 kv. Tests of a 1-in.-diam light-sensitive camera tube indicate that it has a signal output sensitivity about equivalent to X-ray-sensing tubes with thin Se 8 microns targets. One of the TK-21C television camera chains was set up to conduct tests of an intermittent scan technique. Results of this test indicate that X-ray-television images can be displayed at low radiation levels down to 0.0003 rmin by exposing the camera tube over a long time interval up to 13 min. Author