RESEARCH ON RADIOGRAPHIC TECHNIQUES OF GRAPHITE EVALUATION.
Summary technical rept. for 1 Jun 63-31 May 64,
OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS
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Technique charts are presented for the radiography of graphite in the medium thickness range 2 to 14 inches using typical industrial X-ray equipments. Results of experimental data presented in this report demonstrating the problems in the radiography of graphite are due to scatter radiations and economics of inspection. The thicknesses of graphite billets now ranging up to 103 inches present geometrical unsharpness problems as related to economy of inspection. When the X-ray source is removed from the film sufficient distances to obtain a reasonable DT ratio, exposure times become uneconomical. Techniques reported also demonstrate that better than 1 per cent radiography can readily be obtained using typical industrial techniques and lead filtering, for the ranges of thicknesses from 12 to 40 inches. Author