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Research and Development on Advanced Graphite Materials. Volume XVII - Radiography of Carbon and Graphite

Report Number: WADD TR 61-72 Volume 17
Author(s): T. C. Furnas; M. R. Rosumny
Corporate Author: Picker X-Ray Corp
Laboratory: Air Force Materials Laboratory
Date of Publication: 1964-04
Pages: 32
Contract: AF 33(616)-6915
Project: 7350
Task: 735002
AD Number: AD0600339

Abstract:
A study was made to establish optimum exposure conditions for the radiographic detection of minimum size defects in thicknesses of graphite varying from four to sixteen inches. Through the use of grids and associated techniques, 0.5 per cent sensitivity or better was attained on high density graphite as follows:

4 in. Graphite -- 0.5 per cent sensitivity on M, single emulsion on M and HD films at 110 KV.

8 in. Graphite -- 0.4 per cent sensitivity on AA film at 150 KV.

12 in. Graphite -- 0.35 per cent sensitivity on HF film with Cobalt-60.

16 in. Graphite -- 0.3 per cent sensitivity on HD film with Cobalt-60.

Other parameters and techniques were investigated, such as direct X-ray magnification, screens, films, developers, and position of defect. The use of the grid made the greatest contribution towards an increase in sensitivity.

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