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acceptance alloy aluminium applied artificial radioactive atomic atomic pile Blowhole Brakes Calcium tungstate capsule cassette circuit container curie dark darkroom defect density diameter DIRECT TYPE FILM electrode emission emitted exposure chart faster film FILAMENT film and screens finished radiograph fluorescent screens fluoroscopy gamma gamma-radiography gas cavities gas pores graph half-life hour per mc industrial radiography inspecting authority intensifying factor intensifying screens intensity interpretation Inverse Square Law iridium irradiate lack of fusion lead screens material metre the radiation millicuries National Physical Laboratory object obtained parent metal penetrameter plate Porosity possible produce quality welding radiation from unshielded radio radioactive isotopes radioactive sources radioisotopes radium radon rays reducing exposure sand inclusions scattered sensitivity short S.F.D. shown in Fig silver halide Slag Inclusion Solus-Schall specimen standard steel Storage Block TANTALUM thickness tion tube current tungsten type of film Undercut unshielded gamma-rays usually wavelength weld metal X-ray sets X-ray tube