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100 milligrams absorption amount of radium blackening casting control line convenient correct exposure cracks curve darkroom definition density depend desired determined distance between source distance from radium distance of 18 dosage received duplicate films emulsion exposure holder factors film holder film-to-source distance fixing solution gamma radiation gamma radiography gamma rays graph graphic illumination inches indicate inspec INSTRUCTIONS FOR GAMMA-RADIOGRAPHY intensifying foil lead intensifying screens linear weld Naval Research Laboratory Navy Department necessary normal exposure personal exposure placed portions possible potassium potassium iodide radio radiographic exposure radiographic film radiographic inspection radium capsule radium cartridge radium source radium-to-film distance radon reduces the intensity removed required exposure Screen film shown in figure single viewing source intensities source of radiation specified steel cartridges stolen radium suitable surface markings tank technique temperature test object thickness of metal thickness of steel tion types of film Ultra-Speed various thicknesses varying X-ray radiography