RADIOGRAPHER: Any individual who performs or who, in attendance at the site where the sealed source or sources
are being used, personally supervises radiographic operations and who is responsible to the licensee for assuring
compliance with the requirements of these regulations and the conditions of the licenses.
RADIOGRAPHERS ASSISTANT: Any individual who under the personal supervision of a radiographer, uses
radiographer exposure devices, sealed sources or related handling tools, or survey instruments in radiography.
RADIOGRAPHERS EXPOSURE DEVICE: Any instrument containing a sealed source fastened or contained therein,
in which the sealed source or shielding thereof may be moved, or otherwise changed, from a shielded to unshielded
position for purposes of making a radiographic exposure.
RADIOGRAPHIC CODE: A code for specifying minimum standards related to radiographic practices.
RADIOGRAPHIC EXPOSURE DEVICE (RT): See EXPOSURE DEVICE.
RADIOGRAPHIC FILM (RT): See FILM, RADIOGRAPHIC.
RADIOGRAPHIC PAPER (RT): White paper coated on one side with emulsion, suitable for some purposes as an
alternative to X-ray film.
RADIOGRAPHIC PROJECTION METHOD (RT): A method whereby image magnification is achieved by projection.
RADIOGRAPHIC QUALIFICATION TEST: A procedure for determining the optimum value of the d/t ratio, or the
proper working distance of an X-ray tube or a radioactive source.
RADIOGRAPHIC QUALITY LEVEL (RT): An expression of the quality (sensitivity) of a radiograph in terms of an
image quality indicator (penetrameter). When a standard hole-type penetrameter is used, quality level is stated as a-bT,
where a is the penetrameter thickness, expressed as a percentage of the maximum thickness of the specimen, and b is
the diameter of the smallest discernible hole, expressed as a multiple of penetrameter thickness, T. For example, the 3-
2T quality level means that the penetrameter thickness equals 3 percent of maximum specimen thickness, and the
smallest discernible penetrameter hole has a diameter equal to twice the penetrameter thickness.
RADIOGRAPHIC RANGE (RT): See EXPOSURE LATITUDE.
RADIOGRAPHIC SCREEN (RT): See INTENSIFYING SCREEN.
RADIOGRAPHIC SCREENS: Metallic or fluorescent sheets used to intensify the radiation effect on films.
RADIOGRAPHIC SENSITIVITY (RT): See SENSITIVITY, RADIOGRAPHIC.
RADIOGRAPHICALLY SIMILAR MATERIAL (RT): A material or alloy that has approximately the same radiation
absorption as the material being radiographed.
RADIOGRAPHIC CONTRAST (RT): See CONTRAST, RADIOGRAPHIC. RADIOGRAPHIC DEFINITION (RT):
See DEFINITION, RADIOGRAPHIC. RADIOGRAPHIC ENERGY (RT): See ENERGY, RADIOGRAPHIC.
RADIOGRAPHIC EQUIVALENCE FACTOR (RT): The factor by which the thickness of a material must be
multiplied in order to determine what thickness of a standard material (often steel) will have the same absorption.
RADIOGRAPHIC INSPECTION (RT): The use of X-rays or nuclear radiation or both to detect discontinuities in
material, and to present their images on a recording medium.