T9074-AS-GIB-010/271 Rev 1
3.4.7 Radiographic Location Markers. The images of the location markers for the coordination of the part with the film shall appear on the film without interfering with the interpretation and with such an arrangement that it is evident that complete coverage was obtained. These marker positions shall be marked on the part and the position of the markers shall be maintained on the part during radiography. When using a technique in which radiation passes through two walls and the welds in both walls are viewed for acceptance and the entire image of the object being radiographed is shown on the radiograph, only one location marker is required on the base metal at the center of the area being examined. Markings shall be in accordance with MIL-STD-792. 3.4.8 Film Identification. A system of positive identification of the film shall be used and each film shall have a unique identification relating it to the item being inspected. As a minimum, the following additional information shall appear on each radiograph or in the records accompanying each radiograph: a. Identification of the organization making the radiograph. b. Date of exposure. c. Identification of the part, component, or system and, where applicable, the weld joint in the part, component, or system. d. Whether the radiograph is of the original area or a repair area.
3.4.9 Maintenance of Radiographic Records. Radiographic records shall be maintained as specified in 1.8.4.
3.4.10 Darkroom Facilities. Darkroom facilities, including equipment and materials, shall be capable of producing uniform, blemish-free radiographs. 3.4.11 Film Viewing Facilities. A subdued level of background lighting shall be maintained in film viewing facilities to prevent reflection on the radiographic film that interferes with interpretation. 3.4.11.1 Film Viewing Equipment. Equipment used for radiographic interpretation shall provide the following minimum features: a. A light source of sufficient intensity controlled to allow the selection of optimum intensities for viewing film densities specified in 3.4.3.2. The required intensity range may be provided by the use of a separate high intensity viewing port. The light enclosure shall be so designed to provide a uniform level of illumination over the entire viewing surface. b. A suitable fan, blower, or other cooling device to provide stable temperature at the viewing port such that film emulsions shall not be damaged during l minute of continuous contact with the viewing surface. c. An opal glass front in each viewing port, except for high intensity viewers used for high density film. d. A set of opaque masks to suit the sizes of radiographs to be viewed, or equivalent. e. A densitometer meeting the requirements of ASTM E1079 shall be provided for assuring conformance with film density requirements. The densitometer aperture size shall not be greater than 2 millimeters in diameter. 3.4.12 Surface Preparation of Components and Welds Prior to Radiography. Metal components shall be free of scale, surface slag, adhering or imbedded sand, or other surface conditions that may interfere with proper interpretation of radiographs. With the exception of undercuts at the toe of the weld that are within specification allowances, the contour of welds shall blend smoothly and gradually into the base metal. Excessive weld ripples or weld surface irregularities shall be removed by any suitable mechanical process to such a degree that the resulting radiographic contrast due to any irregularity cannot mask or be confused with the image of a defect. 3.4.13 Safety. Radiographic tests shall be performed under protected conditions such that personnel shall not receive a whole-body radiation dosage exceeding the maximum permitted by city, state, or national codes.
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