A-A-53327A
General test. Test radiographs shall be made at a focal spot to film distance of 40 plus or minus 1 inch, at 80 Kvp, with screen-type, medium speed x-ray film. The x-ray tube shall be perpendicular to the center of the cassette. The nominal focal spot size of the x-ray tube shall not be than 1.0 mm. A minimum of 2.3 mm of aluminum filtration shall be in the useful beam. The exposed x-ray film shall be developed in accordance with the manufacturer’s instructions. The developed x-ray film shall be viewed with an unaided eye using a fluorescent type x-ray film illuminator.
Drop test. The selected sample shall be dropped on each corner from a height of 30 inches onto a concrete floor. The cassette shall be dropped so that the plane of the cassette is perpendicular to the floor and the center of gravity of the cassette is directly over the corner which strikes the floor. Except for deformation at the impacted corner area, the cassette shall show no other sign of damage. Any other kind of damage shall constitute a defect. After the drop test, the sample cassette shall be subjected to and pass the flatness test, lightproof test, and film contact test. For the type II cassette, the grid shall be removed from the cassette prior to the drop test.
Flatness test. The test for flatness shall be conducted on the open and closed cassette. The cassette frame shall rest on a flat test surface and any height variation shall be measured by passing feller gages between the flat surface and the frame. The deviation from flatness of the front panel shall be determined by straight edge placed at various angles on the front panel. The damage corners resulting from the drop test shall not be place on the flat test surface, and shall not be measured. Both frame and front panel shall be flat within 1/32 inch. any deviation shall constitute a defect.
X-Ray opacity of the front panel test. A non-screen type radiographic film shall be exposed in a cardboard, or plastic film holder, through the front panel with an exposure time to produce a diffuse transmission density of 1.0 plus or minus 0.2. The developed film shall be examined for uniformity of opacity and for evidence of included foreign matter. Visible shadows or non-uniformity shall be cause for rejection.
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