A-A-51938A
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 39 inches onto a concrete or tile 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, will constitute a failure. After the drop test, the sample cassette shall be subjected to and pass the flatness test, lightproof test, and film contact 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 feeler gages between the flat surface and the frame. The deviation from flatness of the front panel shall be determined by measuring the maximum distance between the front face and a straight edge placed at various angles on the front panel. The damaged corners resulting from the drop test shall not be placed on a flat test surface, and shall not be measured. Both frame and front panel shall be flat within 1/16 inch. Any deviation will constitute a failure.
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.
Lightproof test. A high speed radiographic film, of the applicable size, shall be placed in the cassette, and all sides and edges of the cassette shall be exposed to a 100 watt incandescent lamp, operated at its rated voltage, at a distance of 3.3 feet (1 meter) from the cassette for a period of ten minutes. The developed test film shall be compared with a developed, unexposed film of the same lot. A density on the test film greater than that on unexposed film shall be cause for rejection. When viewed against the illuminator, the test film shall show no density variations, except that fog within 1/8 inch
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