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Method:

 

Part 1.

The first step involves the setting-up of the x-ray field. The lead cylinder is placed in the central ray beam on Perspex. The Perspex should be 5cm in thickness. On top of the Perspex, a cassette is placed, and the beam opened to 5 by 5cm. The exposure is set at 70kVp and 12mAs. The cassette is then identified using the SYSTEM DIAGNOSIS GENRAD setting.  After the field is set, the cassette is the exposed and scanned using the CR equipment. The exposure and scanning are then repeated with the field adjusted to 10 x 10, 15 x 15 and 20 x 20 cm. The results are then recorded in a table.

Part 2.

The 5cm thick Perspex is placed in the path of the x-ray beam. The cassette, in this case, is placed along the side of the Perspex in a vertical orientation and not under the Perspex. The x-rat is collimated to a standard area of 17 by 17cm in such a way that the entire primary beam is confined to the Perspex. The exposure is then set at 70 kVp, 40 mAs, 100 SID with the distance between the table and the x-ray tube remaining constant. At this point, the cassette is exposed, scanned and developed. The same procedure is repeated with the cassette being 5cm and 10cm above the Perspex.

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