Understanding NRT- Reading 1- 2 of 2- Radiogaphic Testing A
Understanding nrt reading 1- 2 of 2- radiogaphic testing a
Understanding nrt reading 1- 2 of 2- radiogaphic testing a
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Packaged film is also available in rolls, which allows the radiographer to cut<br />
the film to any length. The ends <strong>of</strong> the packaging are sealed with electrical<br />
tape in the darkroom. In applications such as the radiography <strong>of</strong><br />
circumferential welds and the examination <strong>of</strong> long joints on an aircraft<br />
fuselage, long lengths <strong>of</strong> film <strong>of</strong>fer great economic advantage. The film is<br />
wrapped around the outside <strong>of</strong> a structure and the radiation source is<br />
positioned on axis inside allowing for examination <strong>of</strong> a large area with a single<br />
exposure.<br />
Envelope packaged film can be purchased with the film sandwiched between<br />
two lead oxide screens. The screens function to reduce scatter radiation at<br />
energy levels below 150kV and as intensification screens above 150 kV.<br />
Charlie Chong/ Fion Zhang
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