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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Note that some approximation is involved in the use <strong>of</strong> such a table, since the<br />
values in the boxes are rounded <strong>of</strong>f to two significant figures. However, the<br />
errors involved are always less than 5 percent and, in general, are<br />
insignificant in actual practice.<br />
Further, a table like the one below obviously cannot include all source-film<br />
distances, because <strong>of</strong> limitations <strong>of</strong> space. However, in any one radiographic<br />
department, only a few source-film distances are used in the great bulk <strong>of</strong> the<br />
work, and a table <strong>of</strong> reasonable size can be constructed involving only these<br />
few distances.<br />
Charlie Chong/ Fion Zhang
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