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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Because <strong>of</strong> safety issues source materials are regulated by Federal or State<br />
jurisdictions. The Nuclear Regulation Commission (NRC) has developed and<br />
enforces regulations for source material. The commission allows states to<br />
regulate materials if they follow guidelines <strong>of</strong> the commission. These states<br />
are identified as "Agreement States". In either case, obtaining and<br />
maintaining a license is a costly and well regulated process that protects<br />
workers and the public from the hazards <strong>of</strong> gamma radiation.<br />
Typically gamma radiography is used for inspection <strong>of</strong> castings and<br />
weldments. However, other techniques and applications are being developed.<br />
Pr<strong>of</strong>ile radiography is one example. Pr<strong>of</strong>ile radiography is used for corrosion<br />
under insulation. Exposures are made <strong>of</strong> a small section <strong>of</strong> the pipe wall. A<br />
cooperator block such as a Ricki T is used to calculate the blowout factor for<br />
the exposure in order to calculate the remaining wall thickness <strong>of</strong> the pipe.<br />
The exposure source is usually iridium-192, with cobalt-60 used for the pipes<br />
<strong>of</strong> heavier wall.<br />
Charlie Chong/ Fion Zhang
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