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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Chapter 6: Radio Isotope (Gamma) Sources<br />
Emitted gamma radiation is one <strong>of</strong> the three types <strong>of</strong> natural radioactivity. It is<br />
the most energetic form <strong>of</strong> electromagnetic radiation, with a very short<br />
wavelength <strong>of</strong> less than one-tenth <strong>of</strong> a nano-meter. Gamma rays are<br />
essentially very energetic x-rays emitted by excited nuclei. They <strong>of</strong>ten<br />
accompany alpha or beta particles, because a nucleus emitting those<br />
particles may be left in an excited (higher-energy) state.<br />
In medicine gamma-ray sources are used to treat cancer, for diagnostic<br />
purposes, and to sterilize equipment and supplies. In industry they are used<br />
in the inspection <strong>of</strong> castings and welds and in food processing to kill<br />
microorganisms and retard spoilage.<br />
Charlie Chong/ Fion Zhang
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