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Air cooling is the most readily available means for keeping turbine blades from breaking or melting while the engine is running, and in order to get the most from the air streaming through the engine, turbine blades are cast with delicate cooling channels running through them. In the manufacturing process, though, these channels can become clogged. It's important that these defective blades be screened out as thoroughly as possible in quality assurance, and neutron radiography is the most effective nondestructive testing method for this purpose.
When Wilhelm Rontgen discovered X-rays in the 1890s, he almost immediately discovered the imaging applications of this hitherto-unknown type of radiation, and experts in the medical community and the industrial nondestructive testing community rapidly seized on the potential this new science of radiography offered.
