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Which of the following types of rays is used in radiography for the inspection of castings?(a) X- rays(b) Infrared rays(c) Ultraviolet rays(d) Visible raysI got this question in an interview for job.Question is from Non Destructive Testing in division Inspection Testing in Foundries of Casting-Forming-Welding I

Answer»

Correct answer is (a) X- rays

To explain I would say: Radiography uses X-rays, these rays penetrate through the castings and makes a shadow picture on a film which is placed BEHIND the material. These rays have a very SHORT wave length of the order of 0.001 Angstrom. And sometimes gamma rays are ALSO USED for the inspection of castings.



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