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Which of the following types of rays is used in radiography for the inspection of castings?

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in Casting-Forming-Welding I by (687k points)
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 rays

I 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

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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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