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What is used as the source of rays for radiography?

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What is used as the source of rays for radiography?

(a) Uranium-235

(b) Tellurium

(c) Cobalt-60

(d) Manganese dioxide

I had been asked this question during an online interview.

Enquiry is from Metal Composition Testing, Inspection of Materials in portion Testing of Materials, Foundry & Powder Metallurgy of Engineering Material & Metallurgy

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Right option is (c) Cobalt-60

For explanation I would say: Radiography is done by exposing the components to short wavelength radiation in the form of x-rays or gamma-rays. These rays are derived from a source like an x-ray tube or cobalt-60.

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