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The x-ray film showing light and dark areas is known as _________

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The x-ray film showing light and dark areas is known as _________

(a) Quantograph

(b) Exograph

(c) Wilbur’s film

(d) Smith’s film

This question was addressed to me in class test.

My doubt stems from Metal Composition Testing, Inspection of Materials topic in chapter Testing of Materials, Foundry & Powder Metallurgy of Engineering Material & Metallurgy

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Correct option is (b) Exograph

Easiest explanation: Most defects such as blow holes, porosity, cracks etc., possess less density than the sound of metal casting. As a result, they transmit x-rays better than the sound metal does. This gives the film a dark appearance where the defects are present. The exposed and developed x-ray film showing light and dark areas is termed as a radiograph or an exograph.

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