Radiography region absorbs less radiation & transmits more - Material Science

Q.  During radiography test, which region absorbs less radiation and transmits more?
- Published on 05 Aug 15

a. Low and high density regions absorb and transmit same amount of radiation
b. High density region
c. Low density region
d. None of the above

ANSWER: Low density region

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    Discussion

  • Sravanthi   -Posted on 07 Oct 15
    This method uses short wavelength electromagnetic radiations such as X-rays and γ rays to detect internal defects. In this method the component to be tested is placed in path of radiations caused due to X-rays or γ rays and a photographic film is placed on other side of the component. These radiations pass through component and get absorbed. The rays transmitted through test specimen fall on photographic film. Due to radiations the photographic film turns black and gets affected due to incident radiations.

    Dark film is obtained if lower density region of the component absorbs less radiation and transmits more. Similarly, if higher density region of the component absorbs more radiation, it transmits less thus making the part of film less dark.

    Hence, on photographic plate cracks appear as dark areas and inclusions appear as light region. This method is suitable for metals and nonmetals, any size shape of components. But the radiations caused due to this method are health hazardous and the equipment is costly. Cracks in welding joints and measurement of thickness can be done by this method.

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