X-ray radiography-Study Materials

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X-ray radiography-Study Materials

X-rays are produced by the Coolidge X-ray tubes. The penetrating power of X-rays is mainly depending on the anode voltage of-the X-ray tube. X-rays are obtained when the fast moving electrons are suddenly stopped by the metallic target (anode).

X-ray radiography -Study Material

Synopsis

  • X-ray diffraction & Bragg’s law
  • Crystal Imperfections
  • Radiographic methods
  • Law of absorption of X-rays or Gamma rays
  • X-ray Radiographic Technique

X-ray diffraction & Bragg’s law :

W.L. Bragg discovered that X-rays can be scattered or diffracted by cleavage planes of crystals when the X-rays are incident on their surface nearly at glancing angles. Glancing angle or Bragg angle is the angle b/w incident ray and crystal plane. Thus Bragg’s Law aims at devising the condition for X-rays diffracted by the crystal plane to cause constructive interference.

Radiographic methods :

Radiography is a non-destructive testing method and is defined by the formation of images on fluorescent screens or photographic material by short wavelength radiation such as X-rays and Gamma rays or by Nefuron beams or Electron beams.

Law of absorption of X-rays or Gamma rays

When X-rays or gamma rays pass through the material, the decrease in intensity *dl’ has been found to be proportional to the intensity T of the incident radiation and penetrated distance ‘dt’ through the material. ∴ dI = -μIdt where ? is a constant of proportionality and the negative sign is used to indicate a decrease in intensity with respect to increase of penetrated distance.

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