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  X-ray Diffraction     1 of 7

As an x-ray beam travels through any substance, its intensity decreases with the distance traveled through the substance. The mathematical definition for this is expanded here.

Only a small range of characteristic x-rays are widely used for diffraction. Their Ka lines are used. The Kb line which is always present with Ka, at a slightly shorter wavelength, is filtered out using an absorbing film.

Have a go imageInvestigate the effect of sample thickness on the absorption of four x-rays in different samples using the simulation opposite.

The effective penetration of these x-rays determines the maximum thickness of specimens which can usefully be studied by x-ray diffraction.

Questions image(1) Determine using the simulation, the absorption of all 4 x-rays in 15 mm of Cr. Explain the results.

(2) Which of these statements regarding the thickness of samples and the wavelength of the x-ray beam is always true for x-ray diffraction?

X-rays with higher wavelengths require thinner samples to be used.

Specimens with a low density allow thicker samples to be used.



 Introduction  | Geometry | Intensity | X-ray Diffraction | Electron Diffraction 


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