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.  Investigate 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. |
|
(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?
