The intensity of a beam of X-rays incident on material P is 
.
The beam passes through 0.50 cm of material P and 0.50 cm of material Q.
The absorption (attenuation) coefficients of P and Q are 0.60 cm–1 and 0.20 cm–1 respectively. The intensity of the beam after passing through both P and Q is 
.
What is the value of n?
0.67
0.74
0.82
0.90
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There are four important attenuation mechanisms by which X-ray photons may interact when they pass through matter.
In which mechanism is the X-ray photon scattered with a longer wavelength?
simple scattering
Compton effect
pair production
photoelectric effect
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A contrast material is used while taking an X-ray image of a patient. Which statement is correct?
Iodine is a contrast material.
Technetium is a contrast material.
A contrast material must have a short half-life.
A contrast material is used for acoustic matching.
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