Exam code: H556
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
Was this exam question helpful?
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
Was this exam question helpful?
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.
Was this exam question helpful?
The graph shows the variation of X-ray intensity with wavelength emitted from two X-ray tubes, P and Q.
Which of the following statements is/are correct?
1 A higher potential difference is applied across tube Q.
2 The same target material is used in both tube P and tube Q.
3 The intensity of the characteristic lines depends on the anode temperature.
1, 2 and 3
Only 1 and 2
Only 2 and 3
Only 1
Was this exam question helpful?