Production of X-Rays Ch.3

Question 1

The x-rays produced by 10 MeV electrons travel:

A. Are mostly backscattered
B. At about 30 degrees to the target
C. At about 90 degrees to the target
D. In same general direction as the electrons

Answer 1

D. In same general direction as the electrons

Question 2

The efficiency of x-ray production in radiation therapy machines is less than:

A. 50%
B. 10%
C. 5%
D. 1%

Answer 2

D. 1%

Question 3

Photons produced by an x-ray machine at 80 kVp:

A. Are mostly monoenergetic
B. Have about 90% of the same energy
C. Have a distribution of energies
D. Have about 50% of the maximum energy

Answer 3

C. Have a distribution of energies

Question 4

The maximum energy of an x-ray photon from a 100 kVp unit is:

A. 50 keV
B. 10 keV
C. 100 keV
D. 1 keV

Answer 4

C. 100 keV

Question 5

The average energy in keV of a diagnostic x-ray beam is about:

A. 50% of the maximum kVp
B. 33% of the maximum kVp
C. 25 % of the maximum kVp
D. 20% of the maximum kVp

Answer 5

B. 33% of the maximum kVp

Question 6

The output of an x-ray beam increases as:

A. The tube voltage increases
B. The tube current increases
C. The atomic number (Z) of the target increases
D. All of the above

Answer 6

D. All of the above

Question 7

Heel effect of a diagnostic x-ray beam:

A. Depends on the angle of the x-ray target
B. Produces a variation in intensity in the x-ray beam parallel to the
cathode-anode axis
C. Results in a lower intensity at the anode end of the beam
D. All of the above

Answer 7

D. All of the above