Filters used in radiographic x ray tubes are

107. Filters used in radiographic x-ray tubes are
generally composed of
(A) aluminum.
(B) copper.
(C) tin.
(D) lead.
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Filters are used in radiography to remove soft (low-
energy) radiation that contributes only to patient
dose. The filters are usually made of aluminum.
Equipment operating above 70 kVp must have
total filtration of 2.5 mm aluminum equivalent
To within what percentage of the SID must the
collimator light and actual irradiated area be
accurate?
(inherent + added). (Bushong, p 11)
Ans. A
108. The use of all of the following will function to
reduce patient dose except
Ans. C
109. Which of the following factors will affect both
the quality and the quantity of the primary
beam?
1. Half-value layer (HVL)
2. kV
3. mA
110. To within what percentage of the SID must the
collimator light and actual irradiated area be
accurate?
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Restriction of field size is one important method of
patient protection. However, the accuracy of the
Reviewer A&R
Question & Answer
28

Review Notes for the
RADIOGRAPHY EXAM Appleton
light field must be evaluated periodically as part of
a QA program. Guidelines for patient protection
state that the collimator light and actual irradiated
area must be accurate to within 2 percent of the
source-image distance. (Thompson et al, p 403)
Ans. A