Chapter 36 Flashcards
The assumed constant Kilovolt Peak for diagnostic imaging is?
100kVp
How tall must primary protective barriers be?
7’
The maximum variation in linearity is:
10%
Reproducibility of output intensity should be accurate to within:
5%
T/F: The quality control area of an imaging department would be considered an uncontrolled area.
False
The exposure switch for portable x-ray machines should be on a cord that is at least ___ long.
6’
Radiologic Technologists receive most of their occupational dose from:
fluoroscopic exams
The light localized variable aperture collimator must be accurate to within
2% of the SID.
Which type of dosimeter uses Lithium Fluoride (LiF) as its phosphor?
Thermoluminescent Dosimeter (TLD)
Primary protective barriers must consist of ______ “ of lead or _____ “ of masonry:
1/16
4
T/F: The two types of primary radiation are scatter and leakage.
False
T/F: In fluoroscopy, the x-ray beam intensity at the tabletop should not exceed 2.1 mR/min for each mA of operation at 80 kVp
True
The bucky slot cover should have a total lead equivalent of:
.25mm
T/F: A secondary barrier always has a use factor (U) of 1:
True
A cumulative timer in fluoroscopy should produce an audible or visual signal when _______ of cumulative beam on time has been reached.
5 minutes
Which of the following is not considered a type of gas-filled detector?
a. proportional counter
b. scintillation detector
c. Geiger-Muller counter
d. ionization chamber
b. scintillation detector
The level of radiation activity of a room best defines:
workload
The protective tube housing keeps leakage radiation to less than:
1 mGy/hr at 1 meter
The minimum SSD for stationary fluoroscopy is:
15”
Which of the following fall under the “frequent” level of occupancy?
1. corridors
2. work areas
3. waiting rooms
4. restrooms
1 and 4 only
The minimum amount of filtration for fluoroscopy is:
2.5 mm Al eq.
T/F: An optically stimulated luminescence (OSL) dosimeter can detect radiation doses as low as 1 mrem.
True
