If a patient received 0.02 Gy during a 10-minute fluoroscopic examination, what was the dose rate?
A 0.2 mGy/min B 2.0 mGy/min C 5 mGy/min D 200 mGy/min
B 2.0 mGy/min
The annual dose limit for medical imaging personnel includes radiation from
- occupational exposure
- background radiation
- medical x-rays
A 1 only B 1 and 2 only C 2 and 3 only D 1, 2, and 3
A 1 only
Q 231.48:The most efficient type of male gonadal shielding for use during fluoroscopy is
A flat contact
B shaped contact (contour)
C shadow
D cylindrical
B shaped contact (contour)
The x-ray unit of exposure defines which of the following?
A Sievert
B air kerma
C Gyt
D Becqueral
air kerma
What is the minimum requirement for lead aprons, according to 21 CFR?
A 0.05 mm Pb B 0.50 mm Pb C 0.25 mm Pb D 1.0 mm Pb
0.25 mm Pb
If a patient received 0.02 Gy during a 10-minute fluoroscopic examination, what was the dose rate?
A 0.2 mGy/min B 2.0 mGy/min C 5 mGy/min D 200 mGy/min
2.0 mGy/min
What is the annual TEDE limit for radiation workers?
A 5 mSv B 500 mSv C 5,000 mSv D 50 mSv
D 50 mSv
Radiation output from a diagnostic x-ray tube is measured in which of the following units of measurement?
A Gyt B Sv C Gya D Bq
Gya
How much protection is provided from a 100-kVp x-ray beam when using a 0.50-mm lead-equivalent apron?
A 40% B 75% C 88% D 99%
75%
According to NCRP regulations, leakage radiation from the x-ray tube must not exceed
A 10 mGya/hr B 1 mGya/hr C 10 mGya/min D 1 mGya/min
B 1 mGya/hr
The measure of the rate at which energy is transferred from ionizing radiation to soft tissue is termed
A the characteristic effect B Compton scatter C linear energy transfer D the photoelectric effect
C linear energy transfer
If the exposure rate to an individual standing 7.0 feet from a source of radiation is 0.5 mGy/hr, what will be the dose received after 20 minutes at a distance of 3.0 feet from the source?
A 0.07 mGy B 0.21 mGy C 0.90 mGy D 2.72 mGy
B 0.90 mGy
With milliamperes (mA) increased to maintain fluoroscopic output intensity, how is the ESE affected as the source-to-skin distance (SSD) is increased?
A The ESE increases. B The ESE decreases. C The ESE remains unchanged. D ESE is unrelated to SSD.
B The ESE decreases.
What is the established annual occupational dose-equivalent limit for the lens of the eye?
A 10 mSv B 50 mSv C 150 mSv D 250 mSv
150
What is the approximate entrance skin exposure (ESE) for the average AP pelvis radiograph?
A 0.1 mGy B 1.5 mGy C 3.0 mGy D 4.0 mGy
1.5