Chapter 35 Flashcards
If a technologist is exposed to 4 mGy/hr for 45 minutes during a fluoroscopy exam, what will her total exposure be?
3 mGy
The NCRP is the:
National Council of Radiation Protection
When using the inverse square law during fluoroscopy, the patient should be considered a/an _____________ source of radiation.
point
Exposure is measured by multiplying ______________ by ________________.
exposure rate, exposure time
The best approach to manage occupational radiation exposure is to:
Follow the concept of ALARA
T/F: Effective dose is the equivalent to whole-body dose.
True
The first radiation health physicists worked with:
the atom bomb
T/F: Dose to an individual is directly related to technique used, not to duration of exposure.
False
Health physics is concerned with minimizing radiation dose to:
a. radiation physicists
b. all of the above
c. the public
d. radiation workers
b. all of the above
T/F: TVL is defined as the thickness of absorber that reduces radiation intensity to 1/8th its original value.
False
If a technologist is receiving2 mGy/hr standing 1 foot from the patient during fluoroscopy what is his rate of exposure when he steps back to a; distance of 2 feet from the patient?
.50 mGy/hr
The three cardinal principals of radiation protection involve:
time, distance and shielding
T/F: he concept of effective dose accounts for the relative radiosensitivity of various tissues and organs.
True
T/F: Equivalent whole-body dose is the weighted average of the radiation dose to various organs and tissues.
True
The assumed constant Kilovolt Peak for diagnostic imaging is?
100 kVp
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.
1.8 m (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.
