Radiography Essentials Study Guide exam with 100-correct answers
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Course
Radiography
Institution
Radiography
The following statements are correct regarding the link between radiation dose and genetic effects.
The link has been demonstrated in animal studies and increased risk to humans cannot be predicted with respect to an individual.
Which changes in kilo-voltage (KVP) will result in the greates...
Radiography Essentials Study Guide exam
with 100%correct answers
The following statements are correct regarding the link between radiation dose
and genetic effects. - ANSWER-The link has been demonstrated in animal studies
and increased risk to humans cannot be predicted with respect to an individual.
Which changes in kilo-voltage (KVP) will result in the greatest reduction of patient
dose, when milliampre-seconds (mAs) is adjusted to compensate for the change.
- ANSWER-Increase kVp by 30%
Which image receptor (IR) system speeds will result in the lowest patient dose? -
ANSWER-Faster-speed IR system
What is the primary purpose of using gonad shields during radiography? -
ANSWER-Reducing the likelihood of genetic effects
The following are types of gonad shield. - ANSWER-Contact shield, Shadow
shield
When should gonad shielding be used? - ANSWER-When the gonads are within 5
cm of the radiation field
The greatest cause of unnecessary radiation to patients that can be controlled by
the limited operator is - ANSWER-repeat exposure
The limited operator can reduce repeat exposure by: - ANSWER-clearly
instructing the patient
How does x-ray beam restriction minimize patient exposure? - ANSWER-It limits
the radiation field to the area of interest
What is the device that allows the limited operator to vary the size of the radiation
field? - ANSWER-Collimator
, How does filtration reduce patient exposure? - ANSWER-Removes longer-
wavelength photons
What is the national Council on Radiation Protection Measurement (NCRP)
recommendation for the amount of total filtration? - ANSWER-2.5 mm Al equiv
What are the three principal methods used to protect limited operators from
unnecessary radiation exposure? - ANSWER-Time, distance, and shielding
__________ is not a type of personnel radiation shielding? - ANSWER-Shadow
Personnel shielding must be worn on the rare occasion during which the Limited
operator may need to remain in the radiographic room during an exposure.
What is the source of the greatest radiation hazard under this circumstance? -
ANSWER-Scatter radiation from the patient
What is the term for radiation that escapes from the x-ray tube housing? -
ANSWER-Leakage radiation
Why are limited operators prohibited from activities that result in the direct
exposure to the primary x-ray beam? - ANSWER-They are considered
occupationally exposed individuals
Distance, as a method used to limited operator exposure,means that: - ANSWER-
The operator should maximize the distance from the source during an exposure.
Shielding worn for personnel protection is designed to attenuate what source of
exposure? - ANSWER-Scatter radiation
Which is an acronym for a common type of personnel dosimeter? - ANSWER-TLD
What is the recommended placement for a personnel for a personnel dosimeter
on the body of the limited operator - ANSWER-The badge should be worn in the
region of the collar on the anterior surface of the body and outside the lead
apron, if worn
What is the NCRP recommended annual effective dose limit for occupational
exposure? - ANSWER-5.0 rem (0.05 Sv)
What is the NCRP recommended monthly effective (or equivalent) dose limit to
the fetus for a pregnant worker? - ANSWER-0.05 rem (0.0005 Sv)
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