LMRT-Radiography Essentials exam with correct
answers
Which of the following changes in (KVP) will result in the greatest reduction of
patient dose, when (MAS) is adjusted to compensate for the change? - CORRECT
ANSWERS ✔✔Increase kVp by 30%
Which of the following (IR) system speeds will result in the lowest patient dose? -
CORRECT ANSWERS ✔✔Faster speed IR system
What is the primary purpose of using gonad shields during radiography? - CORRECT
ANSWERS ✔✔Reduce the likelihood of genetic effects
Contact & shadow are two types of gonad shield - CORRECT ANSWERS ✔✔TRUE
When should gonad shields be used? - CORRECT ANSWERS ✔✔When the gonads
are within 5cm of the radiation field
The greatest cause of unnecessary radiation to patients that can be controlled by the
limited operator are: - CORRECT ANSWERS ✔✔repeat exposures
The limited operator can reduce repeat exposures by: - CORRECT ANSWERS
✔✔clearly instructing patients
How does x-ray beam restriction minimize patient exposure - CORRECT ANSWERS
✔✔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 - CORRECT ANSWERS ✔✔Collimator
How does filtration reduce patient exposure - CORRECT ANSWERS ✔✔Removes
longer wavelength photons
What is the National Council on Radiation Protection and Measurements (NCRP)
recommendation for the amount of total filtration - CORRECT ANSWERS
✔✔2.5mm Al Equivalent
What are the three principal methods used to protect limited operators from
unnecessary radiation exposure? - CORRECT ANSWERS ✔✔1. Time
2. Distance
3. Shielding
Which of the following is NOT a type of personnel radiation shielding? - CORRECT
ANSWERS ✔✔a. Apron
b. Glove
c. Thyroid shield
d. Shadow******** CORRECT
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 to assist
the patient in maintaining the proper position. What is the source of the greatest
radiation hazard under this circumstance? - CORRECT ANSWERS ✔✔Scattered
radiation from the patient
, What is the term from radiation that escapes from the x-ray tube housing? -
CORRECT ANSWERS ✔✔leakage radiation
Why are limited operators prohibited from activities that result in direct exposure to
the primary x-ray beam? - CORRECT ANSWERS ✔✔They are considered
occupationally exposed individuals
Distance, as a method used to limit operator exposure, means that: - CORRECT
ANSWERS ✔✔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 - CORRECT ANSWERS ✔✔scatter radiation
Which of the following is an acronym for a common type of personnel dosimeter -
CORRECT ANSWERS ✔✔TLD
What is the recommended placement for a personnel dosimeter on the body of the
limited operator - CORRECT ANSWERS ✔✔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 - CORRECT ANSWERS ✔✔5.0 rem (0.05 severt)
What is the NCRP recommended monthly effective (or equivalent) dose limit to the
fetus for a prego worker? - CORRECT ANSWERS ✔✔0.05 rem (0.0005 Sv)
answers
Which of the following changes in (KVP) will result in the greatest reduction of
patient dose, when (MAS) is adjusted to compensate for the change? - CORRECT
ANSWERS ✔✔Increase kVp by 30%
Which of the following (IR) system speeds will result in the lowest patient dose? -
CORRECT ANSWERS ✔✔Faster speed IR system
What is the primary purpose of using gonad shields during radiography? - CORRECT
ANSWERS ✔✔Reduce the likelihood of genetic effects
Contact & shadow are two types of gonad shield - CORRECT ANSWERS ✔✔TRUE
When should gonad shields be used? - CORRECT ANSWERS ✔✔When the gonads
are within 5cm of the radiation field
The greatest cause of unnecessary radiation to patients that can be controlled by the
limited operator are: - CORRECT ANSWERS ✔✔repeat exposures
The limited operator can reduce repeat exposures by: - CORRECT ANSWERS
✔✔clearly instructing patients
How does x-ray beam restriction minimize patient exposure - CORRECT ANSWERS
✔✔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 - CORRECT ANSWERS ✔✔Collimator
How does filtration reduce patient exposure - CORRECT ANSWERS ✔✔Removes
longer wavelength photons
What is the National Council on Radiation Protection and Measurements (NCRP)
recommendation for the amount of total filtration - CORRECT ANSWERS
✔✔2.5mm Al Equivalent
What are the three principal methods used to protect limited operators from
unnecessary radiation exposure? - CORRECT ANSWERS ✔✔1. Time
2. Distance
3. Shielding
Which of the following is NOT a type of personnel radiation shielding? - CORRECT
ANSWERS ✔✔a. Apron
b. Glove
c. Thyroid shield
d. Shadow******** CORRECT
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 to assist
the patient in maintaining the proper position. What is the source of the greatest
radiation hazard under this circumstance? - CORRECT ANSWERS ✔✔Scattered
radiation from the patient
, What is the term from radiation that escapes from the x-ray tube housing? -
CORRECT ANSWERS ✔✔leakage radiation
Why are limited operators prohibited from activities that result in direct exposure to
the primary x-ray beam? - CORRECT ANSWERS ✔✔They are considered
occupationally exposed individuals
Distance, as a method used to limit operator exposure, means that: - CORRECT
ANSWERS ✔✔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 - CORRECT ANSWERS ✔✔scatter radiation
Which of the following is an acronym for a common type of personnel dosimeter -
CORRECT ANSWERS ✔✔TLD
What is the recommended placement for a personnel dosimeter on the body of the
limited operator - CORRECT ANSWERS ✔✔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 - CORRECT ANSWERS ✔✔5.0 rem (0.05 severt)
What is the NCRP recommended monthly effective (or equivalent) dose limit to the
fetus for a prego worker? - CORRECT ANSWERS ✔✔0.05 rem (0.0005 Sv)
