LMRT-RADIOGRAPHY ESSENTIALS
EXAM 2025 QUESTIONS AND 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? - ANS Increase kVp by 30%
Which of the following (IR) system speeds will result in the lowest patient dose? - ANS Faster
speed IR system
What is the primary purpose of using gonad shields during radiography? - ANS Reduce the
likelihood of genetic effects
Contact & shadow are two types of gonad shield - ANS TRUE
When should gonad shields be used? - ANS 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: - ANS repeat exposures
The limited operator can reduce repeat exposures by: - ANS clearly instructing patients
How does x-ray beam restriction minimize patient exposure - ANS It limits the radiation field
to the area of interest
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,What is the device that allows the limited operator to vary the size of the radiation field -
ANS Collimator
How does filtration reduce patient exposure - ANS Removes longer wavelength photons
What is the National Council on Radiation Protection and Measurements (NCRP)
recommendation for the amount of total filtration - ANS 2.5mm Al Equivalent
What are the three principal methods used to protect limited operators from unnecessary
radiation exposure? - ANS 1. Time
2. Distance
3. Shielding
Which of the following is NOT a type of personnel radiation shielding? - ANS 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? - ANS Scattered radiation from the patient
What is the term from radiation that escapes from the x-ray tube housing? - ANS leakage
radiation
Why are limited operators prohibited from activities that result in direct exposure to the
primary x-ray beam? - ANS They are considered occupationally exposed individuals
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, Distance, as a method used to limit operator exposure, means that: - ANS 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 -
ANS scatter radiation
Which of the following is an acronym for a common type of personnel dosimeter - ANS TLD
What is the recommended placement for a personnel dosimeter on the body of the limited
operator - ANS 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 -
ANS 5.0 rem (0.05 severt)
What is the NCRP recommended monthly effective (or equivalent) dose limit to the fetus for a
prego worker? - ANS 0.05 rem (0.0005 Sv)
Radiation monitoring of personnel is required when what percentage of the annual
occupational effective dose limit is likely to be received - ANS 10%
What is the conventional (British system) radiation unit to express radiation intensity in air? -
ANS Roentgen
The conventional unit commonly used to report occupational dose to radiation workers in the
U.S. is the: - ANS rem
What is the conventional (British system) radiation unit of absorbed dose - ANS Rad
3 Copyright ©2025 SIRJOEL ALL RIGHTS RESERVED
EXAM 2025 QUESTIONS AND 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? - ANS Increase kVp by 30%
Which of the following (IR) system speeds will result in the lowest patient dose? - ANS Faster
speed IR system
What is the primary purpose of using gonad shields during radiography? - ANS Reduce the
likelihood of genetic effects
Contact & shadow are two types of gonad shield - ANS TRUE
When should gonad shields be used? - ANS 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: - ANS repeat exposures
The limited operator can reduce repeat exposures by: - ANS clearly instructing patients
How does x-ray beam restriction minimize patient exposure - ANS It limits the radiation field
to the area of interest
1 Copyright ©2025 SIRJOEL ALL RIGHTS RESERVED
,What is the device that allows the limited operator to vary the size of the radiation field -
ANS Collimator
How does filtration reduce patient exposure - ANS Removes longer wavelength photons
What is the National Council on Radiation Protection and Measurements (NCRP)
recommendation for the amount of total filtration - ANS 2.5mm Al Equivalent
What are the three principal methods used to protect limited operators from unnecessary
radiation exposure? - ANS 1. Time
2. Distance
3. Shielding
Which of the following is NOT a type of personnel radiation shielding? - ANS 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? - ANS Scattered radiation from the patient
What is the term from radiation that escapes from the x-ray tube housing? - ANS leakage
radiation
Why are limited operators prohibited from activities that result in direct exposure to the
primary x-ray beam? - ANS They are considered occupationally exposed individuals
2 Copyright ©2025 SIRJOEL ALL RIGHTS RESERVED
, Distance, as a method used to limit operator exposure, means that: - ANS 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 -
ANS scatter radiation
Which of the following is an acronym for a common type of personnel dosimeter - ANS TLD
What is the recommended placement for a personnel dosimeter on the body of the limited
operator - ANS 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 -
ANS 5.0 rem (0.05 severt)
What is the NCRP recommended monthly effective (or equivalent) dose limit to the fetus for a
prego worker? - ANS 0.05 rem (0.0005 Sv)
Radiation monitoring of personnel is required when what percentage of the annual
occupational effective dose limit is likely to be received - ANS 10%
What is the conventional (British system) radiation unit to express radiation intensity in air? -
ANS Roentgen
The conventional unit commonly used to report occupational dose to radiation workers in the
U.S. is the: - ANS rem
What is the conventional (British system) radiation unit of absorbed dose - ANS Rad
3 Copyright ©2025 SIRJOEL ALL RIGHTS RESERVED
