LMRT-Radiography Essentials with 209
Questions and answers Updated 2025 100%
PASS
Which of the following changes in (KVP) will result in the greatest reduction of patient dose, when (MAS) is
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
adjusted to compensate for the change? - Correct Answers Increase kVp by 30%
III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! Which of the following (IR) system speeds will result in the lowest patient dose? - Correct Answers Faster
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! speed IR system III! III!
III! What is the primary purpose of using gonad shields during radiography? - Correct Answers Reduce the
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! likelihood of genetic effects III! III! III!
III! Contact & shadow are two types of gonad shield - Correct Answers TRUE
III! III! III! III! III! III! III! III! III! III! III! III! III!
III! When should gonad shields be used? - Correct Answers When the gonads are within 5cm of the radiation
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! field
III! The greatest cause of unnecessary radiation to patients that can be controlled by the limited operator are: -
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! Correct Answers repeat exposures III! III! III!
III! The limited operator can reduce repeat exposures by: - Correct Answers clearly instructing patients
III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! How does x-ray beam restriction minimize patient exposure - Correct Answers It limits the radiation field to
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! the area of interest
III! III! III!
III! What is the device that allows the limited operator to vary the size of the radiation field - Correct Answers
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! Collimator
,III! How does filtration reduce patient exposure - Correct Answers Removes longer wavelength photons
III! III! III! III! III! III! III! III! III! III! III! III! III!
III! What is the National Council on Radiation Protection and Measurements (NCRP) recommendation for the
III! III! III! III! III! III! III! III! III! III! III! III! III!
III! amount of total filtration - Correct Answers 2.5mm Al Equivalent
III! III! III! III! III! III! III! III! III! III!
III! What are the three principal methods used to protect limited operators from unnecessary radiation
III! III! III! III! III! III! III! III! III! III! III! III! III!
III! exposure? - Correct Answers 1. Time III! III! III! III! III! III!
2. DistanceIII! III!
3. Shielding
III!
III! Which of the following is NOT a type of personnel radiation shielding? - Correct Answers a. Apron
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
b. Glove III!
c. Thyroid shield
III! III!
d. Shadow******** CORRECT
III! III!
III! Personnel shielding must be worn on the rare occasion during which the limited operator may need to III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! remain in the radiographic room during an exposure to assist the patient in maintaining the proper position.
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! What is the source of the greatest radiation hazard under this circumstance? - Correct Answers Scattered
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! radiation from the patient III! III! III!
III! What is the term from radiation that escapes from the x-ray tube housing? - Correct Answers leakage
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! radiation
III! Why are limited operators prohibited from activities that result in direct exposure to the primary x-ray
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! beam? - Correct Answers They are considered occupationally exposed individuals
III! III! III! III! III! III! III! III! III! III!
III! Distance, as a method used to limit operator exposure, means that: - Correct Answers the operator should
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! maximize the distance from the source during an exposure. III! III! III! III! III! III! III! III!
III! Shielding worn for personnel protection is designed to attenuate what source of exposure - Correct Answers
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! scatter radiation III!
, III! Which of the following is an acronym for a common type of personnel dosimeter - Correct Answers TLD
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! What is the recommended placement for a personnel dosimeter on the body of the limited operator -
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! Correct Answers The badge should be worn in the region of the collar on the anterior surface of the body and
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! outside the lead apron if worn. III! III! III! III! III!
III! What is the NCRP recommended annual effective dose limit for occupational exposure - Correct Answers 5.0
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! rem (0.05 severt) III! III!
III! What is the NCRP recommended monthly effective (or equivalent) dose limit to the fetus for a prego worker?
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! - Correct Answers 0.05 rem (0.0005 Sv)
III! III! III! III! III! III! III!
III! Radiation monitoring of personnel is required when what percentage of the annual occupational effective
III! III! III! III! III! III! III! III! III! III! III! III! III!
III! dose limit is likely to be received - Correct Answers 10%
III! III! III! III! III! III! III! III! III! III! III!
III! What is the conventional (British system) radiation unit to express radiation intensity in air? - Correct
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! Answers Roentgen III!
III! The conventional unit commonly used to report occupational dose to radiation workers in the U.S. is the: -
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! Correct Answers rem III! III!
III! What is the conventional (British system) radiation unit of absorbed dose - Correct Answers Rad
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! According to the Bergonie Tribondeau law, which of the following types of cells are most radiosensitive? -
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! Correct Answers Embryonic tissue cells III! III! III! III!
III! Which type of x-ray photon interaction with the body is primarily responsible for the radiation dose
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! absorbed by the pt? - Correct Answers Photoelectric III! III! III! III! III! III! III! III!
III! What is the (NCRP) recommendation for lead equivalency of aprons used for personnel protection? -
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! Correct Answers 0.5 mm III! III! III!
Questions and answers Updated 2025 100%
PASS
Which of the following changes in (KVP) will result in the greatest reduction of patient dose, when (MAS) is
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
adjusted to compensate for the change? - Correct Answers Increase kVp by 30%
III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! Which of the following (IR) system speeds will result in the lowest patient dose? - Correct Answers Faster
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! speed IR system III! III!
III! What is the primary purpose of using gonad shields during radiography? - Correct Answers Reduce the
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! likelihood of genetic effects III! III! III!
III! Contact & shadow are two types of gonad shield - Correct Answers TRUE
III! III! III! III! III! III! III! III! III! III! III! III! III!
III! When should gonad shields be used? - Correct Answers When the gonads are within 5cm of the radiation
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! field
III! The greatest cause of unnecessary radiation to patients that can be controlled by the limited operator are: -
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! Correct Answers repeat exposures III! III! III!
III! The limited operator can reduce repeat exposures by: - Correct Answers clearly instructing patients
III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! How does x-ray beam restriction minimize patient exposure - Correct Answers It limits the radiation field to
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! the area of interest
III! III! III!
III! What is the device that allows the limited operator to vary the size of the radiation field - Correct Answers
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! Collimator
,III! How does filtration reduce patient exposure - Correct Answers Removes longer wavelength photons
III! III! III! III! III! III! III! III! III! III! III! III! III!
III! What is the National Council on Radiation Protection and Measurements (NCRP) recommendation for the
III! III! III! III! III! III! III! III! III! III! III! III! III!
III! amount of total filtration - Correct Answers 2.5mm Al Equivalent
III! III! III! III! III! III! III! III! III! III!
III! What are the three principal methods used to protect limited operators from unnecessary radiation
III! III! III! III! III! III! III! III! III! III! III! III! III!
III! exposure? - Correct Answers 1. Time III! III! III! III! III! III!
2. DistanceIII! III!
3. Shielding
III!
III! Which of the following is NOT a type of personnel radiation shielding? - Correct Answers a. Apron
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
b. Glove III!
c. Thyroid shield
III! III!
d. Shadow******** CORRECT
III! III!
III! Personnel shielding must be worn on the rare occasion during which the limited operator may need to III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! remain in the radiographic room during an exposure to assist the patient in maintaining the proper position.
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! What is the source of the greatest radiation hazard under this circumstance? - Correct Answers Scattered
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! radiation from the patient III! III! III!
III! What is the term from radiation that escapes from the x-ray tube housing? - Correct Answers leakage
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! radiation
III! Why are limited operators prohibited from activities that result in direct exposure to the primary x-ray
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! beam? - Correct Answers They are considered occupationally exposed individuals
III! III! III! III! III! III! III! III! III! III!
III! Distance, as a method used to limit operator exposure, means that: - Correct Answers the operator should
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! maximize the distance from the source during an exposure. III! III! III! III! III! III! III! III!
III! Shielding worn for personnel protection is designed to attenuate what source of exposure - Correct Answers
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! scatter radiation III!
, III! Which of the following is an acronym for a common type of personnel dosimeter - Correct Answers TLD
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! What is the recommended placement for a personnel dosimeter on the body of the limited operator -
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! Correct Answers The badge should be worn in the region of the collar on the anterior surface of the body and
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! outside the lead apron if worn. III! III! III! III! III!
III! What is the NCRP recommended annual effective dose limit for occupational exposure - Correct Answers 5.0
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! rem (0.05 severt) III! III!
III! What is the NCRP recommended monthly effective (or equivalent) dose limit to the fetus for a prego worker?
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! - Correct Answers 0.05 rem (0.0005 Sv)
III! III! III! III! III! III! III!
III! Radiation monitoring of personnel is required when what percentage of the annual occupational effective
III! III! III! III! III! III! III! III! III! III! III! III! III!
III! dose limit is likely to be received - Correct Answers 10%
III! III! III! III! III! III! III! III! III! III! III!
III! What is the conventional (British system) radiation unit to express radiation intensity in air? - Correct
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! Answers Roentgen III!
III! The conventional unit commonly used to report occupational dose to radiation workers in the U.S. is the: -
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! Correct Answers rem III! III!
III! What is the conventional (British system) radiation unit of absorbed dose - Correct Answers Rad
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! According to the Bergonie Tribondeau law, which of the following types of cells are most radiosensitive? -
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! Correct Answers Embryonic tissue cells III! III! III! III!
III! Which type of x-ray photon interaction with the body is primarily responsible for the radiation dose
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! absorbed by the pt? - Correct Answers Photoelectric III! III! III! III! III! III! III! III!
III! What is the (NCRP) recommendation for lead equivalency of aprons used for personnel protection? -
III! III! III! III! III! III! III! III! III! III! III! III! III! III! III!
III! Correct Answers 0.5 mm III! III! III!
