Download LMRT State Review Exam Questions and Answers: Radiation Safety and Protection and more Exams Nursing in PDF only on Docsity!
Answers 2025
Which of the following statements are correct regarding the link between radiation dose and genetic effects?
- The link has been demonstrated in human studies.
- The link has been demonstrated in animal studies.
- increased risk to humans cannot be predicted with respect to an individual. - CORRECT ANSWER ✔✔2 and 3 only Which of the following changes in kilovoltage (KVP) will result in the greatest reduction of patient dose, when milliamperage-seconds (mAs) is adjusted to compensate for the dosage? A.) Decrease kVp by 30% B.) Decrease kVp by 15% C.) Increase kVp by 15% D.) Increase kVp by 30% - CORRECT ANSWER ✔✔Increase kVp by 30% Which of the following image receptor (IR) system speeds will result in the lowest patient dose? A.) slower speed IR system B.) Faster speed IR system C.) It does not matter; the IR system speed does not affect the patient dose. - CORRECT ANSWER ✔✔Faster speed IR system
Answers 2025
What is the primary purpose of using gonad shields during radiography? A.) Reduce the likelihood of genetic changes B.) Reduce likelihood of somatic effects C.) Protect patient modesty D.) Demonstrate the location of the gonads in the image - CORRECT ANSWER ✔✔Reduce the likelihood of genetic changes Which one of the following are types of gonad shields?
- Aperture
- Contact
- Shadow A.) 1 and 2 only B.) 1 and 3 only C.) 2 and 3 only D.) 1, 2, and 3 - CORRECT ANSWER ✔✔2 and 3 only When should gonad shielding be used? A.) for all patients B.) For all procedures C.) when the gonads are within 10 cm of the radiation field
Answers 2025
D.) It limits repeat exposure - CORRECT 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? A.) Collimator B.) Detent C.) Filter D.) Sheild - CORRECT ANSWER ✔✔Collimator How does filtration reduce patient exposure? A.) Removes the shorter-wavelength photons B.) Removes longer wavelength photons C.) Reduces the size of the radiation field D.) Reduces the time of exposure - CORRECT ANSWER ✔✔Removes longer wavelength photons What is the National Council on Radiation Protection and Measurements (NCRP) recommendation for the amount of total filtration? A.) 0.5mm aluminum equivalent ( AL Equiv) B.) 1.5mm AL Equiv
Answers 2025
C.) 2.5mm Al Equiv D.) 3.5mm Al Equiv - CORRECT ANSWER ✔✔2.5mm Al Equiv What are the three principal methods used to protect limited operators from unnecessary radiation exposure? A. Time, Distance, and Shielding B.) Time, Distance, and Collimation C.) Distance, Collimation, and Shielding D.) Time, Collimation, and Filtration - CORRECT ANSWER ✔✔Time, Distance, and Shielding Which of the following is not a type of personnel radiation shielding? A.) Apron B.) Glove C.) Thyroid Shield D.) Shadow - CORRECT 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 the exposure to assist the patient in maintaining the proper position. What is the source of the greatest radiation hazard under this circumstance?
Answers 2025
A.) The operator should maximize the distance from the source during an exposure. B.) The operator should minimize the distance from the source during an exposure C.) The operator should maximize the distance from the patient during an exposure D.) The operator should minimize the distance from the patient during an exposure - CORRECT 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? A.) Primary radiation B.) Off-focus radiation C.) Leakage Radiation D.) Scatter radiation - CORRECT ANSWER ✔✔Scatter Radiation Which of the following is an acronym for a common type of personnel dosimeter? A.) TLC B.) TLD C.) OSD D.) OID - CORRECT ANSWER ✔✔TLD
Answers 2025
What is the recommended placement for a personnel dosimeter on the body of the limiter operator? - CORRECT 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? A.) 0.05 REM B.) 0.5 REM C.) 5.0 REM D.) 50.0 REM - CORRECT ANSWER ✔✔5.0 REM What is the NCRP recommended monthly effective (or equivalent) dose limit to the fetus for a pregnant worker? A.) 0.05 REM B.) 0.5 REM C.) 5.0 REM D.) 50.0 REM - CORRECT ANSWER ✔✔0.05 REM Radiation monitoring of personnel is required when what percentage of the annual occupational effective dose limit is likely to be received?
Answers 2025
B.) Roentgen C.) Gray D.) Rem - CORRECT ANSWER ✔✔Rad According to the Bergonie Tribondeau law, which of the following types of cells are most radiosensitive? A.) Brain cells B.) Embryonic tissue cells C.) Cells of the gastric mucosa D.) Skin cells - CORRECT ANSWER ✔✔Embryonic tissue cells Which type of x-ray photon interaction with the body is primarily responsible for the radiation dose absorbed by the patient? A.) Compton B.) Photoelectric C.) Coherent D.) Characteristic - CORRECT ANSWER ✔✔Photoelectric What is the NCRP recommendation for the lead equivalency of aprons used for personnel protection? A.) 0.05 mm B.) 0.25mm
Answers 2025
C.) 0.5 mm D.) 1.0mm - CORRECT ANSWER ✔✔0.5mm What is erythema, as it relates to radiation exposure? A.) Loss of hair caused by a high radiation dose B.) Loss of hair caused by a long-term low radiation dose C.) Reddening of the skin caused by high radiation dose D.) Reddening of the skin caused by long-term low radiation dose - CORRECT ANSWER ✔✔Reddening of the skin caused by high radiation dose What is the guiding philosophy of radiation protection? A.) ALARMA- as long as radiographs are made accessible B.) ALARA- as low as reasonably achievable C.) ALAIS- as long as ionizations are small D.) ALAP- as low as possible - CORRECT ANSWER ✔✔ALARA- as low as reasonably achievable Which of the following statements reflects current scientific opinion regarding the effects of diagnostic levels of ionizing radiation? A.) It is carcinogenic after a certain number of examinations have been preformed
Answers 2025
- Occurs within the third trimester of pregnancy A.) 1 and 2 only B.) 1 and 3 only C.) 2 and 3 only D.) 1, 2, and 3 - CORRECT ANSWER ✔✔1 and 2 only At what kVp levels do Compton interactions occur? A.) They do not occur with with x-ray exposure B.) They occur below the diagnostic radiology kVp range C.) They occur above the diagnostic radiology kVp range D.) They occur throughout the diagnostic radiology kvp range. - CORRECT ANSWER ✔✔They occur throughout the diagnostic radiology kvp range. What is the principal source of scatter radiation in radiography? A.) the tube housing B.) The Patient C.) The IR D.) The Collimator - CORRECT ANSWER ✔✔The patient
Answers 2025
What are the four essential elements required for x-ray production? A.) A target, a vacuum, an electron source, and a high potential difference B.) A target, an electron source, an inert gas environment, and a high potential difference C.) An electron source, a magnetic field, a resistance-free path, and a target. D.) An electron source, an electric field, a circuit and a target - CORRECT ANSWER ✔✔A target, a vacuum, an electron source, and a high potential difference The greatest portion of the x-ray beam is made up of : A.) Characteristic radiation B.) Bremsstrahlung radiation C.) electrons D.) heat - CORRECT ANSWER ✔✔Bremsstrahlung radiation The penetrating power of the x-ray beam is controlled by varying the: A.) anode angle B.) anode speed C.) milliamperage (mA) D.) Kilovoltage (kVp) - CORRECT ANSWER ✔✔Kilovoltage (kVp)
Answers 2025
The target of the x-ray tube is made of: A.) tungsten B.) glass C.) Stainless steel D.) Fluorescent phospors - CORRECT ANSWER ✔✔tungsten What is the standard control limit for the field light to radiation field alignment test? A.) exact alignment B.) +/- 1% of SID C.) +/- 2% of SID D.) +/- 5% of SID - CORRECT ANSWER ✔✔+/- 2% of SID What is the standard control limit for the beam (Central ray) alignment test? A.) exact alignment B.) within 1 degree of perpendicular C.) within 2 degrees of perpendicular D.) within 5 degrees of perpendicular - CORRECT ANSWER ✔✔within 1 degree of perpendicular
Answers 2025
How often should lead aprons and gloves be checked for cracks or holes? A.) every 3 months B.) every 6 months C.) every 9 months D.) every 12 months - CORRECT ANSWER ✔✔every 6 months How can detector fog be prevented when using computed radiography cassettes A.) Use the maximum SID B.) Apply close collimation C.) Protect the cassette before and after exposure D.) Select the optimum kVp - CORRECT ANSWER ✔✔Protect the cassette before and after exposure Which of the following will result in increase receptor exposure?
- Increase mA
- Increase exposure time
- Increase kVp A.) 1 and 2 only B.) 1 and 3 only
Answers 2025
D.) Receptor exposure, contrast, distortion, and distance - CORRECT ANSWER ✔✔Receptor exposure, contrast, spatial resolution, and distortion Contrast is primarily controlled by altering the: A.) mA B.) Exposure time C.) kVp D.) mAs - CORRECT ANSWER ✔✔kVp Scatter radiation fog affects radiographic quality by causing: A.) under exposure B.) Decreased Contrast C.) Increased contrast D.) Decreased density - CORRECT ANSWER ✔✔Decreased contrast A change from the small focal spot to the large focal spot will result in: A.) Decreased spatial resolution B.) Magnification C.) Distortion
Answers 2025
D.) Increased contrast - CORRECT ANSWER ✔✔Decreased spatial resolution An increase in object-image receptor distance (OID) will result in: A.) Increased magnification B.) Increased image sharpness C.) loss of contrast D.) Increased radiographic density - CORRECT ANSWER ✔✔Increased magnification motion of the patient, the tube, or the IR during the exposure will result in decreased: A.) Contrast B.) Distortion C.) Receptor exposure D.) Spatial Resolution - CORRECT ANSWER ✔✔Spatial Resolution What does quantum mottle (noise) look like on a radiographic image? A.) Large light and dark spots B.) Finely speckled or grainy areas C.) Alternating light and dark lines
