Texas Radiologic Technologist Licensing Exam Test Questions
And Correct Answers (Verified Answers) Plus Rationales
2025/2026 Q&A | Instant Download Pdf
1. What is the primary purpose of using a grid in radiography?
A. Increase patient dose
B. Improve image contrast
C. Reduce radiographic contrast
D. Increase scatter radiation
Grids absorb scattered radiation before it reaches the image receptor,
improving image contrast.
2. Which of the following is the most radiosensitive tissue in the human body?
A. Muscle
B. Nerve
C. Bone
D. Lymphoid tissue
Lymphoid tissue has rapidly dividing cells, making it highly sensitive to
radiation.
3. What is the SI unit of absorbed radiation dose?
A. Curie
B. Roentgen
C. Gray
D. Sievert
, Gray (Gy) measures the amount of radiation absorbed per kilogram of
tissue.
4. In digital radiography, what does DR stand for?
A. Dose Reduction
B. Direct Radiography
C. Digital Receptor
D. Diagnostic Radiography
Direct Radiography refers to a system where x-rays are directly converted
into a digital image.
5. What is the half-value layer (HVL) used to measure?
A. Beam quality
B. Patient dose
C. Exposure time
D. Scatter radiation
HVL indicates the thickness of material required to reduce the x-ray beam
intensity by half, reflecting beam quality.
6. What type of radiation is produced when electrons strike the anode in an x-
ray tube?
A. Alpha
B. Beta
C. X-ray
D. Gamma
X-rays are produced when high-speed electrons collide with the anode
target.
,7. Which of the following is a non-stochastic effect of radiation?
A. Cancer
B. Genetic mutations
C. Skin erythema
D. Hereditary effects
Non-stochastic effects have a threshold and severity increases with dose,
such as skin erythema.
8. What is the main function of the collimator?
A. Increase patient dose
B. Increase scatter radiation
C. Restrict the x-ray beam to the area of interest
D. Focus the anode
Collimators limit the x-ray beam to the area being imaged, reducing
patient dose and scatter.
9. Which interaction is responsible for most of the patient dose during
diagnostic radiography?
A. Compton scattering
B. Photoelectric absorption
C. Pair production
D. Coherent scattering
Photoelectric absorption deposits energy in tissues and is the main
contributor to patient dose.
10.What is the maximum allowable leakage radiation from an x-ray tube at 1
meter?
, A. 50 mR/hr
B. 50 R/hr
C. 100 mR/hr
D. 10 R/hr
Regulatory standards limit leakage radiation from x-ray tubes to 100
milliroentgens per hour at 1 meter.
11.Which of the following controls radiographic contrast?
A. mA
B. kVp
C. Exposure time
D. SID
kVp determines the energy of the x-ray beam, which affects contrast by
controlling tissue penetration.
12.Which of the following is an example of stochastic radiation effect?
A. Skin erythema
B. Hair loss
C. Cataracts
D. Cancer
Stochastic effects have no threshold; the probability increases with dose,
e.g., cancer.
13.In fluoroscopy, which device converts x-ray photons to visible light?
A. Grid
B. Image intensifier
C. Collimator
And Correct Answers (Verified Answers) Plus Rationales
2025/2026 Q&A | Instant Download Pdf
1. What is the primary purpose of using a grid in radiography?
A. Increase patient dose
B. Improve image contrast
C. Reduce radiographic contrast
D. Increase scatter radiation
Grids absorb scattered radiation before it reaches the image receptor,
improving image contrast.
2. Which of the following is the most radiosensitive tissue in the human body?
A. Muscle
B. Nerve
C. Bone
D. Lymphoid tissue
Lymphoid tissue has rapidly dividing cells, making it highly sensitive to
radiation.
3. What is the SI unit of absorbed radiation dose?
A. Curie
B. Roentgen
C. Gray
D. Sievert
, Gray (Gy) measures the amount of radiation absorbed per kilogram of
tissue.
4. In digital radiography, what does DR stand for?
A. Dose Reduction
B. Direct Radiography
C. Digital Receptor
D. Diagnostic Radiography
Direct Radiography refers to a system where x-rays are directly converted
into a digital image.
5. What is the half-value layer (HVL) used to measure?
A. Beam quality
B. Patient dose
C. Exposure time
D. Scatter radiation
HVL indicates the thickness of material required to reduce the x-ray beam
intensity by half, reflecting beam quality.
6. What type of radiation is produced when electrons strike the anode in an x-
ray tube?
A. Alpha
B. Beta
C. X-ray
D. Gamma
X-rays are produced when high-speed electrons collide with the anode
target.
,7. Which of the following is a non-stochastic effect of radiation?
A. Cancer
B. Genetic mutations
C. Skin erythema
D. Hereditary effects
Non-stochastic effects have a threshold and severity increases with dose,
such as skin erythema.
8. What is the main function of the collimator?
A. Increase patient dose
B. Increase scatter radiation
C. Restrict the x-ray beam to the area of interest
D. Focus the anode
Collimators limit the x-ray beam to the area being imaged, reducing
patient dose and scatter.
9. Which interaction is responsible for most of the patient dose during
diagnostic radiography?
A. Compton scattering
B. Photoelectric absorption
C. Pair production
D. Coherent scattering
Photoelectric absorption deposits energy in tissues and is the main
contributor to patient dose.
10.What is the maximum allowable leakage radiation from an x-ray tube at 1
meter?
, A. 50 mR/hr
B. 50 R/hr
C. 100 mR/hr
D. 10 R/hr
Regulatory standards limit leakage radiation from x-ray tubes to 100
milliroentgens per hour at 1 meter.
11.Which of the following controls radiographic contrast?
A. mA
B. kVp
C. Exposure time
D. SID
kVp determines the energy of the x-ray beam, which affects contrast by
controlling tissue penetration.
12.Which of the following is an example of stochastic radiation effect?
A. Skin erythema
B. Hair loss
C. Cataracts
D. Cancer
Stochastic effects have no threshold; the probability increases with dose,
e.g., cancer.
13.In fluoroscopy, which device converts x-ray photons to visible light?
A. Grid
B. Image intensifier
C. Collimator
