MASSACHUSETTS RADIATION THERAPIST LICENSURE
EXAM QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS) Q&A 2026 |INSTANT DOWNLOAD PDF
1. Which of the following is the primary mechanism of action
for ionizing radiation in cancer treatment?
A. Disrupting the cell membrane
B. Damaging DNA directly
C. Increasing blood flow to tissues
D. Altering protein folding
Rationale: Radiation primarily kills cells by causing DNA
damage, which prevents replication and leads to cell death.
Correct Answer: B. Damaging DNA directly
2. Which unit is used to measure absorbed radiation dose?
A. Gray (Gy)
B. Sievert (Sv)
C. Roentgen (R)
D. Becquerel (Bq)
Rationale: The gray (Gy) measures the energy deposited per
kilogram of tissue, which is the absorbed dose.
Correct Answer: A. Gray (Gy)
,3. What is the primary goal of fractionation in radiation
therapy?
A. Increase patient comfort
B. Reduce tumor size in one session
C. Minimize damage to healthy tissue while maximizing tumor
control
D. Enhance imaging contrast
Rationale: Fractionation allows normal tissues to repair while
tumor cells accumulate damage.
Correct Answer: C. Minimize damage to healthy tissue while
maximizing tumor control
4. Which imaging modality is most commonly used for
treatment planning in radiation therapy?
A. Ultrasound
B. MRI
C. CT scan
D. PET scan
Rationale: CT scans provide detailed anatomical information
needed for precise radiation planning.
Correct Answer: C. CT scan
5. What is the primary safety concern when handling
radioactive sources in a therapy department?
,A. Electrical shock
B. Radiation exposure
C. Fire hazard
D. Tripping hazards
Rationale: Radiation safety protocols focus on minimizing
exposure to radioactive sources.
Correct Answer: B. Radiation exposure
6. Which type of radiation is commonly used for external
beam therapy?
A. Alpha particles
B. Beta particles
C. Gamma rays and X-rays
D. Neutrons
Rationale: External beam therapy typically uses high-energy X-
rays or gamma rays to penetrate tissue.
Correct Answer: C. Gamma rays and X-rays
7. Which of the following is a late effect of radiation therapy?
A. Nausea and vomiting
B. Skin erythema
C. Fibrosis and tissue scarring
D. Alopecia
, Rationale: Late effects, such as fibrosis, occur months to years
after treatment, whereas early effects like erythema appear
shortly after exposure.
Correct Answer: C. Fibrosis and tissue scarring
8. In radiation therapy, what does “GTV” stand for?
A. Gross Tumor Volume
B. General Treatment Volume
C. Gradual Therapy Verification
D. Gamma Therapy Vector
Rationale: GTV defines the actual visible or palpable tumor
volume on imaging.
Correct Answer: A. Gross Tumor Volume
9. Which principle is critical in ALARA for radiation safety?
A. Keep exposures as low as reasonably achievable
B. Limit therapy to high-dose treatments only
C. Focus on patient comfort rather than dose
D. Increase beam intensity to shorten sessions
Rationale: ALARA emphasizes minimizing radiation dose to
patients and staff while achieving treatment goals.
Correct Answer: A. Keep exposures as low as reasonably
achievable
EXAM QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS) Q&A 2026 |INSTANT DOWNLOAD PDF
1. Which of the following is the primary mechanism of action
for ionizing radiation in cancer treatment?
A. Disrupting the cell membrane
B. Damaging DNA directly
C. Increasing blood flow to tissues
D. Altering protein folding
Rationale: Radiation primarily kills cells by causing DNA
damage, which prevents replication and leads to cell death.
Correct Answer: B. Damaging DNA directly
2. Which unit is used to measure absorbed radiation dose?
A. Gray (Gy)
B. Sievert (Sv)
C. Roentgen (R)
D. Becquerel (Bq)
Rationale: The gray (Gy) measures the energy deposited per
kilogram of tissue, which is the absorbed dose.
Correct Answer: A. Gray (Gy)
,3. What is the primary goal of fractionation in radiation
therapy?
A. Increase patient comfort
B. Reduce tumor size in one session
C. Minimize damage to healthy tissue while maximizing tumor
control
D. Enhance imaging contrast
Rationale: Fractionation allows normal tissues to repair while
tumor cells accumulate damage.
Correct Answer: C. Minimize damage to healthy tissue while
maximizing tumor control
4. Which imaging modality is most commonly used for
treatment planning in radiation therapy?
A. Ultrasound
B. MRI
C. CT scan
D. PET scan
Rationale: CT scans provide detailed anatomical information
needed for precise radiation planning.
Correct Answer: C. CT scan
5. What is the primary safety concern when handling
radioactive sources in a therapy department?
,A. Electrical shock
B. Radiation exposure
C. Fire hazard
D. Tripping hazards
Rationale: Radiation safety protocols focus on minimizing
exposure to radioactive sources.
Correct Answer: B. Radiation exposure
6. Which type of radiation is commonly used for external
beam therapy?
A. Alpha particles
B. Beta particles
C. Gamma rays and X-rays
D. Neutrons
Rationale: External beam therapy typically uses high-energy X-
rays or gamma rays to penetrate tissue.
Correct Answer: C. Gamma rays and X-rays
7. Which of the following is a late effect of radiation therapy?
A. Nausea and vomiting
B. Skin erythema
C. Fibrosis and tissue scarring
D. Alopecia
, Rationale: Late effects, such as fibrosis, occur months to years
after treatment, whereas early effects like erythema appear
shortly after exposure.
Correct Answer: C. Fibrosis and tissue scarring
8. In radiation therapy, what does “GTV” stand for?
A. Gross Tumor Volume
B. General Treatment Volume
C. Gradual Therapy Verification
D. Gamma Therapy Vector
Rationale: GTV defines the actual visible or palpable tumor
volume on imaging.
Correct Answer: A. Gross Tumor Volume
9. Which principle is critical in ALARA for radiation safety?
A. Keep exposures as low as reasonably achievable
B. Limit therapy to high-dose treatments only
C. Focus on patient comfort rather than dose
D. Increase beam intensity to shorten sessions
Rationale: ALARA emphasizes minimizing radiation dose to
patients and staff while achieving treatment goals.
Correct Answer: A. Keep exposures as low as reasonably
achievable
