Minnesota Radiation Therapist
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
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1. What is the primary purpose of a radiation therapist in cancer
treatment?
A. Diagnose cancer
B. Prescribe chemotherapy
C. Deliver prescribed radiation treatment
D. Perform surgical tumor removal
Rationale: Radiation therapists are responsible for accurately
delivering radiation doses as prescribed by the radiation oncologist.
2. The unit of absorbed radiation dose is:
A. Curie
B. Roentgen
C. Gray (Gy)
D. Sievert
, Rationale: The Gray measures absorbed energy per kilogram of
tissue.
3. Which imaging technique is most commonly used for treatment
planning in radiation therapy?
A. Ultrasound
B. X-ray fluoroscopy
C. CT scan
D. Mammography
Rationale: CT provides detailed anatomical cross-sectional images
essential for planning.
4. Which structure is most radiosensitive?
A. Muscle
B. Nerve tissue
C. Bone
D. Bone marrow
Rationale: Bone marrow contains rapidly dividing cells, making it
highly sensitive to radiation.
5. The main goal of fractionation in radiotherapy is to:
A. Increase tumor size
B. Allow normal tissue repair between doses
C. Eliminate imaging needs
D. Reduce patient cooperation
, Rationale: Fractionation improves tumor control while sparing
healthy tissue.
6. Which radiation is most commonly used in external beam therapy?
A. Alpha particles
B. Beta particles
C. X-rays (photons)
D. Neutrons only
Rationale: High-energy photons penetrate deeply to treat tumors.
7. The inverse square law relates radiation intensity to:
A. Time only
B. Mass only
C. Distance from source
D. Tissue density
Rationale: Radiation intensity decreases with the square of distance.
8. What is a linear accelerator used for?
A. MRI imaging
B. Generating high-energy radiation beams
C. Chemotherapy delivery
D. Tumor biopsy
Rationale: LINAC produces high-energy X-rays or electrons for
treatment.
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of a radiation therapist in cancer
treatment?
A. Diagnose cancer
B. Prescribe chemotherapy
C. Deliver prescribed radiation treatment
D. Perform surgical tumor removal
Rationale: Radiation therapists are responsible for accurately
delivering radiation doses as prescribed by the radiation oncologist.
2. The unit of absorbed radiation dose is:
A. Curie
B. Roentgen
C. Gray (Gy)
D. Sievert
, Rationale: The Gray measures absorbed energy per kilogram of
tissue.
3. Which imaging technique is most commonly used for treatment
planning in radiation therapy?
A. Ultrasound
B. X-ray fluoroscopy
C. CT scan
D. Mammography
Rationale: CT provides detailed anatomical cross-sectional images
essential for planning.
4. Which structure is most radiosensitive?
A. Muscle
B. Nerve tissue
C. Bone
D. Bone marrow
Rationale: Bone marrow contains rapidly dividing cells, making it
highly sensitive to radiation.
5. The main goal of fractionation in radiotherapy is to:
A. Increase tumor size
B. Allow normal tissue repair between doses
C. Eliminate imaging needs
D. Reduce patient cooperation
, Rationale: Fractionation improves tumor control while sparing
healthy tissue.
6. Which radiation is most commonly used in external beam therapy?
A. Alpha particles
B. Beta particles
C. X-rays (photons)
D. Neutrons only
Rationale: High-energy photons penetrate deeply to treat tumors.
7. The inverse square law relates radiation intensity to:
A. Time only
B. Mass only
C. Distance from source
D. Tissue density
Rationale: Radiation intensity decreases with the square of distance.
8. What is a linear accelerator used for?
A. MRI imaging
B. Generating high-energy radiation beams
C. Chemotherapy delivery
D. Tumor biopsy
Rationale: LINAC produces high-energy X-rays or electrons for
treatment.
