RADT QUESTIONS ANSWERS 100
PERCENT CORRECT VERIFIED 2026
RADIOLOGY TEST PAPER
SOLUTIONS GRADED A+
◉ Mean survival time is _______ proportional to Dose
Answer: inversely
◉ What is the mean survival time for GI syndrome?
Answer: 4 days
◉ What is the mean survival time for CNS death?
Answer: 0-3 days
◉ Definition of somatic damage
Answer: Damage to a living organism which itself was exposed
◉ What is the mean survival time for hematologic symptoms?
Answer: 10-60 days
◉ What is the dose response of epithelial tissue/ skin?
Answer: non-linear, threshold
, ◉ A hit to a DNA molecule during G1 may cause what?
Answer: chromatid deletion (part of chromosome lost)
◉ What type of DNA hit is considered most signifigant in terms of
latent human damage?
Answer: multi-hit
◉ Definition of Late effects
Answer: occur at organ, tissue and cellular level from lower doses over a
longer period of time (fractionated)
◉ Radiation protection protocols are based on what type of dose
response relationship?
Answer: linear, non-threshold
◉ DNA irradiation may result in what 5 diseases?
Answer: 1. Hemophilia
2. Down's Syndrome
3. Sickle Cell Anemia
4. Cystic Fibrosis
5. Hydrocephalus
◉ Calculation of dose responses is important for: (3)
Answer: 1. Design therapeutic treatment doses
PERCENT CORRECT VERIFIED 2026
RADIOLOGY TEST PAPER
SOLUTIONS GRADED A+
◉ Mean survival time is _______ proportional to Dose
Answer: inversely
◉ What is the mean survival time for GI syndrome?
Answer: 4 days
◉ What is the mean survival time for CNS death?
Answer: 0-3 days
◉ Definition of somatic damage
Answer: Damage to a living organism which itself was exposed
◉ What is the mean survival time for hematologic symptoms?
Answer: 10-60 days
◉ What is the dose response of epithelial tissue/ skin?
Answer: non-linear, threshold
, ◉ A hit to a DNA molecule during G1 may cause what?
Answer: chromatid deletion (part of chromosome lost)
◉ What type of DNA hit is considered most signifigant in terms of
latent human damage?
Answer: multi-hit
◉ Definition of Late effects
Answer: occur at organ, tissue and cellular level from lower doses over a
longer period of time (fractionated)
◉ Radiation protection protocols are based on what type of dose
response relationship?
Answer: linear, non-threshold
◉ DNA irradiation may result in what 5 diseases?
Answer: 1. Hemophilia
2. Down's Syndrome
3. Sickle Cell Anemia
4. Cystic Fibrosis
5. Hydrocephalus
◉ Calculation of dose responses is important for: (3)
Answer: 1. Design therapeutic treatment doses
