RADIATION BIOLOGY 2026/2027 QUESTIONS AND
SOLUTIONS RATED A+
✔✔What symptom occurs during manifest illness of GI syndrome? - ✔✔Fever.
✔✔What is the dose range for both bone marrow and GI syndrome? - ✔✔6-10 Gy.
✔✔What are the prodromal stage symptoms of CNS syndrome? - ✔✔Extreme
nervousness, confusion, severe nausea and vomiting, loss of consciousness, and
burning sensations to skin.
✔✔What symptoms occur during manifest illness of CNS syndrome? - ✔✔Diarrhea,
convulsions, and coma.
✔✔What causes death in bone marrow syndrome? - ✔✔Anemia, hemorrhage, or
infection.
✔✔What causes death in GI syndrome? - ✔✔Dehydration, decreased absorption, and
infection.
✔✔What causes death in CNS syndrome? - ✔✔Increased pressure from blood vessel
damage and tissue inflammation.
✔✔What are the three general changes observed in an embryo or fetus after
irradiation? - ✔✔Lethality, congenital abnormalities, long-term late effects.
✔✔What effects can be produced from mutation of sperm or ovum? - ✔✔Genetic
effects.
✔✔What effects can be produced from direct exposure to the fetus? - ✔✔Congenital
effects.
✔✔What is the time frame for major organogenesis? - ✔✔From the 10th day post-
conception to the 6th week.
✔✔What characterizes the fetal stage? - ✔✔A period of growth.
✔✔What is the pre-implantation stage? - ✔✔Occurs from conception to 10 days post
conception.
✔✔What is the most radiosensitive stage? - ✔✔Pre-implantation and major
organogenesis.
✔✔What occurs during major organogenesis? - ✔✔Organ formation.
SOLUTIONS RATED A+
✔✔What symptom occurs during manifest illness of GI syndrome? - ✔✔Fever.
✔✔What is the dose range for both bone marrow and GI syndrome? - ✔✔6-10 Gy.
✔✔What are the prodromal stage symptoms of CNS syndrome? - ✔✔Extreme
nervousness, confusion, severe nausea and vomiting, loss of consciousness, and
burning sensations to skin.
✔✔What symptoms occur during manifest illness of CNS syndrome? - ✔✔Diarrhea,
convulsions, and coma.
✔✔What causes death in bone marrow syndrome? - ✔✔Anemia, hemorrhage, or
infection.
✔✔What causes death in GI syndrome? - ✔✔Dehydration, decreased absorption, and
infection.
✔✔What causes death in CNS syndrome? - ✔✔Increased pressure from blood vessel
damage and tissue inflammation.
✔✔What are the three general changes observed in an embryo or fetus after
irradiation? - ✔✔Lethality, congenital abnormalities, long-term late effects.
✔✔What effects can be produced from mutation of sperm or ovum? - ✔✔Genetic
effects.
✔✔What effects can be produced from direct exposure to the fetus? - ✔✔Congenital
effects.
✔✔What is the time frame for major organogenesis? - ✔✔From the 10th day post-
conception to the 6th week.
✔✔What characterizes the fetal stage? - ✔✔A period of growth.
✔✔What is the pre-implantation stage? - ✔✔Occurs from conception to 10 days post
conception.
✔✔What is the most radiosensitive stage? - ✔✔Pre-implantation and major
organogenesis.
✔✔What occurs during major organogenesis? - ✔✔Organ formation.
