RADIATION BIOLOGY FINAL EXAM 2026/2027
QUESTIONS AND SOLUTIONS RATED A+
✔✔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.
✔✔What is a threshold dose response curve? - ✔✔A dose at which a response or
reaction first appears.
✔✔What are genetic effects? - ✔✔Those that affect future generations (offspring).
✔✔What are somatic effects? - ✔✔Those that affect the individual.
, ✔✔What are carcinogens? - ✔✔Any substance, agent, or organism that causes cancer
or increases the risk of developing it.
✔✔List three carcinogens. - ✔✔Viruses, chemicals, radiation.
✔✔What is the difference between threshold and non-threshold effects? - ✔✔Threshold
effects have a dose below which the effect does not occur; non-threshold effects occur
randomly.
✔✔What is the latent period in relation to cancer? - ✔✔The time between irradiation
and the appearance of cancer.
✔✔What factors is the latent period dependent on? - ✔✔Dose, age, type of cancer.
✔✔What is the linear dose response curve? - ✔✔May overestimate risk at low doses.
✔✔What is the linear quadratic dose response curve? - ✔✔Underestimates the risk,
used for low dose probability and severity.
✔✔What is mutational frequency? - ✔✔Number of spontaneous mutations which arise
in each generation.
✔✔What is the radiation doubling dose? - ✔✔Dose that doubles the number of
spontaneous mutations.
✔✔What is the parenchymal compartment composed of? - ✔✔Stem cells, intermediate
cells, and end cells.
✔✔What does B & T's law state? - ✔✔Pressure of a given mass of an ideal gas is
inversely proportional to its volume as long as the temperature remains constant.
✔✔What do A & V's modifications state? - ✔✔Volume is directly proportional to the
amount of gas when pressure and temperature are held constant.
✔✔What are VIM, DIM, RPM, FPM, and multipotential connective tissue? - ✔✔VIM:
rapidly dividing stem cells; DIM: actively mitotic but more differentiated; RPM: do not
divide regularly but can; FPM: highly differentiated, do not divide; MPC: divides
irregularly.
✔✔What are stochastic effects? - ✔✔Probabilistic somatic effects with no threshold.
✔✔What are non-stochastic effects? - ✔✔Deterministic somatic effects directly related
to the dose received.
QUESTIONS AND SOLUTIONS RATED A+
✔✔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.
✔✔What is a threshold dose response curve? - ✔✔A dose at which a response or
reaction first appears.
✔✔What are genetic effects? - ✔✔Those that affect future generations (offspring).
✔✔What are somatic effects? - ✔✔Those that affect the individual.
, ✔✔What are carcinogens? - ✔✔Any substance, agent, or organism that causes cancer
or increases the risk of developing it.
✔✔List three carcinogens. - ✔✔Viruses, chemicals, radiation.
✔✔What is the difference between threshold and non-threshold effects? - ✔✔Threshold
effects have a dose below which the effect does not occur; non-threshold effects occur
randomly.
✔✔What is the latent period in relation to cancer? - ✔✔The time between irradiation
and the appearance of cancer.
✔✔What factors is the latent period dependent on? - ✔✔Dose, age, type of cancer.
✔✔What is the linear dose response curve? - ✔✔May overestimate risk at low doses.
✔✔What is the linear quadratic dose response curve? - ✔✔Underestimates the risk,
used for low dose probability and severity.
✔✔What is mutational frequency? - ✔✔Number of spontaneous mutations which arise
in each generation.
✔✔What is the radiation doubling dose? - ✔✔Dose that doubles the number of
spontaneous mutations.
✔✔What is the parenchymal compartment composed of? - ✔✔Stem cells, intermediate
cells, and end cells.
✔✔What does B & T's law state? - ✔✔Pressure of a given mass of an ideal gas is
inversely proportional to its volume as long as the temperature remains constant.
✔✔What do A & V's modifications state? - ✔✔Volume is directly proportional to the
amount of gas when pressure and temperature are held constant.
✔✔What are VIM, DIM, RPM, FPM, and multipotential connective tissue? - ✔✔VIM:
rapidly dividing stem cells; DIM: actively mitotic but more differentiated; RPM: do not
divide regularly but can; FPM: highly differentiated, do not divide; MPC: divides
irregularly.
✔✔What are stochastic effects? - ✔✔Probabilistic somatic effects with no threshold.
✔✔What are non-stochastic effects? - ✔✔Deterministic somatic effects directly related
to the dose received.
