Page5 1. The study of effects of ionizing radiation on living systems is called: a) Radiology b) Radiobiology c) Radioimmunity d) Radiochemistry 2. Direct effect of interaction of radiation is most likely by: a) Coherent b) Particulate c) Characteristic d) Breaking 3. Which factor accounts for varying radiosensitivity of tissues? a) Rate of replication b) Cellular differentiation c) Repair & recovery rate d) Location of chromosomes 4. Which is the amount of radiation below which no adverse effects are seen? a) Dose b) Dose rate c) Clinical threshold dose d) Clinical radioresistance 5. Compton and coherent both cause ionization: a) Both are true b) Both are false c) Compton true, coherent false 6. A free radical: a) Uncharged molecule b) Has an unpaired electron in the outer shell c) Is highly reactive and unstable d) Combines with molecules to form toxins e) All of above 7. Which factor(s) contributes to radiation injury: a) Total dose b) Dose rate c) Cell sensitivity d) Age e) All of above 8. Radiation damage which are not seen in the person irradiated but that occur in the future generation is: a) Somatic damage b) Genetic damage c) Short-term damage d) Long-term damage 9. Which is most susceptible to ionizing radiation? a) Bone tissue b) Small lymphocytes c) Muscle tissue d) Nerve tissue 10. The traditional (Old) unit for measuring x-ray exposure in air: a) Gray b) Coulombs per kilogram c) Roentgen 1 2 3 4 5 6 7 8 9 10 11 12 13 b b a c c e e b b c b a d Page6 d) Rad 11. What is the greatest contributor to artificial radiation exposure? a) Radioactive materials b) Medical radiation c) Consumer products d) Weapons production 12. Radiosensitivity of an organ depends on weighting factor, adults are more susceptible to radiation damage than children: a) First statement is true, second false b) Second statement is true, first false c) Both are true d) Both are false 13. The rate of loss of energy from radiation as it moves through tissues: a) Total dose b) Dose rate c) AFM d) LET

Chapter 3 Radobiology Answer Key

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