RADT 1200 - EXAM 4 QESTIONS AND ANSWERS

RADT 1200 - EXAM 4 QESTIONS AND ANSWERS Radiation-induced cataracts in humans follow a ______ dose-response relationship. a. threshold, nonlinear b. threshold, linear c. nonthreshold, linear d. nonthreshold, nonlinear - Answer- a. threshold, nonlinear Among the atomic bomb survivors, the number of leukemia victims has _______________ since the late 1940s and early 1950s. However, the occurrence rates of other radiation-induced malignancies have continued to ___________since the late 1950s and early 1960s. a. increased slowly; decrease b. rapidly declined; decrease c. slowly declined; escalate d. increased rapidly; decrease - Answer- c. slowly declined; escalate To assess the magnitude and severity of late effects on the exposed population from the 1986 nuclear power station accident at Chernobyl a. long-term follow-up studies are necessary. al follow-up is only necessary because the exposed population did not receive sufficient radiation exposure to cause severe late effects. c. short-term follow-up studies are necessary. d. follow-up is not necessary because the radiation received by the entire exposed population was fatal. - Answer- a. long-term follow-up studies are necessary. Which of the following late effects caused by exposure to ionizing radiation is considered to be most important? a. Cataract formation b. Embryologic or birth defects c. Cancer d. None; all are considered to be of equal importance. - Answer- c. cancer The human body can incorporate radium into bone because it is chemically similar to a. phosphorus. b. potassium. c. calcium. d. sodium. - Answer- c. calcium.