During the removal of an exposure device or source changer from secure storage, continuous surveillance shall be maintained by: A: the RSO B: a radiographer or radiographer's assistant C: a radiographer, radiographer's assistant, or a trainee D: a radiographer only {Ans: B}Why are Geiger-Mueller (G-M) survey meters preferred for field use? A: They are sensitive to low levels of gamma radiation B: They are impossible to saturate in high radiation areas C: They require no calibration D: They area the most inexpensive monitoring device {Ans: A}The term used to express the number of curies of radioactivity per unit of source weight is: A: decay B: emissivity C: specific activity D: source output {Ans: C}The biological effect resulting from exposure to gamma radiation would be greatest from: A: a single total effective dose equivalent of 150 to 200 R B: six total effective dose equivalent events, each of 30 to 50 R, over a period of 5 years C: low level, total effective dose equivalent events over a prolonged period of time D: a single 450 R shallow-dose equivalent exposure to the extremities {Ans: A}A device that is designed to shield a beam of radiation and reduce