TEST BANK FOR RADIATION PROTECTION IN MEDICAL RADIOGRAPHY 7TH EDITION BY SHERER.

Chapter 05: Radiation Monitoring Sherer: Radiation Protection in Medical Radiography, 8th Edition MULTIPLE CHOICE 1. Three different filters are incorporated into the detector packet of the optically stimulated luminescence dosimeter. Of what are these filters made? a. Aluminum, tin, and copper b. Aluminum, tin, and lead c. Zinc, copper, and barium d. Zinc, copper, and lead ANS: A 2. What is the maximum period of time that a thermoluminescent dosimeter (TLD) may be worn as a personnel device? a. 1 hour b. 1 week c. 1 month d. 3 months ANS: D 3. What do optically stimulated luminescence dosimeters, thermoluminescent dosimeters, pocket ionization chambers, and digital ionization dosimeters have in common? a. These devices are all used for area monitoring. b. These devices all use the same sensing material to detect ionizing radiation. c. These devices are all used for personnel monitoring. d. Each of these devices can only be used for personnel monitoring for a maximum of 6 months. ANS: C 4. Which of the following instruments is called a cutie pie? a. Geiger-Muller survey meter b. Ionization chamber-type survey meter c. Optically stimulated luminescence dosimeter d. Proportional counter ANS: B 5. Which of the following instruments generally has a check source of a weak, long-lived radioisotope located on one side of its external surface to verify its constancy daily? a. Pocket dosimeter b. Proportional counter c. Geiger-Muller survey meter d. Ionization chamber-type survey meter ANS: C 6. Which of the following devices contains an aluminum oxide detector? a. Digital ionization dosimeter b. Optically stimulated luminescence dosimeter c. Pocket ionization chamber d. Thermoluminescent dosimeter ANS: B 7. When the sensing crystals contained in the thermoluminescent dosimeter are irradiated, which of the following occurs? a. The protons in the crystalline lattice structure of the LiF molecule absorb energy and are excited to a higher energy level or bands. b. The neutrons in the crystalline lattice structure of the LiF molecule absorb energy and are excited to a higher energy level or bands. c. Some of the electrons in the crystalline lattice structure of the LiF molecule absorb energy and are excited to higher energy levels or bands. d. The electrons freed from the LiF molecule are trapped at a lower energy level or bands. ANS: C 8. Because of the OSL dosimeter’s sensitivity down to as low as 10 µSv for x-ray and gamma ray photons in the energy range 5 keV to 40 MeV, it is an excellent and practical monitoring device for a. employees working in high-radiation environments and for non-pregnant workers. b. employees working in low-radiation environments and for pregnant workers. c. members of the general public not occupationally employed. d. Pregnant employees working in high-radiation environments. ANS: B 9. The effective atomic number (Zeff) of lithium fluoride (LiF) is equal to a. 5.9. b. 6.4. c. 7.0. d. 8.2. ANS: D 10. Which of the following are advantages of the personnel digital ionization dosimeter? 1. Instant access to reports 2. No waiting time for mailing dosimeters 3. Lightweight and durable 4. Can be dropped or scratched with little chance of harm to the device a. 1, 2, and 3 only b. 1, 2, and 4 only c. 2, 3, and 4 only d. 1, 2, 3, and 4 ANS: D 11. Which of the following personnel dosimeters resembles an ordinary fountain pen externally? a. Personnel digital ionization dosimeter b. Optically stimulated luminescence dosimeter c. Pocket ionization chamber d. Thermoluminescent dosimeter ANS: C 12. Of the following, which are disadvantages of using pocket ionization chambers as personnel dosimeters? 1. They can discharge if they are subjected to mechanical shock. 2. Because these devices provide no permanent legal record of exposure, health care facilities that use this method to record personnel exposure must delegate someone to keep such a record. 3. If not read each day, the dosimeter may give an inaccurate reading because the electric charge tends to escape. a. 1 only b. 2 only c. 3 only d. 1, 2, and 3 ANS: D 13. Which component(s) of the Geiger-Muller survey meter alerts the operator to the presence of ionizing radiation? a. The shield covering the probe’s sensitivity chamber b. An audio amplifier and speaker c. The metal that encloses the counter’s gas-filled tube d. The meter scale ANS: B 14. Which of the following is not a requirement that radiation survey instruments must meet? a. They must all be equally sensitive in the detection of ionizing radiation. b. They should be able to detect all common types of ionizing radiation. c. They should be calibrated annually to ensure accurate operation. d. They should interact with ionizing radiation similarly to the way human tissue reacts. ANS: A 15. Medical physicists use ionization chambers connected to electrometers to perform the annual standard measurements required by state, federal, and health care accreditation organizations for radiographic and fluoroscopic devices. These annual measurements include 1. x-ray output in Gy or mGy. 2. fluoroscopic radiation entrance rates in mSv/min. 3. kVp setting accuracy. 4. exposure time exactness. 5. half-value layers, or beam quality a. 1, 2, and 3 only b. 1, 3, and 4 only c. 2, 3, and 5 only d. 1, 2, 3, 4, and 5