Bmet Cdc Vol 8 Already Passed

9. (602) What does an ion chamber measure? a. Electron volts. b. Speed of X-rays. c. Distance of source. d. Radiation dose rate. {Ans: d. Radiation dose rate.}12. (602) Which is not an advantage of using optically stimulated luminescence (OSL) dosimeters over thermoluminescence dosimeters (TLD)? a. Less expensive. b. Can be reread multiple times. c. Can be read at room temperature. d. Signal loss less than one percent in a second reading. {Ans: a. Less expensive.}108. (629) The precessional frequency of protons is determined by the a. alignment of the hydrogen nuclei. b. strength of the magnetic field. c. resonant frequency. d. phase coherence. {Ans: b. strength of the magnetic field.}104. (628) What secondary magnet compensates for irregularities in the main magnetic field? a. Shim coil. b. Field coil. c. Gradient coil. d. Radio-frequency coil. {Ans: a. Shim coil.}119. (631) The far field of an ultrasound beam is called the a. focal zone. b. Freznel zone. c. diverging zone. d. Fraunhofer zone. {Ans: d. Fraunhofer zone.}63. (617) Normally, how often should equalization cycles on mobile X-ray unit batteries be performed? a. Weekly. b. Monthly. c. Semiannually. d. Annually. {Ans: d. Annually.}