Dental Radiography Ch 21-24

3. The zone in which structures are clearly demonstrated on a panoramic image is termed?
5. The collimator is a lead plate with a small, round or rectangular opening.
8. Recommendations by the international commission on radiological protection recommend the following occupational exposure dose limits.
9. Used for extraoral imaging, sensitive to light.
12. The area of the oral cavity that is most likely to elicit the gag reflex when stimulated is the anterior third of the tongue.
14. Used to hold the screen film in tight contact with the intensifying screen and to protect the film from exposure to light.
15. A____equals the amout of radiation that will ionize one cubeic centimeter of air.
16. ___radiation forms when the primary x-ray strikes or contacts any type of matter(solid, liquid, or gas.)
17. ___is the process by which atoms change into negatively or positively charged ions during radiation.
18. The ___ is an abbreviation for the radiation dose to which body tissues are exposed, which is measured in terms of its estimated biological effects.
19. Used to view large areas of the jaw or skull

1. A device used to stabilize the patient;s head in a plane parallel to the film and at right angles to the central ray of the X-ray beam:it is used for large radiographs of the head.
2. The orthopantomograph unit took the first acceptable___ radiography.
4. During the ___ process, current passes through the cathode filament and heats it to an exteremely high temperature.
5. Device used to convert x-ray energy into visible light,which in turn exposes screen film.
6. A cassett holder with two intensifying screens is used.
7. ___is the degree of darkness on an x-
10. ___ radiation deflects from its path as it strikes matter.
11. ___Took the first intraoral radiograph
13. What is not a characteristic of short, hard wavelengths.
20. What characteristic of a wavelength categorizes its electromagnetic energy?