chapter 21-22 Vocab

2. A technique error in which film was exposed twice.
7. invisible, odorless electromagnetic radiation.
8. Long wavelengths with low energy, low frequency and low penetrating power; and called genz rays.
9. Partial image created when the central beam misses the x-ray film.
12. formed when the primary x-rays strikes the patient or comes in contact with only matter or substance.
13. Images on x-ray film that are out of focus.
14. The open-ended tube in a dental x-ray unit, commonly called the cone.
16. A technique error that elongates the image of the teeth.
17. A film that was not exposed to radiation.
19. radiation that is deflected from its path as it strikes matter.

1. Processing error that shows on the dental film when the film emulsion os exposed to temperature variations; normally shows as pitting or wrinkling of the emulsion.
3. x-ray technique error resulting from improper horizontal angulation.
4. An x-ray film that appears dark and dense related to old or overused chemicals.
5. A cross pattern that appears on film that has been placed backward in the mouth; caused by the pattern on the lead foil.
6. A technique error whereby the image of the teeth is shortened.
10. The science or study of radiation as it is used in medicines.
11. unit of electrical potential equal to 1,000 volts; is responsible for the quality of radiographs or penetrating power.
15. the primary ray emitting from the x-ray tube head.
17. difference between shades or colors.
18. degree of darkness on an x-ray.