30 Question RT quiz

1. While using an X-ray tube for radiography, the operator wishes to increase the radiation intensity. To do so, the:

2. When sharp, black, bird-foot shaped marks which are known not to correspond with any discontinuities appear at random on radiographs, they are probably caused by:

3. In million-volt radiography, filtration at the tube:

4. Subject contrast is affected by:

5. Two isotopic sources of a given strength have two different specific activity values. The source with the higher specific activity value will:

6. The slope of the characteristic curve of a radiographic film is called:

7. Improper geometric factors, poor contact between film and lead foil screens, and graininess of film are possible causes of:

8. With respect to quality, what three factors must be considered in selecting a source-to-film distance?

9. Low voltage X-ray tubes are generally fitted with windows made of:

10. Filters placed between the X-ray tube and specimen tend to reduce scatter radiation undercutting the specimen:

11. Which of the following X-ray generators would produce the narrowest cone of X-radiation?

12. The absorption of gamma-rays from a given source when passing through a metal is due to:

13. The speed at which X and gamma rays travel is

14. Film selection for an X-ray exposure depends on:

15. A device which is basically a combination of magnet and transformer designed to guide and accelerate electrons in a circular orbit to very high energies is called a:

16. A special form of scatter due to X-ray diffraction effects in a specimen with large grains will result in:

17. The range of thickness over which densities are obtained that are satisfactory for interpretation is a measure of the:

18. Lead screens are used for almost all exposures when using:

19. The "density" of a radiographic image refers to:

20. The velocity of electrons striking the target in an X-ray tube is a function of:

21. The main factor that determines the penetrating ability of an X-ray beam is?

22. The developer solution is:

23. The emulsion or image layer of the unexposed film contains grains of

24. In an X-ray tube, the filament and focusing cup are the two essential parts of the:

25. Because of geometrical factors such as source size, source-to-specimen distance and specimen- to-film distance, there can be a lack of perfect sharpness at the edges of indications which is referred to as the:

26. As an effective energy of the radiation increases up to about 250 kV:

27. A monochromatic X-ray beam:

28. A light image of a backing "B" on a processed radiograph is probably caused by:

29. Why are isotopes preferred to X-rays?

30. The mottling caused by diffraction when radiographing fairly large-grained metallic specimens can be reduced and in some cases eliminated by:


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