30 Question RT quiz

1. An X-ray tube with a small focal spot is considered better than one with a large focal spot when it is desired to obtain:

2. One method of reducing radiographic contrast is to:

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

4. Of the following, the source providing the most penetrating radiation is:

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

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

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

8. What is the primary difference between X-rays and gamma rays of the same energy?

9. The specific activity of radioactive isotopes is measured in:

10. All other factorsbeing equal, which two types of film would give the sharpest images?

11. Besides serving as a filter, screens of high atomic number, such as lead and lead antimony, also:

12. 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:

13. The activity of the fixer diminishes after being used for a period of time because:

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

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

16. Constant agitation of the developer during the development process by means of mechanical stirrers or circulating pumps may:

17. The primary form of energy conversion when electrons strike a target in an X-ray tube results in the production of:

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

19. Thin sheets of lead foil in intimate contact with X-ray film during exposure increase film density because:

20. The specific activity of Cobalt-60 depends on:

21. The degree of concentration of the radioactive material in a gamma-ray source is referred to as:

22. An X-ray procedure requires an exposure of 5mA minutes at a source-to-film distance of 1000mm. If the source-to-film distance is decreased to 500mm, the exposure required to achieve the same density would be:

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

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

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

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

27. A qualitative term often used to indicate the size of the smallest detail which can be seen in a radiograph is:

28. A general rule governing the application of the geometric principles of shadow formation states that:

29. Iridium-192 may be used on steel up to:

30. While using an Isotope the operator may vary.

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