50 Question RT quiz

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

2. A curve relating density with the logarithm of exposure or of relative exposure is called:

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

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

5. The range of specimen thicknesses that can be adequately recorded on the radiograph is referred to as the:

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

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

8. Which of the following isotopes has the longest half-life?

9. The kilovoltage applied to an X-ray tube affects:

10. Images of discontinuities close to the source side of the specimen become less clearly defined as:

11. The amount of unsharpness or blurring of a radiograph is:

12. Which of the following types of radiation is commonly used in radiographic testing?

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

14. Which of the following instruments would exhibit the best sensitivity and most likely be used to detect small leaks in a radiation barrier?

15. The greys and blacks in a radiographic image are composed of:

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

17. The shorter the wavelength of X or gamma rays:

18. 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:

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

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

21. The most common way of cooling the anode of a high-power X-ray tube is:

22. Almost all gamma radiography is performed with:

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

24. The uneven distribution of developed grains within the emulsion of a processed X-ray film causes the subjective impression of:

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

26. Two factors which greatly affect the suitability of the target material in an X-ray tube are:

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

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

29. Which is a disadvantage of using an isotope?

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

31. A monochromatic X-ray beam:

32. 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:

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

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

35. Films that are left between lead screens too long in a high-temperature and high-humidity atmosphere may:

36. In X-ray radiography, alternating current must be changed to pulsating direct current in order to satisfy the need for unidirectional current. This change may be accomplished by

37. The most effective method for handprocessing large numbers of radiographs is:

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

39. The quantity of radiation striking a unit area of film:

40. A lead sheet containing a pinhole may be placed halfway between the X-ray tube and the film to:

41. The specific activity of an isotopic source is usually measured in:

42. The primary function of a darkroom is the protection of sensitive film by control of:

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

44. The main purpose of the X-ray generator controls on the equipment is:

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

46. The sharpness of a radiographic image is determined by?

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

48. Why are isotopes preferred to X-rays?

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

50. Cobalt-59 becomes Cobalt-60 when it is placed in a nuclear reactor where it captures:

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