50 Question RT quiz

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

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

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

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

6. 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:

7. What is one requirement that every radiographic film base must have?

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

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

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

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

12. Isotopes are sheilded in cameras made from?

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

14. Which of the following technique variables is most commonly used to adjust subject contrast?

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

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

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

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

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

20. The ability of a material to block or partially block the passage of X-rays and gamma rays is referred to as:

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

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

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

24. Subject contrast is affected by:

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

26. 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:

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

28. For a given change in the radiation exposure, film contrast is the inherent ability to show:

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

30. 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

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

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

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

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

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

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

37. The developer solution is:

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

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

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

41. One method of reducing radiographic contrast is to:

42. The load that can be handled by an X-ray tube focal spot is governed by:

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

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

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

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

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

48. X-ray films with large grain size:

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

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

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