50 Question RT quiz

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

2. The reason the exposure time must be increased by a factor of four when the source-to-film distance is doubled is:

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

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

5. The quantitative measure of film blackening is referred to as:

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

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

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

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

10. Which of the following isotopes is commonly used for radiographic purposes:

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

12. In certain cases it may be advantageous to pack lead shot around a specimen. The purpose for doing this is:

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

14. The interval between the time a film is placed in a fixer solution and the time when the original diffuse, yellow miliciness disappears is known as:

15. 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:

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

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

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

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

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

21. Which is a disadvantage of using an isotope?

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

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

24. Subject contrast is affected by:

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

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

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

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

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

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

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

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

33. While using an Isotope the operator may vary.

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

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

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

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

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

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

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

41. A monochromatic X-ray beam:

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

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

44. 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:

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

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

47. Almost all gamma radiography is performed with:

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

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

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

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