Proyecto RT.1 (1-50)

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1. Which of the following types of intensifying screens are not used in industrial radiography?

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2. Betatrons are used to produce X rays in what range?

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3. Which of the following is an isotope not artificially produced for industrial use:

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4. One half value layer of lead for Iridium-192 is approximately:

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5. One half value layer of lead for Cobalt-60 is approximately:

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6. The film processing step in which the undeveloped silver bromide is removed from the film emulsion is called:

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7. A radiation producing device which emits radiation of one or a few discreet wavelengths is:

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8. The intensifying action of lead screens is caused by:

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9. Most of the energy applied to an X ray tube is converted into:

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10. Radiography of tubular sections using a double wall, double viewing technique is mainly applicable to sections:

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11. Which of the following is the most common method of packaging film?

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12. Which of the following types of radiation is particulate?

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13. Most scattered radiation which adversely affects the radiographic image quality originates:

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14. An effect of scattered radiation is to:

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15. What is the most important factor in determining the archival quality of radiographic film?

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16. Radiographic enlargement to distinguish small defects is possible:

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17. A detrimental effect of fluorescent screens might be:

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18. The penetrating power of an X ray machine is indicated by:

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19. Reticulation may be the result of:

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20. The main advantage of having small focal spot on an X ray tube is:

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21. Cobalt-60 is produced by:

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22. For a particular isotope, gamma radiation intensity is determined by:

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23. Which of the following statements should be true to achieve the highest level of radiographic sharpness (definition)?

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24. Which of the following correctly expresses the inverse square law if I1=dose rate nearest source, I2=dose rate furthest from the source, D1=distance nearest to source and D2=distance furthest from the source:

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25. Thicker materials would normally be inspected using:

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26. Another name for a penetrameter is:

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27. The silver nitrate spot test can be used to:

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28. The difference in densities seen on a radiograph due to section changes in an item is:

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29. Which type of film would exhibit the coarsest grain?

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30. An advantage of a gamma ray source is:

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31. Higher X ray tube voltages result in:

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32. A casting flaw which is formed when two masses of molten metal flowing from different directions flow together, but fail to fuse, is called:

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33. X rays are produced by:

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34. Which of the following is a function of lead screens?

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35. A silver nitrate spot test might be used to:

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36. A linear accelerator is used to produce X rays having energy in the range of:

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37. How is the wavelength of scattered radiation compared to the primary beam?

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38.Which of the following viewing conditions is most desirable for interpreting radiographic film?

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39. Pinhole radiography would be used to:

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40. A straight, dark line in the centre of the film of a weld cap would probably be:

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41. Which one of the following steps is necessary to dissolve the undarkened silver salt crystals in the film emulsion:

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42. Approximately what energy X ray machine would be required to have penetrating power equivalent to a Cobalt-60 source:

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43. The normal range of steel that is radiographed using Ir-192 is:

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44. The focal spot size of an X ray machine must be known in order to determine:

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45. X ray intensity is a function of :

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46. What is the minimum age in years at which a person may perform radiography :

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47. A densitometer is an instrument that measures:

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48. Which of the following is the correct formula to use for calculating geometric unsharpness if F=source size, T=specimen thickness, D=source to object distance and Ug=geometric unsharpness: