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- Question 1 of 40
1. Question
When other operating conditions are held constant, a change in tube current causes a change in radiation intensity emitted from an X-ray tube, the intensity being approximately proportional to tube current. What is the primary factor that prevents this from being exactly proportional?
CorrectIncorrect - Question 2 of 40
2. Question
Which of the following is not a factor in determining subject contrast?
CorrectIncorrect - Question 3 of 40
3. Question
The degree of concentration of the radioactive material in a gamma ray source referred to as the:
CorrectIncorrect - Question 4 of 40
4. Question
A curve that relates density with the logarithm of exposure or of relative exposure is called:
CorrectIncorrect - Question 5 of 40
5. Question
In million-volt radiography, filtration at the tube:
CorrectIncorrect - Question 6 of 40
6. Question
Co-59 becomes Co-60 when it is placed in a nuclear reactor where it captures:
CorrectIncorrect - Question 7 of 40
7. Question
For a given change in the radiation exposure, film contrast is the inherent ability to show:
CorrectIncorrect - Question 8 of 40
8. Question
The “photoelectric” effect involves:
CorrectIncorrect - Question 9 of 40
9. Question
The developer solution is:
CorrectIncorrect - Question 10 of 40
10. Question
A general rule governing the application of the geometric principles of shadow formation states that the:
CorrectIncorrect - Question 11 of 40
11. Question
When electrons of many different energies strike a target, a continuous spectrum of X-rays is generated. These X-rays are known as:
CorrectIncorrect - Question 12 of 40
12. Question
All other factors being the same, radiographic sharpness or definition is improved by using:
CorrectIncorrect - Question 13 of 40
13. Question
The minimum source-to-film distance needed to produce acceptable radiographs depends on the focal spot (source) size, the maximum allowable unsharpness, and the:
CorrectIncorrect - Question 14 of 40
14. Question
The major advantages of automatic film processing are:
CorrectIncorrect - Question 15 of 40
15. Question
Which of the following should be done to preserve radiographs during long-term storage?
CorrectIncorrect - Question 16 of 40
16. Question
The difference in density between different parts of a radiograph is called:
CorrectIncorrect - Question 17 of 40
17. Question
In radiography the term “RBE” stands for:
CorrectIncorrect - Question 18 of 40
18. Question
A given radiation dose will cause less damage if it is received over a very short period of time than if it is received over a long period of time.
CorrectIncorrect - Question 19 of 40
19. Question
The earliest indications of radiation damage may be detected in the:
CorrectIncorrect - Question 20 of 40
20. Question
The formula for the inverse square law is:
CorrectIncorrect - Question 21 of 40
21. Question
The intensity of the light emitted by the fluorescent screen depends upon the intensity of the:
CorrectIncorrect - Question 22 of 40
22. Question
The measure of the accuracy of the radiograph as a nondestructive testing tool is called the _____________ of the radiograph.
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23. Question
A gas-filled region located in an electrical field created by electrodes across which a potential difference is applied forms the major portion of:
CorrectIncorrect - Question 24 of 40
24. Question
Two serious obstacles to high-intensify fluoroscopy are:
CorrectIncorrect - Question 25 of 40
25. Question
. In general, the quality of fluoroscopic equipment is best determined:
CorrectIncorrect - Question 26 of 40
26. Question
. In fluoroscopic testing, a fundamental difficulty is the relative low brightness level of the images. One method for increasing brightness utilizes one of the following which converts light energy from the initial phosphor surface to electrons which are accelerated and focused onto a smaller fluorescent screen.
CorrectIncorrect - Question 27 of 40
27. Question
The absorption of radiation by a material varies:
CorrectIncorrect - Question 28 of 40
28. Question
In the microradiographic technique:
CorrectIncorrect - Question 29 of 40
29. Question
For practical purposes, the shape of the characteristic curve of an X-ray film is:
CorrectIncorrect - Question 30 of 40
30. Question
The term which describes the total absorption of the useful beam caused by the X-ray tube wall, the wall of the tube housing, and any material between the tube and housing is:
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31. Question
The fact that gases, when bombarded by radiation, ionize and become electrical conductors make them useful in:
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32. Question
The velocity of electrons striking the target in an X-ray tube is a function of the:
CorrectIncorrect - Question 33 of 40
33. Question
The uneven distribution of developed grains within the emulsion of a processed X-ray film causes the subjective impression of:
CorrectIncorrect - Question 34 of 40
34. Question
The specific activity of an isotopic source is usually measured in:
CorrectIncorrect - Question 35 of 40
35. Question
Which of the following isotopes has the longest half-life?
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36. Question
The primary form of energy conversion when electrons strike a target in an X-ray tube results in the production of:
CorrectIncorrect - Question 37 of 40
37. Question
Almost all gamma radiography is performed with:
CorrectIncorrect - Question 38 of 40
38. Question
The amount of unsharpness or blurring of a radiograph is:
CorrectIncorrect - Question 39 of 40
39. Question
Images of discontinuities close to the source side of the specimen become less clearly defined as:
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40. Question
The inherent filtration of an X-ray tube is a function of the:
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