EXERCISES, LESSON 1
INSTRUCTIONS:
Answer the following exercises by marking the lettered response that best answers the question or best completes the incomplete statement or by writing the answer in the space provided.
After you have completed all the exercises, turn to "Solutions to Exercises" at the end of the lesson and check your answers.
1. ______________________________ discovered the x-ray in 1895.
2. What name is associated with the vacuum discharge tube?________________________________________________________________
3. Roentgen was unable to determine the exact nature of the rays produced so he referred to them as x-rays with x being commonly used to:
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4. An electromagnetic radiation of pure energy and extremely short wavelength (x-ray), sometimes referred to as x-ray photons, is known as:
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5. What are the two sources of radiation?
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6. List at least four examples of man-made radiation.
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7. The three sources of natural background radiation are:
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8. List the standard structural parts of the dental x-ray machine as identified.
a. Usually mounted behind a protective shield: _________________________
b. Houses the dental x-ray tube: ____________________________________
c. The tube head is suspended from this object: ________________________
9. Scattered/secondary radiation is dangerous to the ________________________.
10. _____________________________________ are those x-rays (photons) and
photo-electrons that have undergone a change in direction after interaction with
atoms and
molecules.
11. What is used to absorb the low energy, long wavelength x-rays (photons) and allow the high energy, short wavelength x-rays (photons) to pass through the
filter?
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12. How is it possible to expose only the area necessary for exposure when taking
x-rays?
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13. What is used to monitor or measure radiation received by the technician?
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14. The dosimeter results are recorded on:
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15. What is the maximum dose of radiation a worker may receive in any 3-month
period?
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16. Standards for dental x-ray booths or rooms require an equivalent shielding thickness of ______________________________________________________ .
17. An increase in the voltage and milliamperes reduces ___________________ for the patient.
18. How does a technician get a greater quantity of x-rays (photons) in the x-ray
beam?
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19. List the processes required for obtaining the desired film contrast (quality of x-ray
beam).
More shades of gray:
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Fewer shades of gray, more black and white shades:
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