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RADIOGRAPHY FOR VET TECH PENN
FOSTER EXAM WITH COM PLETE
SOLUTIONS
Question :How is the electromagnetic spectrum measured?
Correct answer:Energy (eV), frequency (Hz), and wavelength
(λ)
Question :Why is the x-ray tube enclosed in glass?
Correct answer:The x-ray tube is enclosed in glass so a
vacuum can be created.
Question :What's the purpose of a rotating anode?
Correct answer:To dissipate heat more quickly and prevent
damage to the anode
Question :Why are short wavelengths better than long
wavelengths for radiograph production?
Correct answer:They're very powerful and the potential for
penetration through a mass is better.
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Question :The x-ray tube consists of what two parts?
Correct answer:anode and cathode
Question :What does the control panel do?
Correct answer:allows the operator to control the x-ray
machine and adjust the settings
Question :Technique is a term used for the major factors set
on a radiology machine control panel. What factors are included in this term?
Correct answer:kV, mA, and time (seconds)
Question :Where is the grid located? What is its purpose?
Correct answer:The grid is located under the table and above
the cassette holding tray. Its purpose is to prevent scatter radiation
Question :List three functions of a cassette.
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Correct answer:A cassette is used to hold the intensifying
screens, keep the film clean, and keep light away from the film.
Question :Radiation levels are measured in
Correct answer:RAD, REM, and Sievert
Question :What is the minimal radiation safety protection
necessary when in the room during the x-ray exposure?
Correct answer:Gowns and gloves of 0.5 mm lead equivalent
Question :What is a dosimeter? What is it used for?
Correct answer:A dosimeter is a device worn at neck level
outside of the gown during radiographic procedures to monitor the amount of radiation the worker is exposed to in a given period of time
Question :There are two groups of people who should never
be allowed in the radiation area. Who are they?
Correct answer:pregnant women and people under 18 years
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Question :What's the difference between primary and scatter
radiation?
Correct answer:Primary radiation is the radiation that's found
in the x-ray beam leaving the machine. This is the useful beam that's used to make the image on the x-ray film. Scatter radiation is any radiation found outside the primary beam.
Question :Explain how you can reduce radiation exposure.
Correct answer:reduced by time, distance, and shielding.
Time means getting the image right the first time (proper settings and positioning). Distance means being as far away from the primary beam and patient as possible. Shielding means wearing personal protective equipment.