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Questions and Answers
What is the Oxygen Enhancement Ratio (OER) of X-rays?
What is the Oxygen Enhancement Ratio (OER) of X-rays?
- 4.0
- 1.6
- 3.0
- 2.5 (correct)
When must oxygen be present for the oxygen effect to be observed?
When must oxygen be present for the oxygen effect to be observed?
- During or within microseconds after radiation exposure (correct)
- Only after radiation exposure is complete
- At any time after radiation exposure
- Only during radiation exposure
How long after irradiation can oxygen still act to sensitize cells?
How long after irradiation can oxygen still act to sensitize cells?
- Up to 1 second after irradiation
- Up to 5 milliseconds after irradiation (correct)
- Only during radiation exposure
- Up to 1 millisecond after irradiation
At what level do free radicals act to cause radiation damage?
At what level do free radicals act to cause radiation damage?
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Which phase of the cell cycle has a lower OER?
Which phase of the cell cycle has a lower OER?
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What is the approximate OER for neutrons?
What is the approximate OER for neutrons?
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Why does the OER decrease at low doses for rapidly growing cells?
Why does the OER decrease at low doses for rapidly growing cells?
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What is the range of oxygen tension between different tissues?
What is the range of oxygen tension between different tissues?
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What type of hypoxia results from the limited diffusion distance of oxygen through tissue?
What type of hypoxia results from the limited diffusion distance of oxygen through tissue?
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What is the minimum amount of oxygen required to produce the dramatic oxygen effect with X-rays?
What is the minimum amount of oxygen required to produce the dramatic oxygen effect with X-rays?
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