Oxygen Enhancement Ratio (OER) and Ionizing Radiations
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Questions and Answers

How does the OER vary with cell cycle?

  • G1 phase cells have lower OER, dominating low-dose region (correct)
  • OER remains constant throughout the cell cycle
  • G1 phase cells have higher OER, dominating low-dose region
  • S phase cells have lower OER, dominating low-dose region

What is the Oxygen Enhancement Ratio (OER) at high doses for sparsely ionizing radiations?

  • Less than 2.5
  • More than 3.5
  • Between 2.5 and 3.5 (correct)
  • Exactly 2.5

What is the Oxygen Enhancement Ratio (OER) for densely ionizing radiations (α-particles)?

  • About 1.6; smaller oxygen effect than x-rays
  • Unity; no oxygen effect (correct)
  • Between 2.5 and 3.5
  • More than 3.5

Which phase of the cell cycle has a lower Oxygen Enhancement Ratio (OER)?

<p>G1 phase (A)</p> Signup and view all the answers

What effect does oxygen have on intermediate ionizing density radiations (Neutrons)?

<p>Reduced shoulder in survival curves; OER for neutrons is about 1.6 (D)</p> Signup and view all the answers

What is the Oxygen Enhancement Ratio (OER) at high doses for sparsely ionizing radiations?

<p>Between 2.5 and 3.5 (B)</p> Signup and view all the answers

What is the effect of oxygen on densely ionizing radiations (α-particles)?

<p>OER is unity; no oxygen effect (B)</p> Signup and view all the answers

Which phase of the cell cycle has a lower Oxygen Enhancement Ratio (OER)?

<p>G1 phase cells (A)</p> Signup and view all the answers

What is the Oxygen Enhancement Ratio (OER) for intermediate ionizing density radiations (Neutrons)?

<p>About 1.6 (D)</p> Signup and view all the answers

How does the OER vary with cell cycle?

<p>G1 phase cells have lower OER, dominating low-dose region (B)</p> Signup and view all the answers

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