Podcast
Questions and Answers
What is the approximate Oxygen Enhancement Ratio (OER) for neutrons?
What is the approximate Oxygen Enhancement Ratio (OER) for neutrons?
- 2.0
- 1.6 (correct)
- 2.5
- 1.2
What is the primary factor that determines the extent of radiation-induced DNA damage?
What is the primary factor that determines the extent of radiation-induced DNA damage?
- Phase of cell cycle
- Linear energy transfer (LET)
- Type of radiation (X-rays or neutrons)
- Presence or absence of oxygen (correct)
What is the minimum time required for oxygen to be present after irradiation to produce the oxygen effect?
What is the minimum time required for oxygen to be present after irradiation to produce the oxygen effect?
- 1 second
- 1 microsecond
- 5 milliseconds (correct)
- 1 minute
What is the primary mechanism by which oxygen acts to produce the oxygen effect?
What is the primary mechanism by which oxygen acts to produce the oxygen effect?
What is the characteristic of chronic hypoxia in tumors?
What is the characteristic of chronic hypoxia in tumors?
What is the reason for the smaller OER at low doses compared to high doses in rapidly growing cells?
What is the reason for the smaller OER at low doses compared to high doses in rapidly growing cells?
What is the primary mechanism by which oxygen enhances the effect of radiation?
What is the primary mechanism by which oxygen enhances the effect of radiation?
What is the effect of hypoxia on chemoresistance?
What is the effect of hypoxia on chemoresistance?
What is the Oxygen Enhancement Ratio (OER) equal to?
What is the Oxygen Enhancement Ratio (OER) equal to?
Which of the following types of radiation has an OER of unity?
Which of the following types of radiation has an OER of unity?
What is the effect of linear energy transfer on OER?
What is the effect of linear energy transfer on OER?
Which of the following cells have a higher OER?
Which of the following cells have a higher OER?
What is the primary reason for the development of acute hypoxia in tumors?
What is the primary reason for the development of acute hypoxia in tumors?
What is the phenomenon by which hypoxic cells become oxygenated after a dose of radiation?
What is the phenomenon by which hypoxic cells become oxygenated after a dose of radiation?
What is the primary mechanism by which hypoxia cell sensitizers increase radiosensitivity of hypoxic cells?
What is the primary mechanism by which hypoxia cell sensitizers increase radiosensitivity of hypoxic cells?
What is the primary benefit of fractionation in reducing hypoxia in tumors?
What is the primary benefit of fractionation in reducing hypoxia in tumors?
What is the approximate proportion of hypoxic cells in an untreated tumor, as observed by Van Putten and Kallman in mouse sarcoma?
What is the approximate proportion of hypoxic cells in an untreated tumor, as observed by Van Putten and Kallman in mouse sarcoma?
What is the primary advantage of using hypoxia cell sensitizers over increasing oxygen delivery to tumor cells?
What is the primary advantage of using hypoxia cell sensitizers over increasing oxygen delivery to tumor cells?
