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WorksheetsRAD Chapter 3
Total questions: 10
Worksheet time: 5mins
(1) All ionizing radiations cause damage to living tissues. (2) Although very little radiation is used in dentistry, damage to the cells does occur.
Both statements are true.
Both statements are false.
What specific mechanism of radiation injury may result in the formation of hydrogen peroxide when x-ray energy is absorbed by patients?
An ejected high-speed electron may interact with other atoms within absorbing tissues.
Free radical formation created by the ionization of water may occur.
Which of the following statements is true regarding the direct theory of radiation injury?
It involves the formation of toxins that damage the cell.
It involves damage to the critical areas of a cell through direct contact with the x-ray photon.
The indirect theory proposes that
toxins are created from the formation of free radicals.
ionizing radiation strikes critical areas within cells.
According to the dose-response curve, when dose and damage are plotted on a graph, a _____________________ relationship is seen.
nonlinear, nonthreshold
linear, nonthreshold
A nonthreshold dose-response curve suggests that
radiation exposure above the threshold amount causes some damage to tissues.
radiation exposure, no matter how small, causes damage to living tissue.
Stochastic biologic effects from radiation
are directly related to exposure and effect.
occur as a result of exposure, but severity is not determined by dose.
Which of the following is an example of stochastic effects?
Erythema
Cancer
___________ refers to the total amount of radiation that is received or absorbed.
Total dose
Dose rate
(1) More radiation damage takes place with high dose rates (2) because a rapid delivery of radiation does not allow time for cellular damage to be repaired.
Both statements are true.
Both statements are false.
