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27 Cards in this Set
- Front
- Back
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What is the time between exposure to radiation and first clinical sign? |
Latent period |
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an uncharged molecule that has unpaired electrons on the outer shell, is highly reactive and unstable, also combines with molecules to form toxins is a |
Free radical |
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Direct radiation injury occurs when |
X-ray photons hit critical Target within the cell |
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Indirect radiation occurs when |
X-ray photons are absorbed and form toxins. |
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What relationship describes the response of tissues in radiation? |
Linear, non-threshold |
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What factors contribute to radiation injury? |
Total dose, dose rate, cell sensitivity, and age |
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Long-term effects are seen with small amounts of radiation absorbed in a long period. T F |
True |
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Radiation injuries that are not seen in the person and radiated but that occur in future generations are termed |
Genetic effects |
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Which of the following is most susceptible to ionizing radiation? |
Small lymphocyte |
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The sensitivity of tissues to radiation is determined by |
Mitotic activity, cell differentiation, cell metabolism |
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What is considered radioresistant? |
Mature bone cell, and other dense, non fast reproducing |
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The traditional unit for measuring x-ray exposure in air is termed |
The Roentgen |
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Which of the following radiation units is determined by the quality factor? |
The Rem |
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The unit for measuring the absorption of x-rays is termed |
The Rad |
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Which of the following traditional units does not have an SI equivalent? |
The Roentgen |
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What is used only for x-rays? |
The roentgen |
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What is the greatest contributor to artificial radiation exposure? |
Medical radiation |
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The amount of radiation exposure an individual receives varies depending on |
film speed, collimation, technique, & exposure factors |
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Is x-radiation harmful to living tissues |
Yes |
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What is the first step in limiting the amount of radiation a patient receives? |
Proper prescribing or ordering of dental radiographs |
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What is the amount of aluminum filtration needed for 70 kv or higher? Below 70 kv? |
Higher than 70kv 2.5 mm Below 70kv 1.5 mm aluminum filtration. |
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Which collimator is most effective at reducing radiation to the patient? |
Rectangular collimator |
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Inherent filtration |
takes place when the primary beam passes for the glass window of the X-ray tube, the insulating oil and The tube-head seal 0.5 to 1.0 mm aluminum |
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What what is the purpose of a lead apron? |
Placed over chest and lap to protect reproductive and blood-forming tissues from scatter radiation |
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When is the lead apron supposed to be used? |
All intra and extraoral procedures |
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What amount of reduction in radiation will there be to the patient its operator uses f speed instead of d speed film? |
60% reduction in exposure from D speed |
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What is MPD? what is the maximum per year? |
Maximum permissible dose, current M P D for occupational exposure person is 5 rems per year |
