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7 Cards in this Set
- Front
- Back
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Ionization |
Results in the formation of a positive atom and a dislodged negative electron. |
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Free radical formation |
An uncharged or neutral atom or molecule that exists with a single, unpaired electron in its outer shell.
Highly reactive and unstable Water is broken into free radicals by x-ray energy Ionization of water is the most common mechanism of damage in humans Free radicals combine with ordinary molecules to form a toxin (ie. Hydrogen peroxide H2O2.. capable of producing widespread cellular changes) |
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Radiation injury sequence |
Latent period- the time between exposure and the appearance of observable clinical signs Period of injury follows: cellular changes Recovery period: some cells can repair the damage
Cumulative effects: repeated radiation, additive damage |
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Exposure |
FMX- 3-7 Days of background radiation PANO = 4 BW First sign of overexposure: Erythema |
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Radiation Effect on Cells |
The response of a cell to radiation exposure determined by:
Mitotic activity: cells that divide frequently Cell differentiation: cells that are immature Cell metabolism: cells that have higher metabolism |
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**Cell Sensitivity to Radiation |
HIGH: reproductive tissue, lymphoid system, bone marrow, intestines, mucous membranes MEDIUM: fine vasculature, growing cartilage & bone, salivary glands, lungs, liver and kidney LOW: nerve tissue, skeletal muscle, heart, mature bone, optic lense |
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Radiation Measurements |
Air = Roengten = Couloumb/kg Dose = Rad = Gray (Gy) Dose equivalent = Rem = Sievert (Sv) |
