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Half Value Layer "HLV"
Thickness of a material needed to attenuate the xray intensity by 50%
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Law of Bergonie' and Tribondeau
radiosensitivity related to younger, more undifferentiated cells with high metabolic activity.
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According to the Law of Bergonie' and Tribondeau what are radiosensitive cells?
lymphoid tissue, marrow, gonads
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According to the Law of Bergonie' and Tribondeau what are radioresistant cells?
brain, spinal cord, muscle
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Roentgen
unit of exposure to ionizing radiation
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REM
Roentgen Equivalent in Man
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RAD
Radiation Absorbed Dose
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What is the most important means of radiological protection?
collimation
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How does collimation protect?
decreases the size of the beam, decreases exposure, increases contrast, decrease scatter radiation and penumbra
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What is dosimetry?
radiation detection devices e.g. badges
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What is the most common reason for radiological retakes?
motion, darkroom/processing errors
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What is the 10 day rule?
Safest period to take an x-ray on a female. 10 days following the onset of menses. (10 days after bleeding).
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