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Concept of radiation protection that states that all exposures should be kept as low as reasonably.
Alara Concept
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The negative electrode in the x-ray tube.
Cathode
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X-ray at center of beam.
Central Ray
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Differences in degrees of blackness on a radiograph.
Contrast
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The portion of the x-ray unit that contains the master switch, the indicator light, the selector buttons, and the exposure button.
Control Panel
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The overall darkness or blackness of a radiograph.
Density
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Change in the size of an image on a radiograph caused by incorrect vertical angulation.
Distortion
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Flexible arm that is attached to the x-ray tubehead.
Extension Arm
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A small round opening in a bone through which blood vessels, nerves, and ligaments pass; plural, foramina
Foramen
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Process by which electrons are removed from atoms, causing the harmful effects of radiation in humans.
Ionization
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Highest voltage of radiograph tube used during a radiograph exposure.
Kilovoltage
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Time between exposure to ionizing radiation and appearance of symptoms.
Latent Period
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Device used to protect the reproductive and blood-formaing tissues from scatter radiation.
Lead Apron
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The strongest and most obvious muscle of mastication.
Masseter
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One one-thousandth (1/1000) of an ampere, a unit of measurement used to describe the intensity of an electrical current.
Milliampere
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Forms of waves of energy emission through space or material.
Radiation
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A form of secondary radiation that occurs when an x-ray beam has been deflected from its path by interaction with matter.
Scatter Radiation
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Joint on each side of the head that allows for movement of the mandible.
Temporomandibular Joint
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The part of the x-ray unit that contains the x-ray tube, thr high-voltage and low-voltage transformers, and insulating oil.
Tubehead
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The process of the maxillary bones that extends upward to articulate with the zygomatic bone.
Zygomatic Process
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