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40 Cards in this Set
- Front
- Back
Alara concept
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Concept of radiation protection that states that all exposures should be kept "as low as reasonably achievable."
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Anode
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The positive electrode in the x-ray tube.
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Atom
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The basic unit of matter.
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Cathode
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The negative electrode in the x-ray tube.
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Central ray
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X-rays at the center of the beam.
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Contrast
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Differences in degrees of blackness on a radiograph.
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Control panel
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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.
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Density
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The overall darkness or blackness of a radiograph.
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Dental radiography
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The process of making radiographs of the teeth and adjacent structures by exposure to radiographs.
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Distortion
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Change in the size of an image on a radiograph caused by incorrect vertical angulation.
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Dose (of radiation)
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The amount of energy absorbed by tissues.
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Electron
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A negatively charged particle in the atom.
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Energy
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The ability to do work.
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Extension arm
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Flexible arm that is attached to the x-ray tubehead.
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Genetic effects
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Effects of radiation that are passed on to future generations through genetic cells.
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Ion
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An electrically charged particle.
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Ionization
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Process by which electrons are removed from atoms, causing the harmful effects of radiation in humans.
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Ionizing radiation
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Radiation that produces ionization, resulting in harmful effects.
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Kilovoltage peak (kVp)
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Highest voltage of radiograph tube used during a radiograph exposure.
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Latent period
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Time between exposure to ionizing radiation and appearance of symptoms.
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Lead apron
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Device used to protect the reproductive and blood-forming tissues from scatter radiation.
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Magnification
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The proportional enlargement of a radiographic image.
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Master switch, indicator light, selector buttons, exposure button
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Components of control panel.
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Matter
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Anything that occupies space and has form or shape.
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Milliampere (mA)
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One one-thousandth (1/1000) of an ampere.
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Penumbra
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The blurred or indistinct area that surrounds an image.
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Photon
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A minute (tiny) bundle of pure energy that has no weight or mass.
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Primary beam
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The most penetrating beam produced at the target of the anode.
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Primary radiation
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Same as primary beam.
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Radiation
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Forms of waves of energy emission through space or material.
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Radiograph
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Image produced on photosensitive film.
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Radiology
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The science or study of radiation.
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Scatter 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.
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Secondary radiation
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X-radiation that is created when the primary beam interacts with matter.
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Sharpness
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A measure of how well the radiograph reproduces the fine details or outlines of an object.
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Somatic effects
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Effects of radiation that cause illness and are responsible for poor health but are not passed on to offspring.
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Thyroid collar
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A flexible lead shield that is placed securely around the neck.
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Tubehead
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The part of the x-ray unit that contains the x-ray tube, the highhvoltage and low-voltage transformers, and insulating oil.
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Tungsten target
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A focal spot in the anode.
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X-radiation
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High-energy ionizing electromagnetic radiation.
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