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Flashcards in Chapter 29 Deck (23)
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ALARA concept

A radiation protecting concept that states all exposures should be kept " as low as reasonably achievable"

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Anode

The positive electrode in the X-ray tube/glass envelope.

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Atom

The basic unit of matter

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Cathode

The negative electrode in the X-ray tube/glass envelope

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Contrast

Differences in densities on adjacent areas of a radiograph

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Density

The overall blackness on a radiograph

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Electromagnetic radiation

The production of. Wavelike energy through space and matter

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Frequency

The number of wavelengths passing through a fixed point per given period of time

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Ion

An electrically charged particle.

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Ionization

The process through which electrons are lost from the shell of an atom

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Ionizing radiation

Radiation that is capable of producing ions by adding or removing electrons from the shell of an atom

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Leakage radiation

Radiation that escapes or leaks out of the tube head

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Molliampere(mA)

A unit of measurement used to determine the amount of electrical current;1 mA is equal to 1/1000 of an ampere

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Photon

Small bundle of pure energy that has no mass or weight

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Primary radiation

Initial radiation produced at the tungsten target that exits the tube head

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Radiograph

A recorded image on photographic film

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Radiolucent areas

Dark portions of a radiograph that represents soft tissues (for example, dental pulp) that allow X-rays to pass through; space and air are also radiolicient

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Radiopaque areas

Light or white portions of a radiograph that represent areas of dense tissue that absorbs X-rays, not allowing them to pass through; examples include enamel, Denton,bone, and various metal reatorations

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Scatter radiation

A form of secondary radiation that occurs once the primary beam has interacted with matter and then is deflected off in a different direction.

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Secondary radiation

Occurs when the primary beam comes in contact with and passes through any type of matter

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Tungsten target

Portion of the anode struck by electrons ( focal spot )

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Wavelength

Distance between the crests or high point of the radiation waves

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X radiation(X-ray )

High energy ionizing electromagnetic radiation