Chapter 29 Flashcards

0
Q

Anode

A

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

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1
Q

ALARA concept

A

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

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2
Q

Atom

A

The basic unit of matter

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3
Q

Cathode

A

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

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4
Q

Contrast

A

Differences in densities on adjacent areas of a radiograph

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5
Q

Density

A

The overall blackness on a radiograph

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6
Q

Electromagnetic radiation

A

The production of. Wavelike energy through space and matter

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7
Q

Frequency

A

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

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8
Q

Ion

A

An electrically charged particle.

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9
Q

Ionization

A

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

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10
Q

Ionizing radiation

A

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

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11
Q

Leakage radiation

A

Radiation that escapes or leaks out of the tube head

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12
Q

Molliampere(mA)

A

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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13
Q

Photon

A

Small bundle of pure energy that has no mass or weight

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14
Q

Primary radiation

A

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

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15
Q

Radiograph

A

A recorded image on photographic film

16
Q

Radiolucent areas

A

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

17
Q

Radiopaque areas

A

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

18
Q

Scatter radiation

A

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

19
Q

Secondary radiation

A

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

20
Q

Tungsten target

A

Portion of the anode struck by electrons ( focal spot )

21
Q

Wavelength

A

Distance between the crests or high point of the radiation waves

22
Q

X radiation(X-ray )

A

High energy ionizing electromagnetic radiation