Modern Dental Assisting Chapter 38

Front 1

ALARA concept

Back 1

concept of radiation protection that states all exposure should be kept at "as low as reasonable acheivable"

Front 2

Anode

Back 2

The positive electrode in the x-ray

Front 3

Atom

Back 3

The basic unit of life

Front 4

Bremsstrahlung radiation

Back 4

"Braking radiation" The sudden deceleration of electrons as they interact

Front 5

Cathode

Back 5

The negative electrode in the x-ray tube

Front 6

Central ray

Back 6

X-rays at the center of the beam

Front 7

Contrast

Back 7

Differences in degrees of blackness on an image

Front 8

Control panel

Back 8

The portion of the x-ray unit that contains the master switch, the indicator light the selector buttons and the exposure button

Front 9

Density

Back 9

The overall darkness or blackness on an image

Front 10

Dental Radiography

Back 10

The process of of recording images of the teeth and adjacent structures by exposure to x-radiation

Front 11

Dental imaging

Back 11

A filmless method of capturing an image and displaying it by using an image receptor , an electronic signal and a computer to process and store the image

Front 12

Distortion

Back 12

change in the size of an image caused by incorrect vertical angulation

Front 13

Dose

Back 13

The amount of energy absorbed by tissues

Front 14

Dosimeter

Back 14

A device used to detect and measure an accumulated dosage of radiation

Front 15

Electron

Back 15

A negatively charged particle in the atom

Front 16

Energy

Back 16

the ability to do work

Front 17

Extension

Back 17

Flexible arm that is attached to the x-ray tubehead

Front 18

Image receptor

Back 18

A recording medium for an image, normally film, phosphor storage plate(psp) or a digital sensor

Front 19

Intensity

Back 19

The total energy of the x-ray beam

Front 20

Ion

Back 20

An electrically charged particle

Front 21

Ionization

Back 21

Process by which electrons are removed from atoms, causing harmful effects of radiation in humans

Front 22

Ionizing

Back 22

Radiation that produces ionization resulting in harmful effects

Front 23

Kilovoltage

Back 23

Highest voltage of x-ray tube used in during an exposure

Front 24

Milliampere

Back 24

One one-thousand (1/1000) of an ampere, a unit of measurement used to describe the instensity of an electrical current

Front 25

Penumbra

Back 25

The blurred or distinct area that surrounds an image

Front 26

Photon

Back 26

A minute (tiny) bundle of pure energy that that has no weight or mass

Front 27

Primary beam/radiation

Back 27

The most penetrating beam produced at the target of the anode

Front 28

Radiation

Back 28

forms of waves of energy emission through space or material

Front 29

Scatter radiation

Back 29

A form of secondary radiation that occurs when an x-ray beam has been deflected from its paths by interaction with matter

Front 30

Secondary radiation

Back 30

Radistion that is created when the primary beam interacts with matter

Front 31

Tubehead

Back 31

The part of teh x-ray unit that contains the x-rays tube, the high voltage and low -voltage transformers and insulating oil

Front 32

Tungsten target

Back 32

A focal spot in the anode