Dental Radiology

Front 1

ANODE

Back 1

the positively charged side of the dental x-ray tube. It contains the tungsten target at which the electrons are aimed and from which x-rays are emitted.

Front 2

ATOMIC

Back 2

the basic unit of matter, composed of a positively charged nucleus around which negatively charged electrons revolve.

Front 3

ATOMIC NUMBER

Back 3

the number of protons in the nucleus of an atom. The symbol is Z, and it is written as a subscript

Front 4

BINDING ENERGY

Back 4

the energy (expressed in electron volts) that binds the orbiting electrons around the nucleus of an atom

Front 5

BREMSSTRAHULUNG

Back 5

literally “breaking radiation” the release of a photon of energy by a bombarding electron slowed and bent off course by an atom.

Front 6

CATHODE

Back 6

the negatively charged side of a dental x- ray tube. It contains the tungsten film and the molybdenum focus cap.

Front 7

CATHODE RAY

Back 7

the stream of electrons and the x-ray to traveling from filament to target.

Front 8

DUTY CYCLE

Back 8

the number of seconds in a minute that a dental x-ray machine can be operated without overheating.

Front 9

DUTY RATING

Back 9

the number of consecutive seconds in a minute that a dental x-ray machine can be operated without over heating

Front 10

ELECTROMAGNETIC RADIATION SPECTRUM

Back 10

the spectrum of energy bearing waves whose properties are determined by wavelength x-rays are invisible electromagnetic radiations.

Front 11

ELECTRON

Back 11

a negatively charged particle which is a constituent of every neutral atom.

Front 12

IONIZATION

Back 12

the process by which an electrically stable or neutral atom or molecule gains or loses electrons and thereby acquires a positive or negative charge.

Front 13

ISOTOPE

Back 13

an atom whose nucleus has the same number of protons but a different number of neutrons.

Front 14

MOLECULE

Back 14

the smallest particle of a substance that retains the properties of the substance.

Front 15

NEUTRON

Back 15

a particle that has no charge, but has mass. It is found in the nucleus of an atom.

Front 16

NUCLEUS

Back 16

the positively charged relatively heavier inner core of an atom.

Front 17

PHOTON

Back 17

a discrete unit of energy

Front 18

PROTON

Back 18

a positively charged particle that has mass. It is found in the nucleus of an atom.

Front 19

RADIATION

Back 19

the emission and propagation of energy in the form of waves or particles.

Front 20

RADIOACTIVE PROCESS

Back 20

the process whereby certain unstable elements undergo spontaneous degeneration and produce high energy waves called gamma and particulate radiations.

Front 21

RADIONUCLIDE

Back 21

a radioactive substance

Front 22

SHELL: (see orbit):

Back 22

a prescribed path or ring in which electrons travel around the nucleus of an atom.

Front 23

TARGET

Back 23

the part of the anode that the high speed electrons strike and that produces x-rays and heat. In dental x-ray tubes the target is usually made of tungsten.

Front 24

THERMIONIC EMISSION EFFECT:

Back 24

production of free electrons by the passing of an electric current through a tungsten filament with resultant heat of the filament.

Front 25

WAVELENGTH

Back 25

the distance from the crest of one wave to the crest of the next wave. In radiology the wavelength is a measure of energy.

Front 26

X-RAY

Back 26

penetrating electromagnetic radiations having wavelengths shorter than those of visible light which are produced by bombarding a metal target with high speed electrons.