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26 Cards in this Set

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ANODE
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.
ATOMIC
the basic unit of matter, composed of a positively charged nucleus around which negatively charged electrons revolve.
ATOMIC NUMBER
the number of protons in the nucleus of an atom. The symbol is Z, and it is written as a subscript

BINDING ENERGY
the energy (expressed in electron volts) that binds the orbiting electrons around the nucleus of an atom
BREMSSTRAHULUNG
literally “breaking radiation” the release of a photon of energy by a bombarding electron slowed and bent off course by an atom.
CATHODE
the negatively charged side of a dental x- ray tube. It contains the tungsten film and the molybdenum focus cap.
CATHODE RAY
the stream of electrons and the x-ray to traveling from filament to target.
DUTY CYCLE
the number of seconds in a minute that a dental x-ray machine can be operated without overheating.
DUTY RATING
the number of consecutive seconds in a minute that a dental x-ray machine can be operated without over heating
ELECTROMAGNETIC RADIATION SPECTRUM
the spectrum of energy bearing waves whose properties are determined by wavelength x-rays are invisible electromagnetic radiations.
ELECTRON
a negatively charged particle which is a constituent of every neutral atom.
IONIZATION
the process by which an electrically stable or neutral atom or molecule gains or loses electrons and thereby acquires a positive or negative charge.
ISOTOPE
an atom whose nucleus has the same number of protons but a different number of neutrons.
MOLECULE
the smallest particle of a substance that retains the properties of the substance.
NEUTRON
a particle that has no charge, but has mass. It is found in the nucleus of an atom.
NUCLEUS
the positively charged relatively heavier inner core of an atom.
PHOTON
a discrete unit of energy
PROTON
a positively charged particle that has mass. It is found in the nucleus of an atom.
RADIATION
the emission and propagation of energy in the form of waves or particles.
RADIOACTIVE PROCESS
the process whereby certain unstable elements undergo spontaneous degeneration and produce high energy waves called gamma and particulate radiations.
RADIONUCLIDE
a radioactive substance
SHELL: (see orbit):
a prescribed path or ring in which electrons travel around the nucleus of an atom.
TARGET
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.
THERMIONIC EMISSION EFFECT:
production of free electrons by the passing of an electric current through a tungsten filament with resultant heat of the filament.
WAVELENGTH
the distance from the crest of one wave to the crest of the next wave. In radiology the wavelength is a measure of energy.
X-RAY
penetrating electromagnetic radiations having wavelengths shorter than those of visible light which are produced by bombarding a metal target with high speed electrons.