The principle that spreads heat over a greater area of the anode and allows the effective focal spot to be smaller than the actual focal spot
LINEFOCUS
How ninety-nine percent of an electrons kinetic energy is converted
HEAT
Keeps the electron cloud together before they leave the cathode
FOCUSINGCUP
Occurs when no more electrons can be boiled off the filament; limits x-ray tubes to a maximum of 1000 mA
SPACECHARGEEFFECT
Area where electrons strike the anode
FOCALSPOT
Environment inside the x-ray tube once all air has been removed
VACUUM
Graph that allows radiographers to determine the maximum technical factor combination that is safe for the x-ray tube
RADIOGRAPHICRATINGCHART
A coil of wire; source of electrons
FILAMENT
The product of kVp, mA, and time
HEATUNITS
Type of radiation emitted outside the tube housing; must be less than 1 mGy/hr at 1 m from the tube
LEAKAGERADIATION
Causes uneven distribution of x-ray intensity between the cathode and anode
HEELEFFECT
The positive electrode of an x-ray tube
ANODE
The process of boiling off electrons at the filament
THERMIONICEMISSION
The negative electrode of an x-ray tube
CATHODE
The anode is constructed of this material due to its high melting point
TUNGSTEN

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