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36 Cards in this Set

  • Front
  • Back
Positively charged electrode
Negatively charged electrode
Electromagnetic radiation
Method of transporting energy through space, distinguished by wavelength, frequency and energy
Electromagnetic Spectrum
Electromagnetic radiation grouped according to wavelength and frequency
process in which an electron is moved to a higher energy level within the atom
number of cycles of the wave that pass stationary point in a second
process by which an outer electron is removed from the atom so that the atom is left positvely charged
Photons / Quanta
bundle of radient energy
Radiant energy
energy contained in light rays or any other form of radiation
visible photographic record on film produced by xrays passing through an object
distance between two corresponding points on a wave
Xray Discovery
Roentgen 1895
increase in speed over time
Actual focal point
area of the focal spot consisting of coiled wire that is perpendicular to the surface of the target
restricting device used to control the size of the primary xray beam
control panel of the xray machine
Effective focal spot
area of the focal spot that is visible through the xray tube window and directed toward the xray film
part of a low energy circuit in the cathode that, when heated, releseas electrons from their orbits
Focal spot
small area of the target with which electrons collide on the anode
Focusing cup
recessed are where the filament lies, directing the electrons toward the anode
Full-wave rectification
creates an almost constant electrical potential across the xray tube, converting the positive electrical current pulses to 120 times per second compared with the normal rate of 60 tps
Half-wave rectification
method of converting alternating to direct current in which half of the current is lost
Heel effect
decrease in xray intensity on the anode side of the xray beam caused by the anode target angle
amount of electrical energy being applied to the anode and cathode to accelerate the electrons from the cathode to the anode
Kilovoltage peak (kVp)
peak energy of the xrays which determines the quality (penetrating power) of the xray beam
Milliamperage (mA)
amount of electrical energy being applied to the filament. mA describes the number of xrays produced during exposure
metal commonly used in focusing cups because of its high melting point & poor conduction of heat
partial outer shadow of an object being imaged by illumination
process of changing alternating current to direct current
Rotating anode
turns on an axis to increase xray production while dissipating heat
Stationary anode
nonmoving, found in dental, small portible units
Step-down transformer
reduces xray machine input voltage from 110 or 220 V to 10V to prevent burnout of cathode filament
Step-up transformer
increases the incoming voltage of 110 - 220 V to thousands of volts
metal that makes up filament
4 things needed for xrays
1. source of electrons
2. method of acceleration
3. free path of flow
4. target - anode