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RAD PHYSICS ch 13
Terms in this set (65)
the process of heating the filament to burn off electrons is known as ______.
as the filament current increases, the temp of the filament _______ and the rate of the electron emission ______.
if no kilovoltage is applied across the tube, the electrons remain near the filament as a ___________.
space charge cloud
when kilovoltage is applied between the filament and the target such that the cathode is ______ charged and the anode is ______ charged, electrons are driven towards the anode at a high speed.
as the kVp increases, the speed of electrons _____.
the electron stream crossing the gap between the cathode and anode is the ____, measured in mA.
if the speed of the electrons is great enough _______ are produced.
ninety nine percent of all target interaction produce _____ and one percent produce _______.
heat; xrays photons
the cathode and anode are enclosed in a thick Pyrex glass tube with a thinner ______, where x-rays exit the tube
the tube contains as perfect a vacuum as possible, created by a process known as _____.
the cathode assembly consists of the ____, ____, and _____.
filament, wires, and focusing cup
the filament is a small coil of _____.
the filament is mounted on two wires that support it and carry current. one wire carries the low voltage current used to ____________ and the other wire carries the high voltage that is used to __________
heat filament; P.D.
a negatively charged concave metal _____________ is located behind the filament
the purpose of the focusing cup is to confine the electrons to a narrow beam and focus them as the ___________ on the tungsten target
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