1is a grounded metal box filled with oil
transformer
2a transformer contains:
low voltage transformer and high voltage transformer
3transformer used for filament circuit
low voltage transformer
4transformer used for the high voltage circuit
high voltage transformer
5consist of two wire coils wrapped around a closed core
transformer
6the circuit containing the first coil (connected to the available electric energy source) is called the _
primary circuit
7the circuit containing the second coil (which comes the modified electric energy) is called the _
secondary circuit
8when the cathode is negative with respect to the anode, electrons flow at high speed from the _ to the _ and xrays are produced
cathode; anode
9is the process if changing alternating current into direct current
rectification
10provides an alternating voltage for the xray tube
high voltage transformer
11used to change the potential difference of the incoming electric energy to the appropriate level
transformer
12types of rectifier
vacuum tube rectifiers
solid state rectifiers
13type of rectifier that are smaller, more reliable, and have a longer life
solid state rectifier
14was the first material used for solid state rectifiers
selenium
15today, most xray generators use _ rectifiers
silicon
16a single silicon rectifer (also called _ ) will resist a reverse voltage of about _V, which is 10-20 times higher than a selenium rectifier
cell; 1000V
17silicon rectifiers can withstand a temperature of up to _, considerably higher than selenium at _
392 degrees C; 266 degrees C
18is made up of a number of cells, or individual diodes, connected together to form a cylindrical stack that might have dimensions of 20-30 cm long by 20 mm diameter. such rectifier can operate up to 150 kVp and 1000 mA
silicon rectifier
19it would be highly undesirable to have electrons moving from the target to the filament for two reasons:
such electrons would not produce useful xrays
such electrons would further heat the filament and reduce its lifetime
20is a device that allows an electric current to flow in one direction but does not allow current in other direction
rectifiers
21are incorporated into the xray circuit in series with the xray tube
rectifier