Radiation technology #06

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Modern x ray tubes :- these are of two type
(A) stationary anode x ray tube
(B) Rotating anode x ray tube
(A) stationary anode x ray tube - 

The stationary anode x ray tube have a stationary anode.
→There are a Tungsten's plate embedded on a thick copper block.
→A considerable amount of heat is generated in the focal spot (the area where the beam of electrons coming from the cathode strike to) of a stationary anode. 
→Copper block works as a remove of heat by conduction process and provide connection to positive electrode supply (+)
→There are the focal spot of electron beam is on tungsten.
→These tubes are used in portable x ray machine, and low power x ray units.
(B) Rotating anode x ray tube :-
Rotating anode x ray tube have a anode which is rotated by motor mechanism and provide a large area to strike electrons.
→A considerable amount of heat is generated in the focal spot (the area where the beam of electrons coming from the cathode strike to) of a stationary anode. Rather, a rotating anode lets the electron beam sweep a larger area of the anode, thus redeeming the advantage of a higher intensity of emitted radiation, along with reduced damage to anode compared to its stationary state.

→The rotating anode x ray tube rotate and provide 100 times more focal spot area.
→The anode disc is made up of tungsten+ rhenium (90%+10%) which is connected by molybdenum stem to stator and rotor to supporting assembly.
→The capacity of rotating anode x ray tube is larger then stationary.
→The rotating anode x ray tubes are used in high power x ray units, ct scanners, etc.

References-- Stewart c. bushong(book)
                         K. Thylon(book)
                        Wikipedia
                                ... . ...By Kushagra Sharma

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