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Rectification
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The transformer of a small X-ray unit supplies
the tube with alternating high–tension current, in other words it
alternately surges first in one direction–from cathode to anode.
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However, the right–tension current cannot flow
from anode to cathode because the anode is " cold ", and does not
have a supply of electrons to carry the current (unless the tube is
overloaded).
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This property of the tube to act as a valve and
so suppress the reverse cycle is termed self-rectification. In
apparatus in which the tube has a heavier load, additional
precautions have to be prevent such reversed flow of current through
the tube.
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This is achieved by inserting a rectifying valve
in the circuit supplying current to the tube. The current will flow
through the tube only during the forward half cycle and this
arrangement is known as half-wave rectification.
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