The X ray generator according to the second aspect of the invention includes {TAIL ~ a hot cathode} heated by {HEAD ~ electrons} which are emitted by a cold cathode electron emission source made of carbon material , so that a high voltage cable is given no large current 
The X ray generator according to the second aspect of the invention includes { TAIL ~ a hot cathode } heated by { HEAD ~ electrons } which are emitted by a cold cathode electron emission source made of carbon material , so that a high voltage cable is given no large current
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