| 摘要 |
The invention relates to an X-ray tube ( 11 ) with a cathode that emits electrons (e-) into an interior chamber ( 40 ) that is under vacuum, and with a target ( 31, 32 ), configured as an anode, for generating high-dose X-radiation (gamma), the cathode comprising at least one cold cathode ( 21, 22, 23 ) based on an electron (e-) emitting material having a field-enhancing structure ( 70 ). The invention especially relates to an X-ray tube ( 11 ) having a cold cathode ( 21, 22, 23 ) that comprises at least one support layer ( 201 ) for holding the electron (e-) emitting material, the emission area of the cold cathode ( 21, 22, 23 ) being defined by the shape of the support layer ( 201 ).
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