The invention relates to an X-ray tube (11/12) for high dosing performances, a corresponding method for the production of high dosing performances with X-ray tubes (11/12) and method for the production of corresponding X-ray devices (11/12), wherein an anode (31/32) and a cathode (21/22) are arranged opposite each other in a vacuumed internal chamber (41/42). Electrons (e−) are accelerated by means of high voltage which can be applied to the anode (31/32). The anode (31/32) is made of a metal layer having a high ordinal number which is used to convert the electrons (e−) into X-ray radiation (Y) with the aid of a coolant. The cathode (21/22) comprises an essentially transparent carrier material for X-ray radiation (Y) and an essentially transparent electron emitter layer for X-ray radiation (Y). According to the invention, the cathode (31/32) can, in particular, close the vacuumed internal chamber (41/42) from the outside.