Claimed object relates to X-ray equipment, in particular X-ray radiators, intended for use, as in industry, and medicine, and also in devices for inspecting baggage.To pistacea operation of creation of X-ray tube with elements of marking direction central beam.Effect utility model is expressed in NII to increase the accuracy of mounting additional equipment, for example slit collimator on x-ray radiator. It is achieved, that in x-ray tube, containing cathode and anode, fixed in vacuum flask, having outlet window round from a radiotransparent material, on outer surface of output window groove is made cruciform shape, depth of 0.3 - 0.7 mm with width lines 0.5 - 1.0 mm, filled with phosphor with external protective light-layer, center of slot is aligned with central beam X-ray tube.