An x-ray system for treatment cancer by delivering x-ray radiation directly to a desired region of tissue comprising an x-ray source with directed narrow space distribution of x-rays (linear accelerator), conditioning optics which direct and monochromotize x-ray radiation, an implantable needle with means for shaping beam installed across the x-ray beam, and expanding pipe-guide connecting conditioning optics with implantable needle whereby the energy, intensity, and space distribution of the delivered to the tumor x-ray radiation may be adjusted in accordance with the predefined treatment requirements.