Moreover, high-energy x-ray quanta will pass through the glass walls of the polycapillary structure and this will
cause the image of the focal spot to become “blurred,” which restricts the use of the present technique at high voltages of the
tube . The approximate working range of Kumakhov optics is 1–100 keV. Polycapillary structures with increased content
of lead in the glass must be employed to achieved harder voltage .
With the use of divergent polycapillary systems, it becomes possible to achieve an increase in the x-ray image of the
spot, which in turn makes it possible to expand the range of spots employed towards lesser dimensions . According to the
data presented in , it is possible to obtain images with submicrometric resolution.
Thus, through the use of the polycapillary structures of Kumakhov optics it is possible to implement a precise, reliable,
and quick technique for determining the parameters of the focal spot of an x-ray tube. The method is a development
of the technique of slit collimators that produces greater precision, higher information content, and convenience. The technique
may find application both in the manufacture of x-ray sources, for purposes of testing, as well as among users, during
the tuning period.