X-ray microbeams based on Kumakhov polycapillary optics and its applications: Analytical consideration 21
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X-ray microbeams based on Kumakhov polycapillary optics and its applications: Analytical consideration 21

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2.2 Calculations and experimental results
Let us estimate the entrance intensity. Following [5], with intensity of the X-ray tube
W0 = 4.5 × 1012 photons/s, and critical angle of the total external reflection for 8 keV
θcr = 4 mrad
Win = W0θ2
cr4 = 4.5 × 1012 × 4 × 10−3
2
4 = 1.8 × 107 photons/s. (8)
In the work described in [7], a beam of 25 μm diameter at a distance of 1 mm from the
output of a polycapillary column is obtained.