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Figure 5
(A) MC simulation of one-hundred 10 keV photons of a parallel beam (unpolarized, FWHM = 1 µm) which are constrained to interact in a 10 µm-thick layer of soft tissue (EGSnrc: option photon forcing enabled). Photon tracks are shown in green, electron tracks in blue. (B) Photon attenuation of photons in soft tissue according to the Beer–Lambert law [\Phi(z)] = [\Phi_0\exp[-\mu(E)z]] plotted for different photon energies E on a semi-logarithmic scale. For energies above 10 keV, attenuation can be neglected if the sample thickness is less than about 100 µm.

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SYNCHROTRON
RADIATION
ISSN: 1600-5775
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