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Figure 7
(A) MC simulation of a 10 keV photon beam impinging onto a sample composed of a 5 µm soft tissue film supported by a 5 µm thin glass substrate. Close to the soft tissue/glass interface, the dose in the soft tissue film is considerably increased by back-scattered photoelectrons from the glass. One should be aware of this effect when very thin solid-supported soft tissue films are studied. The effect can be more clearly seen in the percentage depth dose (PDD) curve along the z-axis for the central line marked by a black line in the cylindrical 2D profile. The region of increased sample dose is highlighted in gray. (B) For completeness, the inverse situation of transmitting first through the glass substrate and then the soft tissue has also been simulated.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 26| Part 4| July 2019| Pages 980-990
https://doi.org/10.1107/S1600577519006817
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