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. 2017 Mar 10;7:43910. doi: 10.1038/srep43910

Figure 7. Backward-accelerated electrons characterisation using Gafchromic films.

Figure 7

(a) Spatial profile and (b) energy measurement using a filter with 1 to 4 layers of 50 μm Al sheets (square symbols); curves show the Al transmission for different electron energies obtained with Geant4.