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Figure 3: Comparison of the shape and size of transmitted spectral energy distribution at ‘spectrally’ equivalent thicknesses of aluminum and copper fi lter materials. The spectrals compared are (i) without scaling, ÖAl(Ei) and ÖCu(Ei) and (ii) with scaling, ÖAl(Ei) and aÖCu(Ei)

Figure 3: Comparison of the shape and size of transmitted spectral energy distribution at ‘spectrally’ equivalent thicknesses of aluminum and
copper fi lter materials. The spectrals compared are (i) without scaling, ÖAl(Ei) and ÖCu(Ei) and (ii) with scaling, ÖAl(Ei) and aÖCu(Ei)