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(a) Simulated XRF and scattered photon spectra showing a decrease in detected photon counts due to the attenuation of an excitation beam and emitted XRF photons as a function of the respective pathlengths d exc or d em in water, considering d exc = 0.2, 0.4, or 0.6 mm for d em = 0 and d em = 0.2, 0.4, or 0.6 mm for d exc = 0. (b) Decrease in XRF or scattered photon counts as a function d exc (top) or d em (bottom). [Color figure can be viewed at wileyonlinelibrary.com]
