Deconvoluting a Pb in zircon profile from [48].

<p>(a) shows an apparent Pb Lα profile between Pb-doped and Pb-free zircon, generated by CASINO [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0241788#pone.0241788.ref020" target="_blank">20</a>], using an incident beam at 25 kV with a nominal 2 μm diameter. From the fit, σ = 693 nm, hence FWHM = 1633 nm. However, because [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0241788#pone.0241788.ref048" target="_blank">48</a>] analysed a section 30° from normal to the interface, the relevant FWHM is 1633/~2 ≈ 816 nm. (b) shows the [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0241788#pone.0241788.ref048" target="_blank">48</a>] EPMA profile, deconvoluted. Convolution has an effect of <0.01 log₁₀D units in this case.</p>