XANES spectra from a 25 mM aqueous solution of SeMet in 25% glycerol at 93 K. These spectra indicate the measured photoabsorption cross section of Se to photons of the indicated energy. The solid green spectrum was taken before the sample absorbed any significant dose (<1 MGy). The dashed brown line is a repeat of the same spectrum after the sample had absorbed a large dose (140 MGy). It is clear from these spectra that absorbed dose has an impact on XANES. The most prevalent change appears to be the loss of the so-called `white line' peak absorbance. The height of the `white line' peak (arrow) was used as the probe for the loss of the Se—C covalent bond.