Surface roughness interpretation of 730 kg days CRESST-II results
  The analysis presented in the recent publication of the CRESST-II results finds a statistically significant excess of registered events over known background contributions in the acceptance region and attributes the excess to a possible Dark Matter signal, caused by scattering of relatively light WIMPs. We propose a mechanism which explains the excess events with ion sputtering caused by 206Pb recoils and alpha particles from 210Po decay, combined with realistic surface roughness effects. 
M. Ku\'zniak, M. G. Boulay and T. Pollmann
astro-ph.IM astro-ph.CO physics.ins-det