Analysis of beta-decay data acquired at the Physikalisch-Technische   Bundesanstalt: evidence of a solar influence
  According to an article entitled Disproof of solar influence on the decay rates of 90Sr/90Y by Kossert and N\"ahle of the Physikalisch-Technische Bundesanstalt (PTB) [1], the PTB measurements show no evidence of variability. We show that, on the contrary, those measurements reveal strong evidence of variability, including an oscillation at 11 year-1 that is suggestive of an influence of internal solar rotation. An analysis of radon beta-decay data acquired at the Geological Survey of Israel (GSI) Laboratory for the same time interval yields strong confirmation of this oscillation. 
Peter Sturrock, Gideon Steinitz, Ephraim Fischbach, Alexander   Parkhomov, Jeffrey Scargle
hep-ph physics.ins-det