Fine structure of histograms of alpha-activity measurements depends on   direction of alpha particles flow and the Earth rotation: experiments with   collimators
  The fine structure of histograms of measurements of 239Pu alpha-activity varies periodically, and the period of these variations is equal to sidereal day (1436 minutes). The periodicity is not observed in the experiments with collimator that restricts the alpha particles flow to be oriented to the Polar Star. Based on this study and other independent data, such as measurements conducted by the Arctic expedition, and similarity of the histograms in processes observed at different locations at the same local time, the conclusion was made, that the fine structure of statistical distributions of the observed processes depends on the celestial sphere. 
Simon E. Shnoll, Konstantin I. Zenchenko, Iosas I. Berulis, Natalia V.   Udaltsova and Ilia A. Rubinstein