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This article presents an analysis of about 29,000 measurements of gammaradiation associated with the decay of radon in a sealed container at theGeological Survey of Israel (GSI) Laboratory in Jerusalem between 28 January2007 and 10 May 2010. These measurements exhibit strong variations in time ofyear and time of day, which may be due in part to environmental influences.However, time-series analysis reveals a number of periodicities, including twoat approximately 11.2 year$^{-1}$ and 12.5 year$^{-1}$. We have previouslyfound these oscillations in nuclear-decay data acquired at the BrookhavenNational Laboratory (BNL) and at the Physikalisch-Technische Bundesanstalt(PTB), and we have suggested that these oscillations are attributable to someform of solar radiation that has its origin in the deep solar interior. Acurious property of the GSI data is that the annual oscillation is muchstronger in daytime data than in nighttime data, but the opposite is true forall other oscillations. This may be a systematic effect but, if it is not, thisproperty should help narrow the theoretical options for the mechanismresponsible for decay-rate variability.

Analysis of Gamma Radiation from a Radon Source: Indications of a Solar Influence