EVIDENCE FOR A CORRELATION BETWEEN NUCLEAR DECAY RATES AND SOLAR ACTIVITY Ephraim Fischbach Physics Department Purdue University Unexplained periodic fluctuations in the decay rates of Si-32 and Ra-226 have been reported by groups at Brookhaven National Laboratory (Si-32), and at the PTB in Germany (Ra-226). We show from an analysis of the raw data in these experiments that the observed fluctuations are strongly correlated in time, not only with each other, but also with 1/R where R is the distance between the Earth and the Sun. In addition, observations made during the solar flare of 13 December 2006, support the implication that solar activity influences decay rates, perhaps via neutrinos. This implication is further supported by more recent work which has uncovered additional periodicities in both the BNL and PTB data characteristic of solar rotation. Some possible applications of these results to space travel, carbon-14 dating, and cancer treatment will also be discussed.