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Non-dependence of nuclear decay rates of 123 I and 99m Tc on Earth-Sun distance.
Applied Radiation and Isotopes 2018 Februrary
Recently published studies have suggested an annual fluctuation of the decay rate of several radionuclides, in particular 32 Si and 226 Ra. Variation of solar neutrino flux caused by variation of Earth-Sun distance has been proposed as the mechanism of this fluctuation. In this study we prospectively look at two radionuclides which have not previously been studied for annual variation, 123 I and 99m Tc. Half-lives of samples of these radionuclides were measured approximately weekly and semiweekly respectively over a period of 2 years. Spectral analysis using the Lomb-Scargle method demonstrated no significant periodicity, and in particular, no evidence for a period of 1 year.
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