A Strange Connection: Could Nuclear Decay Rates be Influenced by Distance From the Sun?

The decay rate of the radioactive isotope 32Si appears to correlate with orbital distance from the Sun (Jenkins et al. 2008)
The decay rate of the radioactive isotope 32Si appears to correlate with orbital distance from the Sun (Jenkins et al. 2008)

Wouldn’t you think that the decay rates of isotopes found on Earth would remain fairly constant under controlled conditions? Statistically-speaking one would be able to make a pretty good prediction about a radioactive element’s decay rate at any point in the future, regardless of external influences. However, a group of researchers have found the radioisotope decay rates of radium (226Ra) and silicon (32Si) varies periodically. This may not seem strange at first, but when measured, this fluctuation in decay rate has a period of approximately a year. Does this relate to the Earth’s position in its orbit? Does this mean radioactive decay rates are influenced depending on how far the element is from the Sun? Perhaps decay rates are not as predictable as we think…
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