Borrello Joseph A, Wuosmaa Alan, Watts Mark
Advanced Radiology Services, 3264 N Evergreen Dr, Grand Rapids, MI 4952, United States.
Department of Physics, University of Connecticut, 2152 Hillside Road, U-3046, Storrs, CT 06269, United States.
Appl Radiat Isot. 2018 Feb;132:189-194. doi: 10.1016/j.apradiso.2017.12.006. Epub 2017 Dec 8.
Recently published studies have suggested an annual fluctuation of the decay rate of several radionuclides, in particular Si and 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, I and 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.
最近发表的研究表明，几种放射性核素，特别是硅和镭的衰变率存在年度波动。地球与太阳距离变化引起的太阳中微子通量变化被认为是这种波动的机制。在本研究中，我们前瞻性地研究了两种以前未研究过年度变化的放射性核素，碘和锝。在两年的时间里，分别大约每周和每半周测量一次这些放射性核素样品的半衰期。使用 Lomb-Scargle 方法的光谱分析表明没有明显的周期性，特别是没有一年周期的证据。
