Radioactive sources presented annual periodical half-life changes in several accurate measurements, although customary practice claims that radioactive decay should be a physical constant for each radionuclide. Besides that, the Purdue measurements of Mn-54 decay-rates indicated response to solar X-ray flare events in 2006. The Mn-54 source emits neutrino from the nucleus and therefore allows interpreting those solar neutrinos can interact with this radiation source. In order to track more radiation count-rate responses to solar flare events, we built an experimental detector system for gamma radiation count-rates measurements, facing an Am-241 source. The system was placed at an underground laboratory, permanently locked to avoid any influence by unexpected radiation perturbations, and environmentally controlled in means of temperature and clean-air flow, in order to maintain detector stabilization. The detector consist of NaI(Tl) scintillators for gamma radiation and total-counting reader devices for remote counting. Each radiation counting system was shielded by a 5 cm lead. One month prior to flare events from the Sun, all three detectors showed reasonably stable count-rates, which were tallied every 15 minutes. Five solar-flares occurred and reported by the SpaceWeatherLive website on 12th to 13th of October 2018. The Am-241 system response to solar flares found to be with a delay of around 20 days. We conclude that also for alpha emitter radioactive sources, the half-life altered due to changes of neutrino flux from the Sun. Our measurements indicated that an alpha emitter was affected by the neutrino flux change from the Sun.
|Published - 26 Feb 2019