Seasonal Changes of the $${}^{\mathbf{212}}$$Po Half-Life Solar-Daily Variation Parameters

Results of a search for the masked regularities in the $${}^{212}$$ Po $$\alpha$$ -active isotope half-life solar-daily variation parameters in the data collected during 2019–2021 years are presented. It is shown, that amplitude of a sinusoidal function approximating half-life solar-daily dependence obtained by averaging data during 90 days for each season of the years could reach $$1.0\times 10^{-3}$$ from the average daily value. A comparison of the time dependences the normalized $${}^{212}$$ Po and $${}^{213}$$ Po half-life values averaged during the seasons of 2019–2021 year measured interval is carried out and examined. The new value of the $${}^{212}$$ Po half-life which is $$\tau({}^{212}\textrm{Po})=(293.23\pm 0.04)$$ ns was obtained on the base of the data collected during 2019–2021 years.