Periodic variations in time of atmospheric alpha and beta radioactive nanoparticles

Measured from January 2016 to June 2018. By means of spectral analysis method, we have analyzed time variations and showed the presence of existing natural variations, mechanisms of which were described by the authors in previous works. Authors measured the activity of natural beta-active radionuclides of radon's daughter decay products (DDP) in the surface layer of the atmosphere. The measurements were performed with a beta-spectrometer “Progress” scintillation detector, which is located on the third floor of the Faculty of Physics and Technology at al-Farabi Kazakh National University (KazNU). Measurements of beta spectra were carried out with an exposure of at least for 2000 seconds and during the day up to 10 beta spectra were recorded. The built up time dependence of the integral values of the spectra shows that seasonal variations of natural beta-active radionuclides are manifested on the background of diurnal fluctuations. Thus, 1 day, 4 day, 7 day, 16 day and 30 day variations were found.