Negative correlation between the number of sunspots and the occurrence of 7Be and 22Na in the surface air and their contribution to radiation doses

Brodnik, Drago; Glavič-Cindro, Denis; Korun, Matjaž; Nečemer, Marijan; Maver-Modec, Petra; Petrovič, Toni; Vidmar, Tim; Vodenik, Branko; Zorko, Benjamin

doi:10.2478/aiht-2019-70-3336

Abstract

This article presents yearly mean concentrations of cosmogenic radionuclides ⁷Be and ²²Na occurring in dry and wet depositions (fallout) and aerosols. Time dependencies negatively correlated with the yearly mean number of sunspots. Activity concentrations of ⁷Be and ²²Na in aerosols in the surface air had a correlation of near-unity. ⁷Be in aerosols exhibited a smoother time dependence than ²²Na, implying that the production of ²²Na is more sensitive to the solar activity than the production of ⁷Be. The effect of the measured doses on the general population through internal and external exposure to radiation from cosmogenic radionuclides was small.

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Negative correlation between the number of sunspots and the occurrence of 7Be and 22Na in the surface air and their contribution to radiation doses

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