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

Research output: Contribution to journalArticlepeer-review


  • Drago Brodnik
  • Dennis Glavič-Cindro
  • Dennis Glavič-Cindro
  • Marijan Nečemer
  • Petra Maver-Modec
  • Toni Petrovič
  • Tim Vidmar
  • Branko Vodenik
  • Benjamin Zorko

Institutes & Expert groups

  • JSI - Jozef Stefan Institute
  • Danfoss Trata d.o.o.

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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.


Original languageEnglish
Pages (from-to)290-295
Number of pages6
JournalArchives of Industrial Hygiene and Toxicology
Issue number4
Publication statusPublished - 1 Dec 2019


  • aerosols, assessed radiation doses, cosmogenic radionuclides, dry deposition, systematic influences, wet deposition

ID: 5927049