Long term ⁷Be deposition in Romania

Area of Science:

• Environmental Science
• Radiochemistry
• Atmospheric Physics

Background:

• Beryllium-7 (⁷Be) is a cosmogenic radionuclide used as a tracer for atmospheric processes.
• Understanding ⁷Be deposition is crucial for environmental radioactivity monitoring.
• Romania's National Environmental Radioactivity Surveillance Network (NERSN) provides extensive data for such studies.

Purpose of the Study:

• To analyze the spatio-temporal variability of ⁷Be atmospheric deposition in Romania.
• To investigate the correlation between ⁷Be deposition and meteorological factors.
• To assess the influence of solar activity on ⁷Be deposition.

Main Methods:

• Monthly ⁷Be deposition data from 29 NERSN stations (1979-1995) were analyzed.
• High-resolution gamma-ray spectrometry was used to measure ⁷Be activity.
• Statistical analysis was employed to correlate deposition data with precipitation, temperature, and sunspot numbers.

Main Results:

• ⁷Be deposition exhibited a strong seasonal trend, mirroring precipitation patterns (highest in spring/summer, lowest in winter).
• Annual deposition fluxes varied significantly across stations and years, ranging from 164 to 1388 Bq/m²/y.
• A strong positive correlation was confirmed between ⁷Be deposition and precipitation, air temperature, and sunspot numbers.

Conclusions:

• Precipitation regime is the primary driver of ⁷Be deposition variability in Romania.
• Meteorological factors and solar activity play significant roles in modulating ⁷Be atmospheric transport and deposition.
• The study highlights the utility of ⁷Be as a tracer for atmospheric dynamics and deposition processes.