Year: 2025
Type: conference-paper
Abstract: This study provides a detailed radiological characterization of groundwater from public fountains in Nikolaevka, Varna Region (Bulgaria), using high-sensitivity γ-spectrometric analysis. Samples collected in July 2025 were analyzed for natural radionuclides (Ra-226, Pb-210, K-40, U-235, Th-234, Bi-214) and anthropogenic isotopes (Cs-137, Cd-109). Moderately elevated Ra-226 (4.5–6.0 Bq kg⁻¹) and Pb-210 (5.1–6.4 Bq kg⁻¹) activities indicate a natural origin from uranium-bearing sedimentary formations. The estimated annual effective dose from direct consumption remains below the WHO guideline of 0.1 mSv yr⁻¹, though cumulative exposure, particularly to Ra-226 and Pb-210, may pose a long-term risk under exclusive water use. Slight but consistent differences between public drinking-water fountains reflect lithological and hydrogeological heterogeneity within the aquifer system. These results highlight the need for systematic monitoring and targeted management of unregulated water sources to ensure safe water supply in rural communities.
DOI: 10.70456/tjva2588
Institution: Technical University of Varna
Language: English
Subfield: Radiation
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W7128380960