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Naturally occurring and technogenic radionuclides in Yerevan (Armenia) soils: Background values spatial distribution and stochastic health risk assessment

The activity concentration of both naturally occurring (NOR) (i.e. U-238, Th-232, K-40) and technogenic (Cs-137) radionuclides was determined on 51 soil samples collected across Yerevan, the capital of Armenia. Measures were carried out at Center for Ecological-Noosphere Studies National Academy of Sciences, RA (CENS) with a High Purity Ge detector-based gamma spectrometry system. Data were georeferenced and the Multifractal IDW (MIDW) interpolation was used to generate grid of the distribution patterns of radionuclide activity. The Concentration-Area (C-A) analysis was applied to grids [1] to determine intervals in maps. Further, the Spectrum-Analysis (SA), based on a Fourier spectral analysis, was also applied to generate radionuclide activity background distribution patterns. At each sampling location, the values of the main indices used to assess the health risk [2] related with low dose ionizing radiation exposure were evaluated for NOR and Cs-137, as well. Result showed that low background values of NOR are mostly featuring the south and south-east sector of the city, in correspondence with sedimentary geological formations, whereas moderately high levels of NOR characterize soils originated from weathering of andesite-basalt lavas and ignimbrite tuffs in the central and northern territory (e.g., fig.1). The spatial distribution of Cs-137 activity follows, instead, an altitude-dependent pattern probably due to the global radioactive fallout.