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Atmospheric Deposition of Airborne Radionuclides in Croatia studied by the Moss Biomonitoring Technique - preliminary results

Within the UNECE ICP Vegetation survey in 2010 the 15 moss samples out of 160 ones collected over the entire Croatia (Figure) were subjected to radiometry for assessing activity of the naturally occurring radionuclides 40K, 232Th, 226Ra, and 238U, as well as the technogenic 137Cs. The activities of 40K, 232Th, 137Cs, 226Ra, and 238U were determined using a low background HP Ge spectrometer (CANBERRA). For calibration gamma mixed standards supplied by Eckert & Ziegler (Analytics USA) were used. Efficiency of the system was regularly checked during intercomparison runs. Precision and accuracy of the system were checked additionally by simultaneous measurement of IAEA Reference Material. Preliminary results on the selected samples from CRO 2010 moss survey (Table) may, besides the standard monitoring of radioactivity, serve as a baseline – "background pollution levels" – related to the possible effects from the Fukushima (Japan) nuclear disaster in 2011.

biomonitoring; moss; radionuclides

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