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Marine sediment samples were collected from Ierissos Gulf, N Aegean Sea, close to the coastal mining facilities. Measurements of radionuclide and metal concentrations, mineral composition and grain size distribution were performed. The concentrations of 226 Ra, 235 U and trace metals showed enhanced values in the port of Stratoni compared with those obtained near to Ierissos port. The dose rates received by marine biota were also calculated by the ERICA Assessment Tool and the results indicated no significant radiological risk. [ABSTRACT FROM AUTHOR]

Activity concentration measurements were carried out on the seabed, by implementing the underwater detection system KATERINA. The efficiency calibration was performed in the energy range 350–2600 keV, using in situ and laboratory measurements. The efficiency results were reproduced and extended in a broadened range of energies from 150 to 2600 keV, by Monte Carlo simulations, using the MCNP5 code. The concentrations of 40 K, 214 Bi and 208 Tl were determined utilizing the present approach. The results were validated by laboratory measurements. [ABSTRACT FROM AUTHOR]

Abstract: Sediment samples have been collected in the Butrint area, located in the south-west Albania to determine the radioactivity levels of 40K, 137Cs, 212Bi, 212Pb, 214Bi, 214Pb, 226Ra and 228Ac on the bed of the lagoon and adjacent sea, using direct counting gamma spectroscopy. The concentration of 137Cs and 40K varied from 2.8 to 37.5Bq/kg and from 266 to 675Bq/kg dry weight (dw), respectively (central values). The average concentrations of 238U and 232Th daughter products varied from 8 to 27Bq/kg and from 13 to 40Bq/kgdw, respectively. The measured 235U activity ranged from 0.7 to 2.5Bq/kgdw. Samples of different sedimentary properties, studied for the radioactivity concentration, revealed an inversely proportional relation between grain size and a linear combination of measured specific activities of 226Ra, 232Th (228Ac, 212Bi and 212Pb), 40K and 137Cs. [Copyright &y& Elsevier]