http___fulir.irb.hr_2846_.xml
http___fulir.irb.hr_2851__1.xml
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Rožmarić Mačefat, Martina; Rogić, Matea; Benedik, Ljudmila; Štrok, Marko; Barišić, Delko (2013) Seasonal and spatial variations of 210Po and 210Pb activity concentrations in Mytilus galloprovincialis from Croatian coast of the Adriatic Sea. Chemosphere, 93 (9). Abstract Results of 2 years monitoring of 210Po and 210Pb activity concentrations in soft tissue of the species Mytilus galloprovincialis from Croatian part of the Adriatic coast are presented. The samples were collected at thirteen coastal stations (some of which are also a part of the Mediterranean Mussel Watch Project) in spring and autumn of 2010 and 2011. The collected mussels were ranging between 4 cm and 6 cmin shell length. After sample pre-treatment lead and polonium were radiochemically separated on Sr resin. 210Po was determined by alpha-particle spectrometry and 210Pb was determined, via 210Bi, by a low-level gas proportional counter. The results of 210Po activity concentrations were found to vary between (104 ± 11)and (1421 ± 81) Bq kg1 dry weight while 210Pb activity concentrations were much lower and in range (8.2 ± 5.3)–(94.1 ± 29.8) Bq kg1 dry weight. Higher 210Po and 210Pb activity concentrations were determined in spring period. The inter-site differences seen in their activity concentrations can be due to natural background levels of sites. The 210Po/210Pb activity concentration ratios in all cases exceeded unity for all mussel samples and ranged between 4.0 and 47.9
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Rogić, Matea; Rožmarić Mačefat, Martina; Barišić, Delko; Benedik, Ljudmila; Planinšek, Petra (2013) Activity concentrations of 210Po and 210Pb in mussels (Mytilus galloprovincialis) with total annual effective dose assessment to the coastal population of the Republic of Croatia. In: Knežević, Željka; Majer, Marija; Krajcar Bronić, Ines, (eds.) Zbornik radova Devetog simpozija Hrvatskog društva za zaštitu od zračenja. Zagreb, Hrvatsko društvo za zaštitu od zračenja, pp. 229-234 . Abstract 210Po i 210Pb članovi su prirodnog radioaktivnog niza 238U te su zbog svojih nuklearnih svojstava vrlo radiotoksični. Dagnje (Mytilus galloprovincialis) filtriranjem mora akumuliraju 210Po i 210Pb pri čemu je akumulacija 210Po značajnija u odnosu na 210Pb zbog visokog afiniteta vezanja na organsku tvar. Konzumacija dagnji u svakodnevnoj prehrani stoga može utjecati na povišenu izloženost stanovništva zračenju. U radu su prikazani rezultati određivanja koncentracija aktivnosti 210Po i 210Pb u dagnjama uzorkovanim 2011.g. te procijenjena godišnja efektivna doza koju odraslo stanovništvo priobalja primi njihovom konzumacijom. 210Po je nakon odjeljivanja od olova na Sr smoli i samodepozicije određivan alfa spektrometrijom, dok je 210Pb taloženo kao PbSO4 te određivano brojanjem na plinskom proporcionalnom brojaču (nakon uspostave radioaktivne ravnoteže s 210Bi). Koncentracije aktivnosti 210Po u rasponu su od (26, 2 ± 2, 8) Bq kg–1 do (236, 1 ± 19, 4) Bq kg–1 svježe mase dok su aktivnosti 210Pb znatno niže i u rasponu od (2, 1 ± 1, 2) Bq kg–1 do (15, 4 ± 4, 9) Bq kg–1. Najviše aktivnosti izmjerene su u dagnjama koje se uzgajaju u neretvanskom kanalu. Omjeri aktivnosti 210Po/210Pb kreću se od 4, 0 do 36, 6. Ukupna godišnja efektivna doza za priobalno stanovništvo prosječno iznosi 254, 6 uSv s 95 % udjelom 210Po u ukupnoj dozi.