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Natural radioactivity in a former mining lake in Central Sweden

Konferensbidrag (offentliggjort, men ej förlagsutgivet)
Författare Rimon Thomas
Juan Mantero
Mats Isaksson
Christopher Rääf
Eva Forssell-Aronsson
Elis Holm
Publicerad i SweRays Workshop, Stockholm, Sweden, Aug 25-26
Publiceringsår 2016
Publicerad vid Institutionen för kliniska vetenskaper, sektionen för onkologi, radiofysik, radiologi och urologi, Avdelningen för radiofysik
Språk en
Ämneskategorier Radiofysik, Vatten i natur och samhälle, Marin ekologi

Sammanfattning

Historically Sweden (the major metal mining country in the European Union), with more than 2700 mines, gathers around 30000 sites that have been minor mines and/or quarries (according to the database of Geological Survey of Sweden, SGU). This huge activity has implied enormous quantities of generated mining wastes, considered, in some cases NORM (Naturally Ocurring Radioactive Material). In this work, one former mine lake nearby Kolsva (in Västmanland) was radiometrically characterized. Water samples from the pit lake, sediment and soil/rock samples were measured via alpha (for 238U, 234U, 232Th and 230Th isotopes) and via gamma spectrometry (for radionuclides belonging to both 238U and 232Th natural series). Also measurement of elementary composition in water (via ICP-MS) and in sediments (via XRF) was carried out. Regarding 238U isotopes, for instance, 100 to 600 mBq/kg were found in water samples. Having into account that an average value of this isotope in non-affecting environmental waters is around 20-30 mBq/kg it is quite clear that this site has enhanced U levels in superficial waters. These moderated levels in natural radionuclides were also confirmed in some rocks from this site with values above 1Bq/g in natural radionuclides from 238U series. The found activity concentration values will contribute to increase the external doses received by people visiting these sites for recreation (swimming, fishing, diving) purposes. Keywords: Natural radionuclides, environmental samples, mining lakes

Sidansvarig: Webbredaktion|Sidan uppdaterades: 2012-09-11
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