title: Environmental assessment of risks associated with the Ordovician Dictyonema shale in the eastern part of the Baltic Klint
metadata.name: dc.contributor.author
metadata.value: Lebedev, Sergej V.
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Dubrova, Stanislav V.
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Fedorov, Petr V.
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Kurilenko, Vitalij V.
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Siabato, Willington
metadata.lang: -
metadata.name: dc.date.accessioned
metadata.value: 2018-07-12T20:29:37Z
metadata.lang: -
metadata.name: dc.date.available
metadata.value: 2018-07-12T20:29:37Z
metadata.lang: -
metadata.name: dc.date.issued
metadata.value: 2018-06
metadata.lang: -
metadata.name: dc.identifier.citation
metadata.value: Lebedev S. V., Dubrova S. V., Fedorov P. V., Kurilenko V. V., Siabato W. Environmental assessment of risks associated with the Ordovician Dictyonema shale in the eastern part of the Baltic Klint. Vestnik of Saint Petersburg University. Earth Sciences, 2018, vol. 63, issue 2, pp. 147–159.
metadata.lang: en_GB
metadata.name: dc.identifier.other
metadata.value: 10.21638/11701/spbu07.2018.202
metadata.lang: -
metadata.name: dc.identifier.uri
metadata.value: http://hdl.handle.net/11701/10421
metadata.lang: -
metadata.name: dc.description.abstract
metadata.value: The results of research considered in this article made it possible to expand the understanding of
  the environmental risks associated with the highly radioactive bituminous argillites of the Baltic
  Sea region. The natural patterns of the distribution of natural radionuclides 226Ra, 232Th and 40K
  are established along the strike and thickness of layers. The average value of the effective specific
  activity (ESA) for all samples in the Koporka River valley amounted 1270 Bq/kg. The minimum
  value of ESA was 650 Bq/kg (the closest to the seam roof level), and the maximum value was
  3750 Bq/kg (the second from the seam floor level). Conversion to mass fractions of natural
  radionuclides (NRN) showed that the average content of uranium in the sample amounted up
  to 90.7 g/t, thorium up to 11.4 g/t and of potassium up to 4.1 %. The high heterogeneity of the
  content distribution of NRN along the strike of the Dictyonema shale seam was confirmed by
  studies of separate outcrops of highly radioactive rocks along the banks of the Tosna River. In
  general, the level of the argillites radioactivity has abnormally high value and exceeds the natural
  background more than ten times. The average annual values of the effective dose amounted from
  5,8 to 10,7 mSv/year, that should be classified as the territories of emergency ecological danger
  and zones of ecological disaster.
metadata.lang: en_GB
metadata.name: dc.language.iso
metadata.value: en
metadata.lang: en_GB
metadata.name: dc.publisher
metadata.value: St Petersburg State University
metadata.lang: en_GB
metadata.name: dc.relation.ispartofseries
metadata.value: Vestnik of St Petersburg University. Earth Sciences;Volume 63; Issue 2
metadata.lang: -
metadata.name: dc.subject
metadata.value: Dictyonema shale
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: natural radionuclides
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: specific activity
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: potential radiation exposure
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: environmental risks
metadata.lang: en_GB
metadata.name: dc.title
metadata.value: Environmental assessment of risks associated with the Ordovician Dictyonema shale in the eastern part of the Baltic Klint
metadata.lang: en_GB
metadata.name: dc.type
metadata.value: Article
metadata.lang: en_GB
resources.filename: 02-Lebedev.pdf
resources.url: https://dspace.spbu.ru/bitstream/11701/10421/1/02-Lebedev.pdf
resources.format: Adobe PDF
resources.size: 1,59 MB