title: Simulation of the shielding properties of environmental components against external radioactive radiation from the Ordovician Dictyonema shale
metadata.name: dc.contributor.author
metadata.value: Lebedev, Sergey 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: Siabato, Willington
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Kurilenko, V. V.
metadata.lang: -
metadata.name: dc.date.accessioned
metadata.value: 2020-05-28T20:26:01Z
metadata.lang: -
metadata.name: dc.date.available
metadata.value: 2020-05-28T20:26:01Z
metadata.lang: -
metadata.name: dc.date.issued
metadata.value: 2020-03
metadata.lang: -
metadata.name: dc.identifier.citation
metadata.value: Lebedev, S. V., Dubrova, S. V., Fedorov, P. V., Siabato W., Kurilenko, V. V. (2020). Simulation of the shielding properties of environmental components against external radioactive radiation from the Ordovician Dictyonema shale. Vestnik of Saint Petersburg University. Earth Sciences, 65 (1), 4–15.
metadata.lang: en_GB
metadata.name: dc.identifier.other
metadata.value: https://doi.org/10.21638/spbu07.2020.101
metadata.lang: -
metadata.name: dc.identifier.uri
metadata.value: http://hdl.handle.net/11701/17960
metadata.lang: -
metadata.name: dc.description.abstract
metadata.value: This paper presents the results of simulating the conditions of absorption of natural radionuclides
  (uranium-238, thorium-232, potassium-40) in different environment media (water and
  quartz sand) to assess the effect of the shielding properties of environmental components on
  the intensity of external radiation exposure to the benthic biota. The source of radiation was
  the lower Tremadocian Dictyonema shale, which formed the bottom of the Baltic Paleobasin.
  Water and quartz sand, which was gradually deposited on the roof of the Dictyonema shale,
  were used in the simulation as media (materials) absorbing the primary radiation. The manuscript
  shows an experiment conducted in full-scale conditions considering a single exposure
  of a section of Ordovician rocks that includes highly radioactive Dictyonema shale. This is
  a small area, but the simulation results are also valid for larger areas as the Baltic Paleobasin.
  During the late Tremadocian — Floian, along with transgression, benthic biota began to
  emerge. The experiment shows quantitatively what dosage this biota could have experienced
  over tens and hundreds of thousands of years, until the Dictyonema shale was covered with a
  sufficiently thick layer of water-flooded sediments. Experimental data show that the presence
  of a 10 cm thick layer of water reaches absorption of 40 % of the integral flux of all gamma lines
  of natural radionuclides (NRN), and in a moist quartz sand layer of the same thickness the
  absorption value does not exceed 50 %. Thus, despite the screening effect of the environment,
  the benthic biota of Baltoscandia in the Early Ordovician could have been under significant
  radiation exposure for millennia. The main value of the experiment is that it was performed in
  situ, and exclusively natural media were used as modelling elements.
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 65; Issue 1
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: gamma radiation
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: absorption coefficient
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: radiation shielding properties
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: benthic biota
metadata.lang: en_GB
metadata.name: dc.title
metadata.value: Simulation of the shielding properties of environmental components against external radioactive radiation from the Ordovician Dictyonema shale
metadata.lang: en_GB
metadata.name: dc.type
metadata.value: Article
metadata.lang: en_GB
resources.filename: 4-15.pdf
resources.url: https://dspace.spbu.ru/bitstream/11701/17960/1/4-15.pdf
resources.format: Adobe PDF
resources.size: 2,6 MB