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226Ra, 210Po and lead isotopes in a pit lake water profile in Sweden.

Abstract：

:A pit lake arises as a consequence of anthropogenic activities in opencast mining areas. These water bodies may be enriched in hazardous stable contaminants and/or in naturally occurring radionuclides depending on the local geological conditions. Mining legacy in Sweden produced hundreds of these pit lakes and most of them are used for recreational purposes in the southern part of the country. In this paper, one pit lake was selected for having enhanced levels of natural radionuclides. Physico-chemical parameters (temperature, pH, oxidation-reduction potential, dissolved oxygen and depth), elemental composition (via Inductive Coupled Plasma Mass Spectrometry) and radiometric characterization (via alpha spectrometry of 226Ra, 210Po and 210Pb) were carried along the depth of a 60 m depth pit lake, with the main aim to describe how natural radionuclides and elements behaves with depth in a non-uraniferous pit lake. Based on observed changes in physico-chemical parameters, a thermocline and a chemocline region were identified at around 10 and 30 m depth respectively. Concerning radionuclides, 226Ra ranged from 75 ± 3 up to 360 ± 12 mBq/kg while 210Po ranged from 11 ± 1 up to 71 ± 3 mBq/kg. 210Pb distribution with depth was also determined via secular equilibrium with 210Po after 2 years and also stable Pb was measured. Disequilibrium 226Ra-210Pb was found and the residence time of 210Pb in the water column was assessed. Additionally, different vertical distributions between 210Pb and Pb were found which points out different sources for different lead isotopes in the water body.

journal_name

J Environ Radioact

journal_title

Journal of environmental radioactivity

authors

Thomas R,Mantero J,Pérez-Moreno SM,Ruiz-Canovas C,Vioque I,Isaksson M,Forssell-Aronsson E,Holm E,García-Tenorio R

doi

10.1016/j.jenvrad.2020.106384

subject

Has Abstract

pub_date

2020-11-01 00:00:00

pages

106384

eissn

0265-931X

issn

1879-1700

pii

S0265-931X(19)30869-0

journal_volume

223-224

pub_type

杂志文章

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