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Environmental Earth Sciences

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01.11.2021 | Thematic Issue

Thoron and radon exhalation and emanation from granitic rocks outcropping in the Central Iberian Zone (Portugal)

verfasst von: Filipa P. Domingos, Sérgio L. R. Sêco, Alcides J. S. C. Pereira

Erschienen in: Environmental Earth Sciences | Ausgabe 22/2021

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Abstract

Terrestrial radionuclides present in soil, bedrock and building materials are considered the main source of indoor radon (²²²Rn) and thoron (²²⁰Rn). Due to its shorter half-life, ²²⁰Rn is often neglected, however, its contribution to the dose received by the population may be significant. Therefore, improving existing knowledge on ²²⁰Rn exhalation from bedrock is crucial for an accurate assessment of the risk of exposure to ionizing radiation. In the present work ²²²Rn and ²²⁰Rn exhaled per unit mass (EX) and emanation coefficient (EM) were measured simultaneously in granitic rock samples collected in the Central Iberian Zone. The relationship between the ²²²Rn and ²²⁰Rn EX, EM, the activity concentrations of ²²⁶Ra and ²²⁴Ra, and bulk density are investigated. ²²⁶Ra and ²²⁴Ra activity concentration are generally similar between the samples, except in syn-to late-tectonic two mica granites (B2) and porphyritic granodiorites (C1). On average, ²²²Rn EX and EM are higher than ²²⁰Rn EX and EM, despite a similar range. Heterogeneities in ²²⁶Ra and ²²⁴Ra activity, and ²²²Rn EX and EM are observed linked to the time of emplacement of granitic intrusions relative to the third deformation phase of the Variscan orogeny. ²²⁰Rn EX is homogeneous among different granite types and may exceed ²²²Rn EX in C1 granites due to a higher activity concentration of ²²⁴Ra. No correlation is observed between ²²⁶Ra and ²²⁴Ra, hindering the correlation between ²²² and ²²⁰Rn data, which implies that ²²⁰Rn must be estimated directly for a proper assessment of ²²⁰Rn contribution to the dose received by the population. Bulk density is also different according to granite type, being higher in granites from the C group (granodiorites and biotite), and lower in granites from groups A (pre-Variscan and earlier Variscan granitoids) and B (S-type leucogranites and two mica granites). These differences are closely linked to the distinct geochemical composition and mineralogy of the granitic rocks.

Vorheriger Artikel Occurrence and distribution of nutrients and trace metals in groundwater in an intensively irrigated region, Luvuvhu catchment, South Africa

Nächster Artikel Processes and evolution of the Pleistocene coastal sedimentary succession of Es Codolar (Southern Eivissa, Balearic Islands, Western Mediterranean): insights from soft-sediment deformation structures

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Titel: Thoron and radon exhalation and emanation from granitic rocks outcropping in the Central Iberian Zone (Portugal)
verfasst von: Filipa P. Domingos
Sérgio L. R. Sêco
Alcides J. S. C. Pereira
Publikationsdatum: 01.11.2021
Verlag: Springer Berlin Heidelberg
Erschienen in: Environmental Earth Sciences / Ausgabe 22/2021
Print ISSN: 1866-6280
Elektronische ISSN: 1866-6299
DOI: https://doi.org/10.1007/s12665-021-10008-x

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Weitere Artikel der Ausgabe 22/2021

Seasonal variability, index modeling and spatiotemporal profiling of groundwater usability in semi-urban region of western Uttar Pradesh, India

Risk assessment of selected cephalosporins in surface waters: predictions for North Cyprus

Applying optimized relevance vector regression approach for indirect forecasting rock mass deformation modulus

Appraisal of groundwater contamination and spatial variation using geostatistical modeling in Surguja district of Chhattisgarh, India

Quantitative assessment of regional land use and climate change impact on runoff across Gilgit watershed

Mechanical characteristics of red sandstone under cyclic wetting and drying