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Spatial correlation between radon (222Rn) in groundwater and bedrock uranium (238U): GIS and geostatistical analyses
Linköping University, Department of Medicine and Health Sciences, Radiation Physics . Linköping University, Faculty of Health Sciences.
Linköping University, Department of Medicine and Health Sciences, Radiation Physics . Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Centre of Surgery and Oncology, Department of Radiation Physics.
Linköping University, Department of Computer and Information Science, GIS - Geographical Information Science Group. Linköping University, The Institute of Technology.
Linköping University, Department of Medicine and Health Sciences, Radiation Physics . Linköping University, Faculty of Health Sciences.
2002 (English)In: Journal of Spatial Hydrology, ISSN 1530-4736, Vol. 2, no 2, 1-10 p.Article in journal (Refereed) Published
Abstract [en]

This study describes approaches to create surface maps of radon in groundwater based on measurements of radon (222Rn) in drilled bedrock wells at unevenly distributed sites and uranium bedrock maps from the South East of Sweden, the Östergotland county (N 58°14’ – N 58°56’and E 14°53’ – E 16°06’), see figure 1. Geostatistical techniques of inverse distance weighted(IDW), kriging and cokriging were compared in terms of their interpolation power and correlation between the produced radon in the water layer and the bedrock uranium layer. The goal of these analyses and calculations is to improve our understanding concerning the factors influencing the transport of radon. Therefore, these interpolation techniques were investigated by optimizing parameters that are used in the specific interpolation. Using the IDW interpolator method at fixed radius enabled us to determine the linkage or search distances for auto correlation, and linkage between radon in water and bedrock. This method showed good agreement with the cokriging method when using uranium concentration as a secondary variable. Good interpolation layers (with least root mean square errors RMSE=232) were obtained by kriging. However, the kriged radon surface showed poor correlation with bedrock uranium layers. The best radon in waterlayer that match with uranium in bedrock layer was produced using IDW interpolator (RMSE=377, using all points). The correlation coefficient (R2) is 0.5 while for the kriging method the best correlation is R2 = 0.1. A compromise between the two approaches is demonstrated.

Place, publisher, year, edition, pages
2002. Vol. 2, no 2, 1-10 p.
Keyword [en]
radon, uranium, groundwater, bedrock, GIS, Kriging, IDW
National Category
Radiology, Nuclear Medicine and Medical Imaging
Identifiers
URN: urn:nbn:se:liu:diva-13702OAI: oai:DiVA.org:liu-13702DiVA: diva2:21181
Available from: 2003-12-18 Created: 2003-12-18 Last updated: 2009-08-20
In thesis
1. Radon in natural waters: Analytical Methods; Correlation to Environmental Parameters; Radiation Dose Estimation; and GIS Applications
Open this publication in new window or tab >>Radon in natural waters: Analytical Methods; Correlation to Environmental Parameters; Radiation Dose Estimation; and GIS Applications
2003 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Investigations of radon in natural water and its relation to physical and chemical parameters are outlined in this thesis. In particular, a method for measuring 222Rn in water at low concentrations (~20 mBq.l-1) is described, followed by discussions concerning the design and its application to study both radon and parameters influencing radon levels in natural waters. A topic considered is the impact of fluoride and other aquatic parameters on radon in water. Moreover, variables such as uranium series radionuclides and stable elements in water, bedrock and sediment radioactivity and geology are investigated in two case studies. This was performed by employing radiometric-, chemical-, statistical- and GIS & geostatistical- analyses. The general water chemistry and presence of some elements such as fluoride was observed to influence radon levels in water. Health aspects of radon in drinking water are discussed based on radiation dose assessments. The radiation doses are compared with and added to doses incurred from ingestion of uranium, radium and polonium isotopes in drinking water and inhalation of radon in air in order to estimate total exposures for different age categories. The results may have a potential for future epidemiological studies.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2003. 46 p.
Series
Linköping University Medical Dissertations, ISSN 0345-0082 ; 820
Keyword
Radon analysis, radiation effects, Water chemistry, Water pollution, radioactive analysis
National Category
Radiology, Nuclear Medicine and Medical Imaging
Identifiers
urn:nbn:se:liu:diva-5221 (URN)91-7373-510-8 (ISBN)
Public defence
2003-11-07, Elsa Brändströmsalen, Campus US, Linköpings universitet, Linköping, 13:15 (English)
Opponent
Supervisors
Available from: 2003-12-18 Created: 2003-12-18 Last updated: 2012-01-25Bibliographically approved

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Salih, IsamPettersson, HåkanSivertun, ÅkeLund, Eva

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Radiation Physics Faculty of Health SciencesDepartment of Radiation PhysicsGIS - Geographical Information Science GroupThe Institute of Technology
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