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Determination of 222Rn and 226Ra in water using a large volume ionisation chamber
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 Medicine and Health Sciences, Radiation Physics . Linköping University, Faculty of Health Sciences.
2000 (English)In: Journal of Environmental Radioactivity, ISSN 0265-931X, Vol. 48, no 2, 235-245 p.Article in journal (Refereed) Published
Abstract [en]

A new method for measuring 222Rn and 226Ra in water has been devised. It is based on exhaling radon to a void volume by continuous bubbling of air through the water. The exhaled radon is then transferred in a closed circuit to a modified radon gas pulse ionisation chamber for alpha-spectrometric measurements. About 86% of the radon in water is transferred from 0.75 l of water to the void volume (3.2 l). The set-up offers direct and specific 222Rn measurements for a wide range of concentrations and shows a low detection limit (LLD=45 mBq l−1 for 8 h counting time). Radium in water is measured, via radon, after sample storage for a month. The method was compared with gamma ray spectrometry for radon and for radium, the latter after pre-concentration by co-precipitation with MnO2 from 10 l water samples. An excellent agreement between the two techniques was obtained. As a part of a radon survey, the method was employed for analysis of drinking water from bedrock wells.

Place, publisher, year, edition, pages
2000. Vol. 48, no 2, 235-245 p.
Keyword [en]
Radon, Radium, Drinking water, Ground water, Measurement, Ionisation chamber
National Category
Radiology, Nuclear Medicine and Medical Imaging
Identifiers
URN: urn:nbn:se:liu:diva-13698DOI: 10.1016/S0265-931X(99)00062-4OAI: oai:DiVA.org:liu-13698DiVA: diva2:21177
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, HåkanLund, Eva

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