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Radiation Protection Dosimetry Advance Access originally published online on April 24, 2008
Radiation Protection Dosimetry 2008 130(3):392-396; doi:10.1093/rpd/ncn156
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© The Author 2008. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Exposures to 222Rn from consumption of underground municipal water supplies in Pakistan

F. Manzoor1, A. S. Alaamer2 and S. N. A. Tahir3,*

1 Faculty of Science, Lahore College for Women University, Lahore, Pakistan
2 Physics Division, Science Department, KKMA, PO Box 22140, Riyadh, Saudi Arabia
3 Directorate General of Local Government and Community Development Department, Punjab, Lahore, Pakistan

* Corresponding author: snatahir{at}cyber.net.pk

Received January 1, 2008, amended March 29, 2008, accepted April 1, 2008

This paper presents the results of radon (222Rn) concentration measurements in municipal supply drinking water in metropolitan Lahore city of Pakistan and evaluation of consequent radiological effects. In this respect, water samples were collected in all nine municipal towns of Lahore city and analysed employing a high-resolution gamma spectrometric system. Radon concentration varied from 2.0 ± 0.3 to 7.9 ± 2.1 Bq l–1. Mean value of annual effective dose for an individual consumer was assessed to be 16.5 ± 12.8 µSv y–1. 222Rn mean concentration measured in this study is comparable with the reported values for drinking water determined worldwide and found to be less than the limit of 100 Bq l–1 recommended by the World Health Organisation for public water supplies. The results of this study may be helpful in establishing background levels of radon in drinking water that could be used not only to distinguish additional contributions when a contamination event occurs but also to implement water quality standards by the concerned authorities to maintain radioactive contamination free drinking water supplies for the population.


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