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Radiation Protection Dosimetry Advance Access originally published online on January 18, 2005
Radiation Protection Dosimetry 2005 113(2):223-232; doi:10.1093/rpd/nch446
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org

Scientific Note

Natural radioactivity in drinking water in private wells in Finland

P. Vesterbacka*, I. Mäkeläinen and H. Arvela

STUK, Radiation and Nuclear Safety Authority, P.O. Box. 14, 00881 Helsinki, Finland

* Corresponding author: pia.vesterbacka{at}stuk.fi

Received October 1, 2004, amended November 12, 2004, accepted December 5, 2004

Natural radioactivity in drinking water was determined in population-based random study of 472 private wells. The mean concentrations of 222Rn, 226Ra, 234U, 238U, 210Pb and 210Po in drilled wells were 460, 0.05, 0.35, 0.26, 0.04 and 0.05 Bq l–1, and in wells dug in the soil were 50, 0.016, 0.02, 0.015, 0.013 and 0.007 Bq l–1, respectively. Approximately 10% of the drilled wells exceeded a radon concentration of 1000 Bq l–1 and 18% a uranium concentration of 15 µg l–1. The mean annual effective dose from natural radionuclides for a drilled well user was 0.4 mSv and 0.05 mSv for a user of a well dug in the soil. The effective dose arising from 222Rn was 75% of the total of all natural radionuclides for drilled well users. As regards long-lived radionuclides, 210Po and 210Pb caused the largest portion of the effective dose. The dose arising from 238U, 234U and 226Ra was only 8% of the total of all natural radionuclides.


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