Radiation Protection Dosimetry Advance Access originally published online on June 15, 2006
Radiation Protection Dosimetry 2006 121(4):406-412; doi:10.1093/rpd/ncl067
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Activity concentrations of 226Ra and 228Ra in drilled well water in Finland
STUKRadiation and Nuclear Safety Authority, P.O.Box 14, 00881 Helsinki, Finland
* Corresponding author: pia.vesterbacka{at}stuk.fi
Received March 10, 2006, amended April 24, 2006, accepted May 7, 2006
| Abstract |
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The activity concentrations of 226Ra and 228Ra in drinking water were determined in water samples from 176 drilled wells. 226Ra activity concentrations were in the range of <0.011.0 Bq l1 and 228Ra activity concentrations in the range of <0.030.3 Bq l1. The mean activity concentration of 226Ra and 228Ra were 0.041 and 0.034 Bq l1, respectively. High radium activity concentrations in drinking water were rare. Only 24% of the drilled wells exceeded a 226Ra concentration of 0.5 Bq l1 and 12% of the wells exceeded a 228Ra concentration of 0.2 Bq l1. These are the activity concentrations that cause a 0.1 mSv annual effective dose for users of drinking water. The maximum annual effective doses from 226Ra and 228Ra for users of drilled wells were 0.21 mSv, and 0.16 mSv respectively. The elevated activity concentrations of 226Ra and 228Ra did not occur simultaneously in the same groundwaters and the correlation between 226Ra and 228Ra was small.