~(222)Rn and~(226)Ra concentrations in selected shallow circulation groundwaters from the Fore-Sudetic Monocline area

摘要

Natural radioactive isotopes occur in vari-ous components of the natural environment,includ-ing groundwater.The general population,not always aware of possible threats,can use its resources.The activity concentration of some of the radioactive iso-topes should be monitored,especially in those intakes from which it is possible to obtain water for human consumption,e.g.in domestic wells.The conducted research was innovative due to the fact that in many countries,including Poland,there are no regula-tions on waters exploited from home wells using as a drinking water source.As the groundwaters from this area have not been examined for radon(~(222)Rn)and radium(~(226)Ra)occurrence yet,the goal of this research was to perform screening tests in this part of the Fore-Sudetic Monocline.For this purpose,the authors have measured the concentration of 222Rn and~(226)Ra activity in groundwater collected from this geological unit located in south-western Poland.~(222)Rn and~(226)Ra occurrence was researched,and spe-cific electrolytic conductivity,redox potential,pH and temperature were measured in 52 groundwater sam-ples.~(222)Rn activity concentration ranged from 0.18 to 19.78 Bq/dm~3.Only in three cases,~(226)Ra activity con-centration reached a value above the lower detectionlimit of the applied method,i.e.0.05 Bq/dm3(max.0.77 Bq/dm~3).The authors present completely new data on the occurrence of these radioactive isotopes in the waters of the first aquifer in the Fore-Sudetic Monocline,which is not without significance for the health of consumers of these waters.