Radioactivity in Drinking Water of Bangladesh

概要

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The activity concentration levels of ^<232>Th, ^<238>U, ^<40>K and ^<137>Cs in drinking water of different locations of Bangladesh were measured by using a high purity germanium (HPGe) detector. The average activity levels with one standard deviation (1σ) of ^<232>Th, ^<238>U and ^<40>K were found to be 250±52mBq/L^<-1>, 157±30mBq/L^<-1> and 9±3Bq/L^<-1>, respectively. The ^<137>Cs was detected only in 32% samples with an average 4±0.8Bq/L^<-1>. A good correlation between the activities of ^<232>Th and ^<238>U was found. The radium equivalent activity (Ra_<eq>) and the representative level index (I_<γr>) due to natural radionuclides were also calculated. The average Ra_<eq> was found to be 1,212±303mBq/L^<-1> and the average I_<γr> was found to be 10±3mBq/L^<-1>. The annual individual committed effective dose (H_E) due to intake of radionuclides in water was also evaluated and the average value was found to be 74±21μSv. The distribution of radionuclides was found to be normal except ^<137>Cs. The radioactivity levels of these radionuclides were comparable to the corresponding reported values of drinking water of different countries. The results presented in this study may helpful in establishing a regulatory limit on radioactivity in drinking water in Bangladesh.
日本保健物理学会の論文