ABSTRACT
Objective To investigate the distribution of gross α and gross β levels of centralized drinking-water of township in Beijing from 2018 to 2019, so as to carry out better monitoring and evaluating the radioactivity in water. Methods A total of 215 underground drinking water samples were collected from 12 districts of Beijing, then monitored and evaluated according to the Determination of gross alpha activity in water-thick source method EJ/T 1075—1998 and Determination of gross beta activity in water-evaporation method EJ/T 900—1994. Results The gross α level of centralized drinking water of township in Beijing was 0.050 (0.052) Bq/L, ranging from 0.001 to 0.210 Bq/L, and the gross β level was 0.048 (0.038) Bq/L, ranging from 0.002 to 0.261 Bq/L from 2018 to 2019. Gross α and gross β levels of all samples did not exceed the guidance value recommended by standards for drinking water quality. There was no significant difference in the distribution of gross α and gross β levels of samples of all districts from 2018 to 2019(P > 0.05), there were significant differences in the distribution of gross α and gross β levels of samples from different district in the same period (P < 0.05). And the levels of Miyun, Huairou and Shunyi in Chaobai River system were higher than other districts. Conclusion The distribution of radioactive background of centralized drinking-water of township in Beijing was mastered, which was in the normal range.
ABSTRACT
Objective To investigate the effect on radioactivity in drinking water around Qinshan nuclear power station (QNPS)in normal operational condition.Methods The field monitoring and laboratory analysis methods were adopted to detect the total radioactivity level in drinking water in 2015,according to different distances from the nuclear island and different types of water.Results The total alpha and total beta radioactivity level in drinking water around QNPS were 0.027(0.098)Bq /L and 0.263(0.071)Bq /L respectively,which were obviously lower than the national health standard limits(total alpha and total beta are 0.5,1.0 Bq /L respectively).Total radioactivity level had no relation with the distance from the nuclear island (P >0.05).The total alpha radioactivity in deep well water was the highest among the investigated three types of drinking water,and the highest value was 0.224 Bq /L.The beta radioactivity level in river water was the highest,and the highest value was 0.408 Bq /L.The total alpha radioactivity level was 0.017 (0.013)Bq /L in 2015, higher than the average level during 2010—2014.The beta radioactivity average level was 0.319 (0.102)and 0.289 (0.055)Bq /L,also higher than the average level during 2010—2014.Conclusion The total radioactivity in drinking water among nuclear power plant is in normal background level,so at present there is no effect of the radioactive contamination on drinking water around QNPS in nuclear power plant's normal operational condition.