Abstract: The activity concentrations of ⁹⁰Sr in environmental water in Beijing are measured and their trend in the environmental water in Beijing and relevant national level are also analyzed. The activity concentration of ⁹⁰Sr in 12 sampling points were analyzed referring to the “Method of Radiochemical Analysis of ⁹⁰Sr in Water and Ash of Biological Samples” (HJ 815—2016). The detection value of ⁹⁰Sr in environmental surface water in Beijing was (4.46±1.51) mBq/L, ranging from 1.44 to 7.56 mBq/L. Among which the river system water was (5.01±1.47) mBq/L, lake reservoir water was (4.00±1.45) mBq/L. The detection value of groundwater is (2.11±0.12) mBq/L. The ⁹⁰Sr content in Beijing's environmental water is low compared with previous years results but also within the normal fluctuation range and at an intermediate level compared with other places in China. The maximum annual intake of adults caused by ⁹⁰Sr in water is 3.66 Bq/a, and the maximum committed effective dose is 0.10 μSv/a, both of which are far less than the dose limits stipulated by national standard.

Key words: water, ⁹⁰Sr, activity concentration