Investigation on 90Sr and 137Cs activity concentrations in water in Hangzhou urban area from 2012 to 2020
10.3760/cma.j.cn112271-20230311-00070
- VernacularTitle:2012—2020年杭州市区水中 90Sr和 137Cs放射性水平调查
- Author:
Peng WANG
1
;
Yiyao CAO
;
Hong REN
;
Lei ZHOU
;
Hua ZOU
;
Shunfei YU
;
Yaoxian ZHAO
;
Zhongjun LAI
;
Zhiqiang XUAN
Author Information
1. 浙江省疾病预防控制中心，杭州 310051
- Keywords:
Hangzhou;
Water;
Radionuclide;
137Cs to 90Sr activity ratio
- From:
Chinese Journal of Radiological Medicine and Protection
2023;43(8):627-632
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To investigate the activity concentrations of 90Sr and 137Cs in water in Hangzhou urban area. Methods:From 2012 to 2020, Qiantang River water as an important drinking water source, tap water as direct drinking water for residents, and West Lake water in tourists crowded area were selected forwater quality monitoring with respect to conctnts of 90Sr and 137Cs. The activity concentrations of 90Sr and 137Cs in water samples, as collected in wet and dry seasons resepectively, were determined by radiochemical analysis, with the 137Cs to 90Sr activity ratios obtained. Results:From 2012 to 2020, the activity concentrations of 90Sr and 137Cs in tap water were (2.0±1.1) - (7.4±0.4) mBq/L and (0.45±0.06) - (7.1±0.6) mBq/L, respectively. The 137Cs to 90Sr activity ratios ranged from 0.07 to 2.40. The activity concentrations of 90Sr and 137Cs in Qiantang River were (3.7±1.1) - (17.0±4.4) mBq/L and (0.28±0.01) - (15.0±4.5) mBq/L, respectively. The 137Cs to 90Sr activity ratios ranged from 0.03 to 0.90. The activity concentrations of 90Sr and 137Cs in West Lake water were (2.2±0.5) - (11.0±2.0) mBq/L and (0.32±0.04) - (7.9±1.9) mBq/L, respectively. The 137Cs to 90Sr activity ratios ranged from 0.05 to 1.20. Conclusions:The activity concentrations of 90Sr and 137Cs in water in Hangzhou urban area were at the background levels, lower than the concentration limits, 10 Bq/L both for 90Sr and 137Cs recommended by WHO in the 4 th edition of Guidelines for Drinking Water Quality.
