Abstract
The radioactivity of seawater nearby Daya Bay NPPs was introduced in this paper. The average annual concentrations of 90Sr and 137Cs ranged from 0.55∼2.38 and 0.81∼4.68 Bq·m-3 respectively during 1993∼2015. The average annual concentration range of 3H is 0.8∼7 Bq·L-1. The concentration range of 14C is 7.6—8.6 Bq·m-3, and the concentration of 3H and 14C is higher than that of the reference location or the background, but with no cumulative effect. The concentrations of 90Sr and 137Cs in seawater have no obvious relationship with the nuclear liquid effluent discharging. The average concentrations of 238U and 232Th were 24.6±10.6 and 18.1±7.5 Bq·m-3 respectively during 2000∼2008.
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