【摘要】 137Cs作为广东核电站放射性排出核素之一,具有高残留,高积累的特点.悬浮物对放射性核素的吸附沉降是影响海湾水体中核素迁移的重要机制之一.为正确评价核电站放射性排出物对大亚湾海湾水域的影响,建立了考虑悬浮物吸附沉降影响的深度平均二维对流扩散模型,模拟了放射性核素137Cs在大鹏澳内的迁移分布状况,并对未来湾内水质进行预测.模拟预测表明若维持当前排放量,未来50年内海湾中137Cs活度并没有呈持续上升趋势,局部虽略有累积,但活度值仍很小,最大仅约4Bq/m3,说明悬浮物吸附137Cs沉降对海湾的自净作用不容忽视. 137更多还原

【Abstract】 As one radionuclide of the radioactive effluent from GNPS(Guangdong Nuclear Power Station), 137Cs has the characteristics of high retaining and accumulating. The adsorption sedimentation of radionuclide on suspended matter is an important mechanism affecting the radionuclide migration in the bay. In order to assess properly the effect of radioactive effluent from GNPS to Daya bay, a two-dimension depth-average advection-diffusion model considering the influence of the adsorption and sedimentation of suspended matters was developed to simulate the migration and distribution of 137Cs in Dapeng bay; the water quality of the bay in future was forecasted. The simulation forecast showed that the radioactivity of 137Cs in the following 50 years would not tend to increase when the present radioactive discharge load was maintained, except in local areas, but the value was still very low with maximum only 4Bq/m3, which indicated that the self-purification action of the bay from adsorption of 137Cs to suspended matters and sedimentation should not be neglected.更多还原