中文摘要：

为了解和评价运行20余年的秦山核电基地外围环境水体中^14 C的水平和分布,本文研制了水体中溶解态无机碳提取装置,并结合加速器质谱法对秦山核电基地外围环境中采集的水体样品进行了^14 C活度的测量。测量结果表明,距排放口5km内的海水样品^14 C比活度为（203.4±5.6）Bq/kg,分布范围为196.8-206.5Bq/kg,与参照点（本底）处于同一水平,未观察到显著的浓度分布规律。另外,也未观察到地表水、井水及地下水样品中^14 C浓度与参照点相比有显著增高。本次水体采样调查结果表明,核电站排放的冷却水未引起近海岸海水中^14 C浓度增高,无^14 C富集现象。

英文摘要：

In order to study the concentration and distribution of ^14 C in aquatic environ‐ment in the vicinity of Qinshan Nuclear Power Plant （NPP） after twenty years’ opera‐tion ,an apparatus extracting dissolved inorganic carbon from water was set up and applied to pretreat the water samples collected around Qinshan NPP .The ^14 C concentra‐tion was measured by accelerator mass spectrometer （AMS） .The results show that the ^14 C specific activities in surface seawater samples range from 196.8 to 206.5 Bq/kg （（203.4 ± 5.6） Bq/kg in average） ,which are close to the background .The ^14C concen‐trations in cooling water discharged from Qinshan NPP are close to the ^14 C values in near shore seawater samples out of liquid radioactive effluent discharge period .It can be further concluded that the ^14 C discharged previously is diluted and diffused well ,and no ^14C enrichment in seawater is found .Also ,no obvious increment in the 14C specific activities of surface water and underground water samples are found between Qinshan NPP region and the reference region .