长江口表层沉积物天然放射性评价。
Natural radioactivity assessment of surface sediments in the Yangtze Estuary.
机构信息
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, PR China.
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, PR China.
出版信息
Mar Pollut Bull. 2017 Jan 15;114(1):602-608. doi: 10.1016/j.marpolbul.2016.09.040. Epub 2016 Sep 21.
The activities of the natural radionuclides (U, Th, Ra and K) of the surface sediments in the Yangtze Estuary were determined and used to evaluate radiation hazards in the study area. The of activities of U, Th, Ra and K ranges from 14.1 to 62.3, 26.1 to 71.9, 13.7 to 52.3, and 392 to 898Bqkg, respectively, which were comparable to values of other regions in China. The activities of Th, K and Ra were clearly different from the global recommended values. The radium equivalent activity was less than the recommended limit of 370Bqkg; therefore, the sediment in this area can be safely used for reclamation. The external hazard index values were less than one. The average absorbed gamma dose rate and annual effective dose equivalent values were slightly greater than the world average value. Ra/U and Th/U ratios could potentially be applied for tracing sediment source.
测定了长江口表层沉积物中天然放射性核素（U、Th、Ra 和 K）的活度，并用其评估研究区域的辐射危害。U、Th、Ra 和 K 的活度范围分别为 14.1 至 62.3、26.1 至 71.9、13.7 至 52.3 和 392 至 898Bqkg，与中国其他地区的值相当。Th、K 和 Ra 的活度明显不同于全球推荐值。镭当量活度低于 370Bqkg 的推荐限值；因此，该区域的沉积物可安全用于填海造地。外照射指数值小于 1。平均吸收 γ 剂量率和年有效剂量当量值略高于世界平均值。Ra/U 和 Th/U 比值可用于示踪沉积物来源。
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