Department of Physics, Radiation and Health Physics Research Laboratory, University of Ibadan, Ibadan, Nigeria.
Department of Zoology, University of Ibadan, Ibadan, Nigeria.
Mar Pollut Bull. 2023 Jul;192:114992. doi: 10.1016/j.marpolbul.2023.114992. Epub 2023 May 12.
Sediment and seafood samples were collected from Makoko Lagoon, Lagos state, Nigeria. Gamma-ray spectrometry was used to determine the activity concentrations of K, Ra and Th in the samples. The average activity concentrations of K, Ra and Th in the sediment were 41.04 ± 6.41, 10.15 ± 3.19 and 4.39 ± 2.10 Bq kg, respectively, while the annual effective dose was 0.01 mSv/year. In seafood, the average activity concentrations of K, Ra and Th were 15.66 ± 8.07, 1.72 ± 1.51 and 1.93 ± 0.30 Bq kg, respectively. The cumulative effective ingestion dose obtained ranged from 0.016 μSv/year (giant prawn) to 1.08 μSv/year (Parrotgrunt). The mean activity concentrations and absorbed dose rate in sediment were below the worldwide average values. The cumulative dose from the ingestion of seafood was also significantly low. Sediment and seafood from the lagoon in Makoko pose no health risk from a radiological point of view to the population.
从尼日利亚拉各斯州马科科泻湖采集了沉积物和海鲜样本。使用伽马能谱法测定了样品中 K、Ra 和 Th 的活度浓度。沉积物中 K、Ra 和 Th 的平均活度浓度分别为 41.04 ± 6.41、10.15 ± 3.19 和 4.39 ± 2.10 Bq kg，而年有效剂量为 0.01 mSv/年。在海鲜中，K、Ra 和 Th 的平均活度浓度分别为 15.66 ± 8.07、1.72 ± 1.51 和 1.93 ± 0.30 Bq kg。获得的累积有效摄入剂量范围为 0.016 μSv/年（大虾）至 1.08 μSv/年（鹦鹉鱼）。沉积物中的平均活度浓度和吸收剂量率低于世界平均值。从食用海鲜中摄入的累积剂量也明显较低。从辐射角度来看，马科科泻湖的沉积物和海鲜对该地区居民没有健康风险。
