Guan Yongjing, Jing Qiaoyan, Wang Shenzhen, Wang Huijuan, Chen Wu, Hua Yuxin, Guo Zichen, Cui Liangjia, Huang Chunping, Wang Liang, Kuang Pan, He Xianwen, Liu Zhiyong
Guangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science and Technology, Guangxi University, Nanning, 530004, China.
Guangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science and Technology, Guangxi University, Nanning, 530004, China; State Key Laboratory of Radiation Medicine and Protection, School for Radiological and Interdisciplinary Sciences (RAD-X), Collaborative Innovation Centre of Radiation Medicine of Jiangsu Higher Education Institutions, Soochow University, Suzhou, 215123, China.
J Environ Radioact. 2023 May;261:107145. doi: 10.1016/j.jenvrad.2023.107145. Epub 2023 Mar 2.
Radionuclides in environmental ecosystems have ecotoxicity and health impact on human and environment, so radioactive contamination has always been one of the global concerns. This study mainly focused on the radioactivity of mosses collected from the Leye Tiankeng Group in Guangxi. The activities of Pu measured by SF-ICP-MS and Cs measured by HPGe in moss and soil samples are as follows: 0-2.29 Bq/kg in mosses and 1.5-11.9 Bq/kg in soils for Cs, and 0.025-0.25Bq/kg in mosses and 0.07-0.51Bq/kg in soils for Pu. The range of Pu/Pu atom ratios (0.201 in mosses and 0.184 in soils) and Pu/Cs activity ratios (0.128 in mosses and 0.044 in soils) indicated that the Cs and Pu in study area were mainly contributed by global fallout. Cs and Pu showed similar distribution in soils. However, their behaviors in mosses were quite different due to the differences in the growth environment of mosses. The transfer factors of Cs and Pu from soil to moss varied in different growth stages and specific environments. A weak positive correlation among Cs, Pu in mosses and soil-derived radionuclides suggested that resettlement was predominant here. The negative correlation between Be, Pb and soil-derived radionuclides indicated that Be and Pb came from atmospheric components, while the weak correlation between them suggested that their specific sources were different. The Cu and Ni were moderately enriched in mosses here due to the use of agricultural fertilizers, At the same time, Zn was at a high level in the Lilang area, where transportation was more developed.
环境生态系统中的放射性核素对人类和环境具有生态毒性和健康影响，因此放射性污染一直是全球关注的问题之一。本研究主要聚焦于从广西乐业天坑群采集的苔藓的放射性。通过SF - ICP - MS测定的苔藓和土壤样品中钚的活度以及通过HPGe测定的铯的活度如下：铯在苔藓中的活度为0 - 2.29 Bq/kg，在土壤中的活度为1.5 - 11.9 Bq/kg；钚在苔藓中的活度为0.025 - 0.25 Bq/kg，在土壤中的活度为0.07 - 0.51 Bq/kg。钚/钚原子比的范围（苔藓中为0.201，土壤中为0.184）和钚/铯活度比的范围（苔藓中为0.128，土壤中为0.044）表明，研究区域内的铯和钚主要来源于全球沉降。铯和钚在土壤中的分布相似。然而，由于苔藓生长环境的差异，它们在苔藓中的行为有很大不同。铯和钚从土壤到苔藓的转移因子在不同生长阶段和特定环境中有所变化。苔藓中的铯、钚与土壤衍生放射性核素之间存在弱正相关，表明这里再沉积作用占主导。铍、铅与土壤衍生放射性核素之间的负相关表明铍和铅来自大气成分，而它们之间的弱相关性表明其具体来源不同。由于使用农业肥料，铜和镍在这里的苔藓中中度富集，同时，在交通较为发达的浪坪地区锌含量较高。
