Long-lived radionuclides in marine sediments from the Beibu Gulf, South China Sea: Spatial distribution, controlling factors, and proxy for transport pathway

Lin, Wen‐Wei; Feng, Yu; Yu, Kefu; Lan, Wenlu; Wang, Yinghui; Mo, Zhenni; Ning, Qiuyun; Feng, Liangliang; He, Xintong; Huang, Yinlin

doi:10.1016/j.margeo.2020.106157

Cited by 26 publications

(6 citation statements)

References 38 publications

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“…238 U has significant strong positive correlations with mud content (Pearson's R = 0.678) and weak positive correlation with OM (Pearson's R = 0.357), indicating the effect of fine particles and OM on the distribution of 238 U [37]. 238 U has moderate positive correlations with 232 Th (Pearson's R = 0.419), this is due to the co-existence of U and Th radionuclides in nature [69,85,88], which is reflected by the presence of both radioelements in the SEM/EDX of monazite grain (Figure 4). 232 Th has significant strong positive correlations with heavy minerals index (Pearson's R = 0.696).…”

Section: Multivariate Statistical Analysesmentioning

confidence: 99%

Radiation Hazard from Natural Radioactivity in the Marine Sediment of Jeddah Coast, Red Sea, Saudi Arabia

Al-Mur

Gad

2022

JMSE

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Marine sediment samples were collected along the Jeddah coast, Red Sea, Saudi Arabia, in order to assess radiation hazards and the exposure to human and marine living organisms. Using collaborative techniques, grain size, mineralogical characteristics, and natural radioactivity were investigated. To examine the influence of sediment characteristics over the distribution of the measured radionuclides, resulting data were statistically processed by using multivariate analyses. 238U, 232Th, and 40K levels were specified to be 19.50, 9.38, and 403.31 Bq kg−1, respectively. Radionuclides distributions were affected by sediment mud content, organic matter, and heavy minerals index. The calculated radiation risk parameters are within the safe range and lower than the global average. Natural radiation from these marine sediments is normal and poses no significant radiological risk to the public or marine living organisms. The natural radioactivity of the marine sediment in this Jeddah coastline will have to be monitored on a regular basis to avoid overexposure to the residents.

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Section: Multivariate Statistical Analysesmentioning

confidence: 99%

Radiation Hazard from Natural Radioactivity in the Marine Sediment of Jeddah Coast, Red Sea, Saudi Arabia

Al-Mur

Gad

2022

JMSE

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“…The study of radionuclides in sediments is usually built on its relationships with sedimentological variables, given their known association in coastal and ocean sediments (Ligero et al, 2001;El-Reefy et al, 2014;Valan et al, 2017;Lin et al, 2020). Factors that explain this affinity are the availability of more adsorption sites in fine-grained sediments than in coarse-grained sediments, binding and fixation in organic matter, incorporation in suspended materials, and dilution effects caused by the presence of carbonates, among others (Ligero et al, 2001).…”

Section: Discussionmentioning

confidence: 99%

Spatial trends in the distribution of natural radioisotopes in the bottom sediments of Santos Basin (Brazil)

et al. 2023

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Ocean and Coastal ResearchActivities related to the marine exploration of oil and gas reservoirs tend to cause a concentration of natural radionuclides in related materials. As such, knowledge regarding the distribution of radionuclides in sedimentary basins with current oil operations is essential for modeling radiological hazards and possible risks of site contamination. This study investigated the distribution of 226Ra and 228Ra, radioisotopes from the 232U and 232Th decay chains in bottom sediment of the Santos basin. Sediment samples were collected from sites in a sampling grid based on depth contours and were analyzed through high-resolution gamma spectrometry. A distribution model of the spatial variation of these isotopes, the first of its kind for the Basin, supported the interpretation of similar tendencies in their distribution. From studying the spatial trends of the mean levels of the isotopes with descriptive statistics and variance analysis, latitudinal and bathymetric differences in the content of radionuclides emerged. These differences are probably derived from the distinct sources of these elements, as 226 Ra originates in the deep ocean from the decay of parent 230 Th and from the patterns of sedimentation driven by open ocean circulation, while 228Ra is supplied by terrigenous materials transported by the northward-flowing Brazilian Coastal Current.

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“…The Beibu Gulf is typical mangrove marine ecosystem. Mangroves, seagrass and coral reefs coexist along the coastline of the Beibu Gulf (Lin et al, 2020). The sea areas with seagrass beds basically have green sea turtles (Chambault et al, 2018).…”

Section: Analysis On the Migration Routes And Foraging Sitementioning

confidence: 99%

Migratory movements and foraging grounds of endangered green sea turtles in South China Sea based on satellite telemetry during fishing moratorium

Xia²,

Yang

et al. 2023

Front. Mar. Sci.

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The insights gained from individual tracking can improve the conservation of released young green sea turtles by providing detailed data on migration route, feeding place and habitat distribution. During the fishing moratorium from May 1 to August 16 in 2021, we used satellites to track 6 juvenile green sea turtles released from China’s Huidong Sea Turtle Nature Reserve, and located and reconstructed their migration routes and foraging sea areas. The tracking data shows that the longest tracking time is 91 days, the shortest time is 10 days, and the total tracking time is 213 days, of which three (50%) obtained tracking data for more than one month, and the total movement distances (statistics LC3-LCB) ranges from 124 to 4627 km, while the accurate movement distances (counted by dot pitch above LC0) ranged from 39.5-2331 km. The average daily movement distances ranges from 3.95 to 51.4 km, and the average speed varies between 0.16 to 2.14 km/h. The green turtles released from the China Turtle Bay migrate along the northern coastline of the South China Sea or go straight to the South China Sea. After a month or so, they migrate from Huidong Turtle Bay to Hainan Lingao, Beibu Gulf and Xisha Islands. The northern coast of the South China Sea is one of the migration routes of green sea turtles. Beibu Bay, Zhanjiang Port, Daya Bay, Red Bay, Nan’ao Island, Zhelin Bay and Xisha Islands are important foraging places for green sea turtles. The protection of migration routes and important foraging grounds is one of the key measures to protect sea turtles.

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Long-lived radionuclides in marine sediments from the Beibu Gulf, South China Sea: Spatial distribution, controlling factors, and proxy for transport pathway

Cited by 26 publications

References 38 publications

Radiation Hazard from Natural Radioactivity in the Marine Sediment of Jeddah Coast, Red Sea, Saudi Arabia

Radiation Hazard from Natural Radioactivity in the Marine Sediment of Jeddah Coast, Red Sea, Saudi Arabia

Spatial trends in the distribution of natural radioisotopes in the bottom sediments of Santos Basin (Brazil)

Migratory movements and foraging grounds of endangered green sea turtles in South China Sea based on satellite telemetry during fishing moratorium

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