239Pu, 240Pu, 241Pu, 241Am, 137Cs, and 210Pb in seafloor sediments in the western North Pacific Ocean and the Sea of Japan: distributions, sources and budgets

Yamada, Masatoshi; Oikawa, Shinji

doi:10.1007/s10967-022-08332-y

Cited by 6 publications

(2 citation statements)

References 79 publications

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“…High 239,240 Pu/ 137 Cs activity ratios have been reported in sediments from other coastal sites in Asia, such as in Malaysia (0.1-1.2, decay corrected to 2024) [13], in the Sagami Bay (1.13 ± 0.3, decay corrected to 2024) [27] and the Tokyo Bay (0.87 ± 0.24, decay corrected to 2024) [28]. The high 239,240 Pu/ 137 Cs activity ratios in the sediments is likely explained by a preferential scavenging of Pu over Cs by suspended particulates [13,29]. In seawater, the two chemical elements show different a nities to suspended particulate, but also solubilities and biological uptake.…”

Section: Activity and Isotope Ratiosmentioning

confidence: 89%

“…Known Pu isotope ratios are: fallout from nuclear weapon testing sites of French Polynesia [31,32], Castle Bravo [33][34][35] and Montebello Islands [36]; and global fallout [20,37]. Known 239+240 Pu/ 137 Cs activity ratios are: global fallout [24], fallout from the Chernobyl accident [26] and in coastal sediments of southasia [13,27,28]. Reference date for decay correction is 01.06.2024.…”

Section: Discussionmentioning

confidence: 99%

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Levels of natural and anthropogenic radionuclides in selected environmental radioactivity monitoring sites in Singapore

Wong,

Tan,

Alvarado

2024

Preprint

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This paper provides insights into the radioactivity levels in soil, sediment and surface seawater from selected monitoring sites in Singapore. The environmental samples were measured for naturally occurring and anthropogenic radionuclides. In soils, the decay series of 232Th and 238U are the highest contributors to the total radioactivity, while in sediments, 40K is the main contributor to the total radioactivity. The levels of 90Sr, 137Cs and 239+240Pu are also reported. The data demonstrates that the main source of anthropogenic radionuclides in soils is the global fallout from nuclear weapons testings; in sediments, contributions from the Pacific Proving Grounds have been identified. This study also highlights significant differences in radioactivity levels in soils between the northern and central regions of Singapore, which are attributed to the histories of the monitoring sites.

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