Plutonium isotopes in the NW Pacific: besides the global fallout
Due to the application potential for tracing oceanographic processes, the study on the distribution and geochemical behavior of Pu isotopes is of increasing interest to the scientific community of marine science. General excess inventories of Pu over those expected from global fallout in sediments a...
Main Authors: | , |
---|---|
Format: | Conference Object |
Language: | English |
Published: |
2019
|
Subjects: | |
Online Access: | https://repo.qst.go.jp/?action=repository_uri&item_id=61702 http://id.nii.ac.jp/1657/00061690/ |
id |
ftnirs:oai:repo.qst.go.jp:00061702 |
---|---|
record_format |
openpolar |
spelling |
ftnirs:oai:repo.qst.go.jp:00061702 2023-05-15T18:25:36+02:00 Plutonium isotopes in the NW Pacific: besides the global fallout Zheng Jian Yamada Masatoshi 2019-02-20 https://repo.qst.go.jp/?action=repository_uri&item_id=61702 http://id.nii.ac.jp/1657/00061690/ en eng https://repo.qst.go.jp/?action=repository_uri&item_id=61702 http://id.nii.ac.jp/1657/00061690/ 2006-07-27 Presentation 2019 ftnirs 2021-12-30T07:55:13Z Due to the application potential for tracing oceanographic processes, the study on the distribution and geochemical behavior of Pu isotopes is of increasing interest to the scientific community of marine science. General excess inventories of Pu over those expected from global fallout in sediments and water column in the NW Pacific have been observed through the studies conducted in the 1970s-1990s. It has been speculated that the main source of these excess inventories could be the close-in and tropospheric fallout derived from large scale nuclear explosions at the Pacific Proving Ground (mainly on Bikini and Enewetok atolls) in the 1950s. In order to identify the source of Pu in the NW Pacific, we made a systematic investigation on the distribution of Pu isotopes in sediments, seawater and settling particles. Based on the obtained 240Pu/239Pu isotopic signature, we identified the wide presence of Bikini close-in fallout Pu in the studied regions. In this paper, we will discuss the possible oceanic process for the transport and scavenging of Bikini close-in fallout Pu containing particles, and evaluate the relative contribution of Pu between the global fallout and close-in fallout. Considerations on the future study of the distribution of Pu isotopes in the Southern Ocean within the framework of GEOTRACES Project will be presented. American Geophysical Union 2006 Western Pacific Geophysics Meeting Conference Object Southern Ocean National Institute of Radiological Science: NIRS-Repository Southern Ocean Pacific |
institution |
Open Polar |
collection |
National Institute of Radiological Science: NIRS-Repository |
op_collection_id |
ftnirs |
language |
English |
description |
Due to the application potential for tracing oceanographic processes, the study on the distribution and geochemical behavior of Pu isotopes is of increasing interest to the scientific community of marine science. General excess inventories of Pu over those expected from global fallout in sediments and water column in the NW Pacific have been observed through the studies conducted in the 1970s-1990s. It has been speculated that the main source of these excess inventories could be the close-in and tropospheric fallout derived from large scale nuclear explosions at the Pacific Proving Ground (mainly on Bikini and Enewetok atolls) in the 1950s. In order to identify the source of Pu in the NW Pacific, we made a systematic investigation on the distribution of Pu isotopes in sediments, seawater and settling particles. Based on the obtained 240Pu/239Pu isotopic signature, we identified the wide presence of Bikini close-in fallout Pu in the studied regions. In this paper, we will discuss the possible oceanic process for the transport and scavenging of Bikini close-in fallout Pu containing particles, and evaluate the relative contribution of Pu between the global fallout and close-in fallout. Considerations on the future study of the distribution of Pu isotopes in the Southern Ocean within the framework of GEOTRACES Project will be presented. American Geophysical Union 2006 Western Pacific Geophysics Meeting |
format |
Conference Object |
author |
Zheng Jian Yamada Masatoshi |
spellingShingle |
Zheng Jian Yamada Masatoshi Plutonium isotopes in the NW Pacific: besides the global fallout |
author_facet |
Zheng Jian Yamada Masatoshi |
author_sort |
Zheng Jian |
title |
Plutonium isotopes in the NW Pacific: besides the global fallout |
title_short |
Plutonium isotopes in the NW Pacific: besides the global fallout |
title_full |
Plutonium isotopes in the NW Pacific: besides the global fallout |
title_fullStr |
Plutonium isotopes in the NW Pacific: besides the global fallout |
title_full_unstemmed |
Plutonium isotopes in the NW Pacific: besides the global fallout |
title_sort |
plutonium isotopes in the nw pacific: besides the global fallout |
publishDate |
2019 |
url |
https://repo.qst.go.jp/?action=repository_uri&item_id=61702 http://id.nii.ac.jp/1657/00061690/ |
geographic |
Southern Ocean Pacific |
geographic_facet |
Southern Ocean Pacific |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
https://repo.qst.go.jp/?action=repository_uri&item_id=61702 http://id.nii.ac.jp/1657/00061690/ 2006-07-27 |
_version_ |
1766207177374040064 |