Spatial and temporal distribution of Pu in the Northwest Pacific Ocean using modern coral archives SCIE SCOPUS

Cited 20 time in WEB OF SCIENCE Cited 19 time in Scopus
Title
Spatial and temporal distribution of Pu in the Northwest Pacific Ocean using modern coral archives
Author(s)
Lindahl, Patric; Andersen, Morten B.; Keith-Roach, Miranda; Worsfold, Paul; Hyeong, Kiseong; Choi, Min-Seok; Lee, Sang-Hoon
KIOST Author(s)
Hyeong, Ki Seong(형기성)Lee, Sang Hoon(이상훈)
Publication Year
2012-04
Abstract
Historical (PU)-P-239 activity concentrations and Pu-240/Pu-239 atom ratios were determined in skeletons of dated modern corals collected from three locations (Chuuk Lagoon, Ishigaki Island and Iki Island) to identify spatial and temporal variations in Pu inputs to the Northwest Pacific Ocean. The main Pu source in the Northwest Pacific is fallout from atmospheric nuclear weapons testing which consists of global fallout and close-in fallout from the former US Pacific Proving Grounds (PPG) in the Marshall Islands. PPG close-in fallout dominated the Pu input in the 1950s, as was observed with higher Pu-240/Pu-239 atom ratios (>0.30) at the Ishigaki site. Specific fallout Pu contamination from the Nagasaki atomic bomb and the Ivy Mike thermonuclear detonation at the PPG were identified at Ishigaki Island from the Pu-240/Pu-239 atom ratios of 0.07 and 0.46, respectively. During the 1960s and 1970s, global fallout was the major Pu source to the Northwest Pacific with over 60% contribution to the total Pu. After the cessation of the atmospheric nuclear tests, the PPG again dominated the Pu input due to the continuous transport of remobilised Pu from the Marshall Islands along the North Equatorial Current and the subsequent Kuroshio Current. The Pu contributions from the PPG in recent coral bands (1984 onwards) varied over time with average estimated PPG contributions between 54% and 72% depending on location. (C) 2011 Elsevier Ltd. All rights reserved.
ISSN
0160-4120
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/3601
DOI
10.1016/j.envint.2011.08.004
Bibliographic Citation
ENVIRONMENT INTERNATIONAL, v.40, pp.196 - 201, 2012
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Subject
PU-240/PU-239 ISOTOPIC-RATIOS; EAST CHINA SEA; PLUTONIUM ISOTOPES; MASS-SPECTROMETRY; FALLOUT PLUTONIUM; OKINAWA TROUGH; SURFACE WATERS; RADIONUCLIDES; CS-137; TRANSPORT
Keywords
Plutonium; Isotopic ratio; Coral; Close-in fallout; Global fallout
Type
Article
Language
English
Document Type
Article
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
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