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Iodine-129 as an oceanic tracer.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Iodine-129 as an oceanic tracer./
Author:	Chang, Ching-Chih Ginger.
Description:	1 online resource (93 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 78-04, Section: B.
Contained By:	Dissertations Abstracts International78-04B.
Subject:	Geochemistry. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10164402click for full text (PQDT)
ISBN:	9781369188943

Iodine-129 as an oceanic tracer.
Chang, Ching-Chih Ginger.

Iodine-129 as an oceanic tracer. - 1 online resource (93 pages)

Source: Dissertations Abstracts International, Volume: 78-04, Section: B.

Thesis (Ph.D.)--The University of Arizona, 2016.

Includes bibliographical references

The long-lived radionuclide 129I (half-life: 15.7 x 106 yr) is well-known as a useful environmental tracer. At present, the global 129I in surface water is about 1-2 orders of magnitude higher than pre-1960 levels. In order to understand the spread of 129I in the Pacific Ocean, 129I time series from corals and seawater were reconstructed. Two iodine extraction methods were tested and compared to optimize the yield and precision of the measurements. A solvent extraction method was chosen over a resin column preparation technique giving that it provides higher signal and lower error. Coral 129I time series records from the Western Pacific including Con Dao and Xisha Islands, in the South China Sea; Rabaul, Papua New Guinea, in the South Pacific; and Guam in the North Pacific were reconstructed and pathways and sources of 129I from the 1950s onward were assessed. Nuclear weapons testing was the primary 129I source to the ocean, notably from testing in the Marshall Islands and radiogenic iodine was carried primarily through surface ocean currents. A seawater 129I monitoring program was instituted with seawater samples from Scripps Pier, La Jolla, California, USA a few months after the Great East Japan Earthquake, which involved the accidental release of substantial amounts of 129I from the Fukushima Daichi nuclear power plant. These data were used to construct a 4-year record of surface water 129I with monthly resolution. 129I in Hanford site vicinity is also surveyed to understand the background value of the California Current System. It is clear that the California Current System is influenced by the Hanford site which can explain the higher 129I/127I background values observed along the west coast of the U.S. compared to other surface sites in the Pacific Ocean. Our result shows that the highly contaminated seawater from the Fukushima Daiichi Nuclear Power Plant accident has not yet seen at the Scripps Pier, La Jolla, California, USA four years of ocean transport.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9781369188943Subjects--Topical Terms:

539092
Geochemistry.
Subjects--Index Terms:

CoralIndex Terms--Genre/Form:

542853
Electronic books.

Iodine-129 as an oceanic tracer.
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500 $a Source: Dissertations Abstracts International, Volume: 78-04, Section: B.
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502 $a Thesis (Ph.D.)--The University of Arizona, 2016.
504 $a Includes bibliographical references
520 $a The long-lived radionuclide 129I (half-life: 15.7 x 106 yr) is well-known as a useful environmental tracer. At present, the global 129I in surface water is about 1-2 orders of magnitude higher than pre-1960 levels. In order to understand the spread of 129I in the Pacific Ocean, 129I time series from corals and seawater were reconstructed. Two iodine extraction methods were tested and compared to optimize the yield and precision of the measurements. A solvent extraction method was chosen over a resin column preparation technique giving that it provides higher signal and lower error. Coral 129I time series records from the Western Pacific including Con Dao and Xisha Islands, in the South China Sea; Rabaul, Papua New Guinea, in the South Pacific; and Guam in the North Pacific were reconstructed and pathways and sources of 129I from the 1950s onward were assessed. Nuclear weapons testing was the primary 129I source to the ocean, notably from testing in the Marshall Islands and radiogenic iodine was carried primarily through surface ocean currents. A seawater 129I monitoring program was instituted with seawater samples from Scripps Pier, La Jolla, California, USA a few months after the Great East Japan Earthquake, which involved the accidental release of substantial amounts of 129I from the Fukushima Daichi nuclear power plant. These data were used to construct a 4-year record of surface water 129I with monthly resolution. 129I in Hanford site vicinity is also surveyed to understand the background value of the California Current System. It is clear that the California Current System is influenced by the Hanford site which can explain the higher 129I/127I background values observed along the west coast of the U.S. compared to other surface sites in the Pacific Ocean. Our result shows that the highly contaminated seawater from the Fukushima Daiichi Nuclear Power Plant accident has not yet seen at the Scripps Pier, La Jolla, California, USA four years of ocean transport.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
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653 $a Environmental tracers
653 $a Radionuclides
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773 0 $t Dissertations Abstracts International $g 78-04B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10164402 $z click for full text (PQDT)