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Time-resolved record of 236U and 239,240Pu isotopes from a coral growing during the nuclear testing program at Enewetak Atoll (Marshall Islands)

Chan, W. Y.

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Fallon, S. J.

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Fifield, L. K.

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Froehlich, M. B.

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Tims, S. G.

2016
A comprehensive series of nuclear tests were carried out by the United States at Enewetak Atoll in the Marshall Islands, especially between 1952 and 1958. A Porites Lutea coral that was growing in the Enewetak lagoon within a few km of all of the high-yield tests contains a continuous record of isotopes, which are of interest (e.g. 14 C, 236 U, 239, 240 Pu) through the testing period. Prior to the present work, 14C measurements at ~2-month resolution had shown pronounced peaks in the D 14C data that coincided with the times at which tests were conducted. Here were port measurements of 236 U and 239, 240 Pu on the same coral using accelerator mass spectrometry, and again nd prominent peaks in the concentrations of these isotopes that closely follow those in 14C. Consistent with the 14C data, the magnitudes of these peaks do not, however, correlate well with the explosive yields of the corresponding tests, indicating that smaller tests probably contributed disproportionately to the debris that fell in the lagoon. Additional information about the different tests can also be obtained from the 236 U/ 239 Pu and 240 Pu/ 239 Pu ratios, which are found to vary dramatically over the testing period. In particular, the rst thermonuclear test, Ivy-Mike, has characteristic 236 U/239 Pu and 240 Pu/ 239 Pu signatures which are diagnostic of the rst arrival of nuclear test material in various archives.
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Available Online

MNRE

2006
The community based conservation (CBC)paradigm predicts that sustainable biodiversity can only be achieved if local people perceive benefits from conservation. Through interviews, the situation in Samoa portrays that the CBC of mangroves was received with apprehension because the mangrove biodiversity was more significant than sustaining the livelihood of the local communities. In contrast, Iriomote Island residents were able to achieve maximum socio-economic benefits but to the extent that they were over commercializing the mangrove ecosystem. More research is imperative to find out how biodiversity conservation can be married with sustainable development objectives to sustain the local communities' livelihood.