Sr137 online dating


03-Jul-2016 23:07

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Horizontal error bars represent combined counting and calibration uncertainties (1 σ) for gamma spectrometry data and combined statistical and systematic errors (1 σ) for AMS data.

The right axis shows ages derived from the CRS age model.

Above 18 cm depth the Pu atom ratio decreases significantly from ~0.34 to ~0.24, presumably largely due to the influence of the post-moratorium tests at Novaya Zemlya leading to global fallout with a lower ratio.

In the upper part of the core covering the 1970’s to the 2000’s, approximately 30–60% can be attributed to integrated global fallout.

Plutonium-239 activity concentrations determined in sediment layers by AMS are plotted in Fig. The isotope was detected in the top 30 cm of the core, with high activity concentrations, comparable to those from deep ocean sediments between the major test sites of the PPG.

Below this depth traces of Pu were found, these however are almost two orders of magnitude lower than activities above 30 cm and are probably the result of natural replacement (e.g., due to biological or physical mixing) or reflect displacement of material during sampling. Although the atmospheric radionuclide concentrations decreased, radionuclides in the oceans remain to great part in the water column.

Unusually high concentrations of americium and plutonium have been observed in a sediment core collected from the eastern Lombok Basin between Sumba and Sumbawa Islands in the Indonesian Archipelago.

Gamma spectrometry and accelerator mass spectrometry data together with radiometric dating of the core provide a high-resolution record of ongoing deposition of anthropogenic radionuclides.

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This finding is in agreement with the high accumulation rates observed at the study site, which are exceptional for deep sea sediments.. The Partial Nuclear Test Ban Treaty came into effect in October 1963 leading to a subsequent significant decrease in atmospheric fallout. For more recent PPG derived plutonium, we have used an alternative end-member value of 0.27 ± 0.03, to better reflect the material being continuously released from the PPG sediments.Pu atom ratio and fractions derived from PPG versus integrated global fallout remain at elevated, rather constant levels during 1960’s. The authors declare no competing financial interests. This work is licensed under a Creative Commons Attribution 4.0 International License.



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