GSTDTAP  > 地球科学
DOI10.1073/pnas.1807267115
Discovery of fissionogenic Cs and Ba capture five years after Oklo reactor shutdown
Groopman, Evan E.1; Willingham, David G.1; Meshik, Alex P.2; Pravdivtseva, Olga V.2
2018-08-28
发表期刊PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
ISSN0027-8424
出版年2018
卷号115期号:35页码:8676-8681
文章类型Article
语种英语
国家USA
英文摘要

Understanding the release and sequestration of specific radioactive signatures into the environment is of extreme importance for long-term nuclear waste storage and reactor accident mitigation. Recent accidents at the Fukushima and Chernobyl nuclear reactors released radioactive Cs-137 and Cs-134 into the environment, the former of which is still live today. We have studied the migration of fission products in the Oklo natural nuclear reactor using an isotope imaging capability, the NAval Ultra-Trace Isotope Laboratory's Universal Spectrometer (NAUTILUS) at the US Naval Research Laboratory. In Oklo reactor zone (RZ) 13, we have identified the most depleted natural U of any known material with a U-235/U-238 ratio of 0.3655 +/- 0.0007% (2 sigma). This sample contains the most extreme natural burnup in Sm-149, Eu-151, Gd-155, and Gd-157, which demonstrates that it was sourced from the most active Oklo reactor region. We have discovered that fissionogenic Cs and Ba were captured by Ru metal/sulfide aggregates shortly following reactor shutdown. Isochrons from the Ru aggregates place their closure time at 4.98 +/- 0.56 y after the end of criticality. Most fissionogenic Ba-135 and Ba-137 in the Ru migrated and was incorporated as Cs over this period. Excesses in Ba-134 in the Ru point to the burnup of Cs-133. Cesium and Ba were retained in the Ru despite local volcanic activity since the reactor shutdown and the high level of activity during reactor operation.


英文关键词Oklo SIMS AMS isotope imaging natural fission reactor
领域地球科学 ; 气候变化 ; 资源环境
收录类别SCI-E
WOS记录号WOS:000442861600039
WOS关键词BARIUM RUTHENIUM OXIDE ; ION MASS-SPECTROMETRY ; NATURAL REACTORS ; RARE-EARTH ; CATION SUBSTITUTION ; TERNARY OXIDES ; ZONE 13 ; URANIUM ; GABON ; BANGOMBE
WOS类目Multidisciplinary Sciences
WOS研究方向Science & Technology - Other Topics
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被引频次:7[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/204974
专题地球科学
资源环境科学
气候变化
作者单位1.US Navy, Res Lab, Mat Sci & Technol Div, Washington, DC 20375 USA;
2.Washington Univ St Louis, Phys Dept, St Louis, MO 63130 USA
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Groopman, Evan E.,Willingham, David G.,Meshik, Alex P.,et al. Discovery of fissionogenic Cs and Ba capture five years after Oklo reactor shutdown[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2018,115(35):8676-8681.
APA Groopman, Evan E.,Willingham, David G.,Meshik, Alex P.,&Pravdivtseva, Olga V..(2018).Discovery of fissionogenic Cs and Ba capture five years after Oklo reactor shutdown.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,115(35),8676-8681.
MLA Groopman, Evan E.,et al."Discovery of fissionogenic Cs and Ba capture five years after Oklo reactor shutdown".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 115.35(2018):8676-8681.
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