Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/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
![]() |
ISSN | 0027-8424 |
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 |
URL | 查看原文 |
引用统计 | |
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 |
推荐引用方式 GB/T 7714 | 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. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论