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资源环境科技发展态势分析平台
Global S&T Development Trend Analysis Platform of Resources and Environment
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发表日期:2014
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Tonopah Test Range Air Monitoring: CY2013 Meteorological, Radiological, and Airborne Particulate Observations
科技报告
来源:US Department of Energy (DOE). 出版年: 2014
作者:
Mizell, Steve A
;
Nikolich, George
;
Shadel, Craig
;
McCurdy, Greg
;
Etyemezian, Vicken
;
Miller, Julianne J
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浏览/下载:9/0
  |  
提交时间:2019/04/05
In 1963
the U.S. Department of Energy (DOE) (formerly the Atomic Energy Commission [AEC])
implemented Operation Roller Coaster on the Tonopah Test Range (TTR) and an adjacent area of the Nevada Test and Training Range (NTTR) (formerly the Nellis Air Force Range). This test resulted in radionuclide-contaminated soils at Clean Slate I
II
and III. This report documents observations made during on-going monitoring of radiological
meteorological
and dust conditions at stations installed adjacent to Clean Slate I and Clean Slate III and at the TTR Range Operations Control center. The primary objective of the monitoring effort is to determine if winds blowing across the Clean Slate sites are transporting particles of radionuclide-contaminated soils beyond both the physical and administrative boundaries of the sites. Results for the calendar year (CY) 2013 monitoring include: (1) the gross alpha and gross beta values from the monitoring stations are approximately equivalent to the highest values observed during the CY2012 reporting at the surrounding Community Environmental Monitoring Program (CEMP) stations (this was the latest documented data available at the time of this writing)
(2) only naturally occurring radionuclides were identified in the gamma spectral analyses
(3) the ambient gamma radiation measurements indicate that the average annual gamma exposure is similar at all three monitoring stations and periodic intervals of increased gamma values appear to be associated with storm fronts passing through the area
and (4) the concentrations of both resuspended dust and saltated sand particles generally increase with increasing wind speed. However
differences in the observed dust concentrations are likely due to differences in the soil characteristics immediately adjacent to the monitoring stations. Neither the resuspended particulate radiological analyses nor the ambient gamma radiation measurements suggest wind transport of radionuclide-contaminated soils.
IMPACTS OF INTERACTING ELEVATED ATMOSPHERIC CO2 AND O3 ON THE STRUCTURE AND FUNCTIONING OF A NORTHERN FOREST ECOSYSTEM: OPERATING AND DECOMMISSIONING THE ASPEN FACE PROJECT
科技报告
来源:US Department of Energy (DOE). 出版年: 2014
作者:
Burton, Andrew J.
;
Zak, Donald R.
;
Kubiske, Mark E.
;
Pregitzer, Kurt S.
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浏览/下载:2/0
  |  
提交时间:2019/04/05
Elevated carbon dioxide
Elevated ozone
Northern forests
Aspen
Birch: Sugar maple
FACE experiment
Net primary productivity
Ecosystem carbon storage
Community composition
Radiochemically-Supported Microbial Communities: A Potential Mechanism for Biocolloid Production of Importance to Actinide Transport
科技报告
来源:US Department of Energy (DOE). 出版年: 2014
作者:
Moser, Duane P
;
Hamilton-Brehm, Scott D
;
Fisher, Jenny C
;
Bruckner, James C
;
Kruger, Brittany
;
Sackett, Joshua
;
Russell, Charles E
;
Onstott, Tullis C
;
Czerwinski, Ken
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浏览/下载:24/0
  |  
提交时间:2019/04/05
Due to the legacy of Cold War nuclear weapons testing
the Nevada National Security Site (NNSS
formerly known as the Nevada Test Site (NTS)) contains millions of Curies of radioactive contamination. Presented here is a summary of the results of the first comprehensive study of subsurface microbial communities of radioactive and nonradioactive aquifers at this site. To achieve the objectives of this project
cooperative actions between the Desert Research Institute (DRI)
the Nevada Field Office of the National Nuclear Security Administration (NNSA)
the Underground Test Area Activity (UGTA)
and contractors such as Navarro-Interra (NI)
were required. Ultimately
fluids from 17 boreholes and two water-filled tunnels were sampled (sometimes on multiple occasions and from multiple depths) from the NNSS
the adjacent Nevada Test and Training Range (NTTR)
and a reference hole in the Amargosa Valley near Death Valley. The sites sampled ranged from highly-radioactive nuclear device test cavities to uncontaminated perched and regional aquifers. Specific areas sampled included recharge
intermediate
and discharge zones of a 100
000-km2 internally-draining province
known as the Death Valley Regional Flow System (DVRFS)
which encompasses the entirety of the NNSS/NTTR and surrounding areas. Specific geological features sampled included: West Pahute and Ranier Mesas (recharge zone)
Yucca and Frenchman Flats (transitional zone)
and the Western edge of the Amargosa Valley near Death Valley (discharge zone). The original overarching question underlying the proposal supporting this work was stated as: Can radiochemically-produced substrates support indigenous microbial communities and subsequently stimulate biocolloid formation that can affect radionuclides in NNSS subsurface nuclear test/detonation sites? Radioactive and non-radioactive groundwater samples were thus characterized for physical parameters
aqueous geochemistry
and microbial communities using both DNA- and cultivation-based tools in an effort to understand the drivers of microbial community structure (including radioactivity) and microbial interactions with select radionuclides and other factors across the range of habitats surveyed.