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Experimental techniques for dry deposition measurements

Description: Recent experimental approaches for measurement of dry surface fluxes of sulfur compounds are reviewed and discussed with emphasis on surface layer studies. Evidence indicates that natural surfaces are sources as well as sinks for sulfur. Field results are related to requirements and implications in future studies of surface sulfur fluxes.
Date: October 1, 1979
Creator: Droppo, J. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Modeled atmospheric radon concentrations from uranium mines

Description: Uranium mining and milling operations result in the release of radon from numerous sources of various types and strengths. The US Environmental Protection Agency (EPA) under the Clean Air Act, is assessing the health impact of air emissions of radon from underground uranium mines. In this case, the radon emissions may impact workers and residents in the mine vicinity. To aid in this assessment, the EPA needs to know how mine releases can affect the radon concentrations at populated locations. T… more
Date: April 1, 1985
Creator: Droppo, J. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Assessment of the radon concentrations in air caused by emissions from multiple sources in a uranium mining and milling region. A case study of the Ambrosia Lake region of New Mexico

Description: The Ambrosia Lake uranium mining and milling operations were selected to characterize the relative importance of these sources on ambient atmospheric radon concentrations. All uranium mines at Ambrosia Lake are underground. The comparisons of interest were both between the sources and between the sources and background concentrations. The results show that vents are by far the greatest source of the computed radon concentrations in the immediate area of the operations. The computed radon concen… more
Date: December 1, 1981
Creator: Droppo, J. G. & Glissmeyer, J. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Field determinations of HVdc ozone production rates

Description: The environment near a high voltage direct current (HVdc) transmission line experiences corona effects, including the production of oxidants. Field determination of ozone production rates were made at the Bonneville Power Administration (BPA) HVdc Test Facility, the Dalles, Oregon, in fall and winter 1977. A novel micrometeorological profiling technique was used to identify sources of ozone plumes. The results indicate that even during precipitation the atmospheric ozone concentrations from HVd… more
Date: February 1, 1979
Creator: Droppo, J. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Dry removal of air pollutants by vegetation canopies

Description: This study describes studies being conducted to quantify dry removal rates of air pollutants by natural surfaces. Processes involved are discussed in a resistance model framework. Values from the literature and results of current field tests relating to rates of dry removal are summarized for selected gases and particles, and the experimental accuracy of particulate sulfur deposition values is discussed.
Date: September 1, 1976
Creator: Droppo, J G
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Ozone field studies adjacent to a hvdc transmission test line

Description: Field studies of atmospheric ozone concentrations adjacent to high voltage direct current (hvdc) transmission test lines were conducted at the Bonneville Power Administration's (BPA) hvdc Test Facility at The Dalles, Oregon. The transmission lines were operating at voltages from +- 400 to +- 600 kV during the field studies. The downwind ozone plumes were studied using a roving vertical profiling system. Ambient meteorological and test line parameters were also recorded to allow comparison of pr… more
Date: March 1, 1979
Creator: Droppo, J. G.; Abbey, O. B. & Glover, D. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Technological considerations in emergency instrumentation preparedness. Phase II-C. Emergency radiological and meteorological instrumentation for fuel reprocessing facilities

Description: A reference fuel reprocessing plant, postulated to process fuels from light water reactors with initial enrichments less than 5 percent /sup 235/U or equivalent fissile content, with exposures in the vicinity of 40,000 MWd/MTU and cooling times of approximately 150 days, was used to determine the sources and magnitudes of radionuclide releases to the environment in the event of postulated accidents within the plant. Based on these estimates of accident generated conditions, performance criteria… more
Date: August 1, 1976
Creator: Andersen, B. V.; Carter, L. A. & Droppo, J. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Supplemental mathematical formulations, Atmospheric pathway: The Multimedia Environmental Pollutant Assessment System (MEPAS)

Description: The Multimedia Environmental Pollutant Assessment System (MEPAS) is an integrated software implementation of physics-based fate and transport models for health and environmental risk assessments of both radioactive and hazardous pollutants. This atmospheric component report is one of a series of formulation reports that document the MEPAS mathematical models. MEPAS is a ``multimedia`` model; pollutant transport is modeled within, through, and between multiple media (air, soil, groundwater, and … more
Date: March 1, 1996
Creator: Droppo, J. G. & Buck, J. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

MEPAS exposure model updates to meet current EPA guidance

Description: The Multimedia Environmental Pollutant Assessment System (MEPAS) is a software package developed for the US Department of Energy (DOE) as a management tool to screen the many potential hazardous waste problems at DOE facilities across the country. The program considers both radioactive and chemical pollutants in estimating potential human health risks based on site-specific waste, environmental transport, and exposure characteristics. To support various DOE programs, recent modifications have b… more
Date: December 1, 1993
Creator: Strenge, D. L. & Droppo, J. G. Jr.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Estimation of aerial deposition and foliar uptake of xenobiotics: Assessment of current models

Description: This report reviews existing mathematical and/or computer simulation models that estimate xenobiotic deposition to and transport through (both curricular and stomatal) vegetative surfaces. The report evaluates the potential for coupling the best of those models to the existing Uptake, Translocation, Accumulation, and Biodegradation model to be used for future xenobiotic exposure assessments. Here xenobiotic compounds are defined as airborne contaminants, both organic and gaseous pollutants, tha… more
Date: October 1, 1987
Creator: Link, S. O.; Fellows, R. J.; Cataldo, D. A.; Droppo, J. G. & Van Voris, P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Sensitivity study of six public health risk computation cases from the US Department of Energy risk- and cost-estimate process pilot study

Description: This report contains a description of the results from the analysis of the sensitivity of estimated public health risks to changes in model parameters relating to the contaminant source releases, contaminant transports, and human exposures contaminants from six waste sites. Estimated public health risks associated with these and other sites at US Department of Energy (DOE) compounds were reported in a pilot study done by the Oak Ridge National Laboratory (ORNL) for the DOE (ORNL 1992). The obje… more
Date: September 1, 1993
Creator: Chamberlain, P. J., II; Droppo, J. G., Jr.; Castleton, K. J. & Eslinger, P. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Large-scale multimedia modeling applications

Description: Over the past decade, the US Department of Energy (DOE) and other agencies have faced increasing scrutiny for a wide range of environmental issues related to past and current practices. A number of large-scale applications have been undertaken that required analysis of large numbers of potential environmental issues over a wide range of environmental conditions and contaminants. Several of these applications, referred to here as large-scale applications, have addressed long-term public health r… more
Date: August 1, 1995
Creator: Droppo, J. G., Jr.; Buck, J. W.; Whelan, G.; Strenge, D. L.; Castleton, K. J. & Gelston, G. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A demonstration of the applicability of implementing the enhanced Remedial Action Priority System (RAPS) for environmental releases

Description: The Remedial Action Priority System (RAPS) and the Multimedia Environmental Pollutant Assessment System (MEPAS) were developed to prioritize problems associated with potential releases of hazardous chemical and radioactive materials in a scientific and objective manner based on limited site information. This report documents the model testing efforts of the RAPS/MEPAS methodology for the atmospheric, surface water, groundwater, and exposure components. Comparisons are given of model outputs wit… more
Date: December 1, 1989
Creator: Whelan, G.; Droppo, J. G. Jr.; Strenge, D. L.; Walter, M. B. & Buck, J. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Models Selected for Calculation of Doses, Health Effects and Economic Costs Due to Accidental Radionuclide Releases From Nuclear Power Plants

Description: Models are described for use in site-specific environmental consequence analysis of nuclear reactor accidents of Classes 3 through 9. The models presented relate radioactivity released to resulting doses, health effects, and costs of remedial actions. Specific models are presented for the major exposure pathways of airborne releases, waterborne releases and direct irradiation from activity within the facility buildings, such as the containment. Time-dependent atmospheric dispersion parameters, … more
Date: May 1, 1980
Creator: Strenge, D. L.; Baker, D. A.; Droppo, J. G.; McPherson, R. B.; Napier, B. A.; Nieves, L. A. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Millimeter wave, high-resolution, holographic surveillance system

Description: Millimeter wave holographic imaging systems capable of imaging through clothing to detect contraband, metal, plastic, or ceramic weapons may provided a practical solution to personnel inspection needs in mass transportation centers. Traditional inspection systems, such as metal detectors and x-ray imaging systems, have limitations for the detection of concealed weapons. metal detectors are limited because they cannot detect plastic weapons and x-ray imaging systems are limited in use due to rad… more
Date: December 1, 1993
Creator: McMakin, D. L.; Sheen, D. M.; Collins, H. D.; Hall, T. E.; Smith, R. R. & Droppo, J. G. Jr.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The Multimedia Environmental Pollutant Assessment System (MEPAS){reg_sign}: Source-term release formulations

Description: This report is one of a series of reports that document the mathematical models in the Multimedia Environmental Pollutant Assessment System (MEPAS). Developed by Pacific Northwest National Laboratory for the US Department of Energy, MEPAS is an integrated impact assessment software implementation of physics-based fate and transport models in air, soil, and water media. Outputs are estimates of exposures and health risk assessments for radioactive and hazardous pollutants. Each of the MEPAS form… more
Date: November 1, 1996
Creator: Streile, G. P.; Shields, K. D.; Stroh, J. L.; Bagaasen, L. M.; Whelan, G.; McDonald, J. P. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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