Tritium Atmospheric Transport And Deposition Following Acute Releases PDF Download
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Total Pages | : 7 |
Release | : 1990 |
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Download Tritium Atmospheric Transport and Deposition Following Acute Releases Book in PDF, ePub and Kindle
During 35 years of operation of the Savannah River Site (SRS) there have been a small number of inadvertent tritium releases to the atmosphere. After detection of the releases by stack monitors, field crews were dispatched to determine the concentration of tritium in the environment. The objective of the measurement was to verify environmental concentrations calculated by dose assessment models. Air samples were used to verify the concentration levels and tritium forms during the plume passage. It was not feasible to take enough samples in the plume path to determine the two dimensional distribution of tritium concentration in the plume. However, the ground level distribution was very well reflected vegetation samples. Therefore, it is unusually possible to determine plume shape, plume width, and the relative maximum concentration as the plume moves downwind from the vegetation samples. In eight of the nine releases studied, the monitoring data allowed comparison with atmospheric transport models.
Author | : James Anderson |
Publisher | : |
Total Pages | : 1110 |
Release | : 1992 |
Genre | : Controlled fusion |
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Download Proceedings of the Fourth Topical Meeting on Tritium Technology in Fission, Fusion, and Isotopic Applications Book in PDF, ePub and Kindle
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Total Pages | : 410 |
Release | : 1992-06 |
Genre | : Power resources |
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Download Energy Research Abstracts Book in PDF, ePub and Kindle
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Release | : 1978 |
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Download Environmental Transport and Cycling of Tritium in the Vicinity of Atmospheric Releases. [Savannah River Plant]. Book in PDF, ePub and Kindle
Routine releases of tritium to the atmosphere from the Savannah River Plant (SRP) have averaged 5.12 x 105 curies per year during the period 1974 to 1977. Patterns of tritium dispersion in the environment surrounding SRP indicate a power law relationship between air concentration and distance from the source. The relationship between the concentration of tritiated water in vegetation and distance is more complex. A model of the tritium dispersion and cycling in the environment explains the dispersion patterns in terms of the ratio of tritiated hydrogen to tritiated water, climate, and vegetation characteristics. The annual variation in the environmental patterns around the SRP is almost completely determined by the fraction of tritiated hydrogen in the release.
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Release | : 2012 |
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Download MODELING TRITIUM TRANSPORT, DEPOSITION AND RE-EMISSION. Book in PDF, ePub and Kindle
The atmospheric release of tritium oxide (HTO) potentially impacts human health, typically through inhalation or absorption. Due to HTO's similarity to water, vegetation will absorb HTO by solution in the leaf water and then re-emit it, creating a number of secondary sources of HTO. Currently, models used for emergency response at Savannah River Site incorporate the transport and deposition of HTO but do not provide estimates for its potential re-emission from vegetation or soil surface though re-emission could result in prolonged exposure and greater than predicted dose for an individual downwind. A simple model of HTO transport, deposition and re-emission has been developed to examine the potential increase in exposure and dose. The model simulates an initial release of HTO that moves with a mean wind and expands through diffusion as a Gaussian puff. Deposition is modeled using previous estimates of deposition velocity for HTO and re-emission is modeled using a time constant that describes how quickly HTO is transferred between the surface and atmosphere. Additional puffs are created to simulate re-emission of HTO as well as horizontal diffusion across model grid cells. An evaluation of field data indicates that the use of a re-emission module tends to improve model predictions through improved prediction of peak concentration magnitude and location. When considering dose, nearly all of the released material is included in the dose calculation when re-emission is included. Although exposure to HTO through re-emission occurs over a few hours, the incremental increase in dose is relatively small because the atmospheric concentration of re-emitted HTO is much lower than the initial release.
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Total Pages | : 888 |
Release | : 1992 |
Genre | : Fusion reactors |
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Download Fusion Technology Book in PDF, ePub and Kindle
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Total Pages | : 1590 |
Release | : 1974 |
Genre | : Nuclear energy |
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Download Nuclear Science Abstracts Book in PDF, ePub and Kindle
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Total Pages | : 34 |
Release | : 1991 |
Genre | : |
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Download An Atmospheric Tritium Release Database for Model Comparisons Book in PDF, ePub and Kindle
A database of vegetation, soil, and air tritium concentrations at gridded coordinate locations following nine accidental atmospheric releases is described. While none of the releases caused a significant dose to the public, the data collected is valuable for comparison with the results of tritium transport models used for risk assessment. The largest, potential, individual off-site dose from any of the releases was calculated to be 1.6 mrem. The population dose from this same release was 46 person-rem which represents 0.04% of the natural background radiation dose to the population in the path of the release.
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Release | : 1995 |
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Download An Atmospheric Tritium Release Database for Model Comparisons. Revision 1 Book in PDF, ePub and Kindle
A database of vegetation, soil, and air tritium concentrations at gridded coordinate locations following nine accidental atmospheric releases is described. While none of the releases caused a significant dose to the public, the data collected are valuable for comparison with the results of tritium transport models used for risk assessment. The largest, potential, individual off-site dose from any of the releases was calculated to be 1.6 mrem. The population dose from this same release was 46 person-rem which represents 0.04% of the natural background radiation dose to the population in the path of the release.
Author | : Stacey L. Fox |
Publisher | : |
Total Pages | : 196 |
Release | : 2001 |
Genre | : |
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Download Computer Modeling of Environmental Tritium Transport Following Chronic Releases Using NORMTRI and CAP88PC-2 Book in PDF, ePub and Kindle