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Radiological Science and Engineering

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Comprehensive Epidemiologic Data Resource-Related Activities

The purpose of the Hanford Environmental Dose Reconstruction Project was to estimate radiation doses that individuals may have received as a result of Hanford Site emissions. The Hanford Data Visualization System draws a map of the Northwestern states overlaid with a rectangular study grid of sectors covering a 75,000-square mile area. Air concentration densities and representative dose estimates within the grid are available.

Annual air concentration densities of iodine-131 can be displayed for each of the seven highest emission release years. Annotated estimates of resulting doses are provided for a hypothetical set of 12 groups of representative individuals residing in any one of the 1102 sectors. Users may navigate among views, generate new ones, distinguish sector locations in relation to geographic landmarks/manmade features, compare sector values and produce hard-copy views. They may also display charts prepared for eight "near cities" and eight "far cities" selected to illustrate a variety of locations within the primary deposition pattern.

The purpose of the Historical Public Exposure Studies of the Rocky Flats Plant was to evaluate the doses and potential health impacts resulting from contaminant releases. The Individual Risk Calculator, available for public use from the Colorado Department of Public Health, provides personalized evaluations. The Rocky Flats Data Visualization System utilizes atmospheric release and transport data leading to risk estimation to map areas encompassing the plant and overlays them with an 850-square mile study grid of receptor locations spaced one kilometer apart. Reconstructed Time-Integrated Concentrations (TICs) for discrete releases of plutonium from incidents and TICs for continuous plutonium releases are available. Values interpolated between study grid receptor locations for each TIC are also provided.

TICs containing a range of multiple confidence levels at 2295 receptor locations for four different particle sizes can be displayed for the 1953 – 1989 operations period, including two fires during this period, and suspension of contaminated soil during high-wind events. TICs interpolated from receptor estimates may also be selected to categorize plume concentration patterns. Users may navigate among views, generate new ones, "zoom in" on aerial photographs of Rocky Flats facilities, distinguish receptor locations in relation to geographic landmarks/manmade features, compare receptor values and produce hard-copy views. In addition, charts of TICs at ten selected cities from the release incidents may be referenced.

Radiological Science and Engineering

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