Assessment of Gamma-ray Exposures Due to Finite Plumes

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Abstract
Extensive calculations of y-ray dose rates due to radionuclides in finite straight-line and meandering (sector-averaged) Gaussian plumes have been condensed to a form readily usable for rapid assessments of offsite radiological dose rates. Ground level, centerline dose factors ((mrad/hr) (m/sec) per μCi/sec released) have been prepared for use in a simplified equation. Factors for 13 noble gas nuclides have been prepared for two plume models, two release heights (0 and 100 m), seven stability classes (A-G), and six downwind ranges (400–76,090 m) to encompass ranges of parameters of interest. Given meteorological information (atmospheric stability class, wind direction and speed) and nuclide release information, one can quickly estimate downwind gamma-ray dose rates.

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