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- W4387359927 abstract "Abstract A method has been developed for solving the Fredholm equation in the barrier geometry for reconstructing the surface radioactive contamination density from the results of measuring the ambient dose equivalent rate (ADER). Inclusion of the barrier geometry means that the method takes into account the shielding effect of buildings and structures on the contaminated site. The method was based on the representation of the industrial site, buildings and radiation fields in the form of a raster and the use of the visibility matrix of raster cells to describe the barrier geometry. The developed method was applied to a model industrial site with a size of 200x200 conventional units for 4 types of surface activity density (SAD) distribution over the surface of the industrial site: fragmentation, diffuse, uniform and random. The method of Lorentz curves was applied to estimate the compactness of the distributions of surface activity density and the ADER for the considered radiation sources. It was shown that the difference between the Lorentz curve for SAD and ADER means that the determination of the spatial distribution of SAD over the industrial site by solving the integral equation is essentially useful for determining the location of radiation source locations on the industrial site. The accuracy of SAD reconstruction depends on the following parameters: resolution (fragmentation) of the raster, the height of the radiation detector above the scanned surface, and the angular aperture of the radiation detector. The measurement of ADER is simpler and quicker than the direct measurement of SAD and its distribution. This represents a significant advantage if SAD distribution needs to be determined in areas with high radiation dose-rate during limited time. The developed method useful for supporting radiation monitoring and optimizing the remediation of nuclear legacies, as well as during the recovery phase after a major accident.
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- W4387359927 date "2023-10-05" @default.
- W4387359927 modified "2023-10-16" @default.
- W4387359927 title "Further development and application of a method for assessing radionuclide surface activity distribution and source location based on measurements of ambient dose equivalent rate" @default.
- W4387359927 doi "https://doi.org/10.1088/1361-6498/ad005b" @default.
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