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Enhancing Nuclear Safety


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Experimental and numerical study of the degradation of the nuclear measurement of radioactive aerosols collected with monitoring filters

Tony GERYES, doctorate of University Paris-Est, 196 p., defended on the 22th september 2009

Summary

The measurement of radioactivity in the filters of airborne radioactive surveillance is a major difficulty metrology. Indeed, the absorption of α radiation in the filter media and the mass of aerosols accumulated distort the nuclear counters response. This thesis work focuses on the determination of correction factors for the radioactivity loss in the survey filters.
In a first step, radioactive filters representing the atmospheric samples have been prepared using the nuclear test bench ICARE. The experimental study on reference filters provided a database to determine correction factors for various filtration conditions.
The second step of the work proposed a new numerical method developed to determine the correction factors. It consists of coupling GeoDict for particles filtration simulations and MCNPX simulations for α transport in matter. The good agreement obtained by comparing the numerical and experimental correction factors has permitted to validate the numerical model.
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Céline Monsanglant-Louvet, the thesis supervisor

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Thesis report


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