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Enhancing Nuclear Safety


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Use of voxel phantoms for the improvement of lung counting calibrations


Journal title : Radioprotection
Volume : 40
Issue : 3
Pagination : 307-326
Publication date : 01/09/2005

Document type > *Article de revue

Keywords > heterogeneous contamination, Monte Carlo, numerical phantom, uncertainties

Research Unit > IRSN/DRPH/SDI/LEDI

Authors > DE CARLAN Loïc, FRANCK Didier, PIERRAT Noëlle

Publication Date > 01/09/2005

Summary

In vivo lung counting is one of the preferred methods for the monitoring of nuclear workers exposed to a risk of internal contamination. Some difficulties are still encountered while using this technique, mainly due to calibration conditions, leading to large uncertainties and important systematic errors on results. Indeed, the use of physical calibration phantoms remains a limiting factor and generates large corrections for the extrapolation to a given subject. A promising perspective for decreasing systematic errors is based on a subject-specific calibration method using numerical phantoms. In this context, an interface called OEDIPE (French acronym for "tool for internal personalized dose assessment"), associating numerical voxel phantoms and Monte Carlo calculation (MCNP), was developed in the laboratory. The purpose of this work is to show the potential of this technique for the realistic simulation of in vivo lung measurement of actinides. After the presentation of the OEDIPE software for lung measurement, its validation will be presented using a calibration phantom currently used (Livermore phantom). Then a comparison between different thoracic calibration phantoms and a numerical phantom of a person (Zubal phantom) was made in order to show calibration variations generated by morphological differences of these phantoms and thus to prove the necessity of a more specific calibration for a given subject. Finally, approaches of heterogeneous contaminations were realized to show the interest of the technique for the study of the variations of calibration factors according to the distribution of radionuclides in lungs. All results show the power of the technique for realistic calibration of in vivo systems


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