Les mesures anthroporadiamétriques dans les basses énergies : évolution technologique et bases des recherches actuelles

Franck, Didier; Carlan, L. de; Berard, P.; Dousse, C.; Pihet, P.; Razafindralambo, N.; Soulie, Rémi

doi:10.1051/radiopro:1997126

Cited by 5 publications

(2 citation statements)

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“…De ce fait, un des problèmes majeurs de la mesure pulmonaire réside dans les incertitudes associées à la mesure des rayonnements (en particulier les photons d'énergie inférieure à 20 keV), liées à l'atténuation, ainsi que dans les erreurs systématiques sur les résultats engendrées par l'utilisation de fantômes physiques (Franck et al, 1997). L'étalonnage est donc un facteur déterminant lors d'une estimation de contamination pulmonaire par actinides.…”

Section: Introductionunclassified

Utilisation des fantômes numériques voxélisés pour l'amélioration des étalonnages en anthroporadiamétrie pulmonaire

2005

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RÉSUMÉL'anthroporadiamétrie pulmonaire est une méthode de choix pour la surveillance des travailleurs de l'industrie nucléaire exposés à un risque de contamination interne. ABSTRACT Use of voxel phantoms for the improvement of lung counting calibrations.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

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Section: Introductionunclassified

Utilisation des fantômes numériques voxélisés pour l'amélioration des étalonnages en anthroporadiamétrie pulmonaire

2005

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“…Actinides (particularly 239Pu) emit low energy x-rays and gamma-rays. Although detection has been improved by the introduction of the high-volume germanium detector, equipment performance results in measurement uncertainties that are still far too high (Franck et al, 1997). Although great efforts have been made to improve the physical phantoms used for calibrating in vivo measurement systems, they actually represent only an approximate geometry and generally only provide for uniform distribution of radioelements in contaminated tissue.…”

Section: Introductionmentioning

confidence: 99%

Development of voxelised numerical phantoms using MCNP Monte Carlo code: Application toin vivomeasurement

et al. 2001

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Although great efforts had been made to improve the physical phantoms used for calibrating in vivo measurement systems, for technical reasons they can oniy provide a rough representation of human tissue. Substantial corrections m w t therefore be made to calibration factors obtained with such caiibration phantoms for extrapolation to a given individuai. These corrections are particularly crucial and delicate in low-energy in vivo measurement when absorption in tissue is significant. To improve caiibration for such special conditions, the posîibility has been raised of using voxelised numerical phantoms associated with Monte Carlo computing techniques. In the method described below, a mathematical phantom, consisting of a voxelised representation derived from scanner images is used, with a specially-designed interface making it possible to not only reconstruct widely-differing contamination confgurations and specify associated tissue compositions, but also automatically create an MCNP4b input file. After validation of the different sources and geometries, the complete procedure of reconstruction of the phantom and simulation of "'Am lung measurement was carried out using a tissue equivalent calibration phantom of the type commoniy used for lung calibration for actinides. The purpose of this work was to extend the use of this principle to the reconstruction of numerical phantoms on the basis of physiological data of individuak obtained from maguetic resonance and scanner images. The resulîs obtained and the current limitations of this approach in the context are discussed. Développement de fantômes numériques voxélisés associé au code Monte Carlo MCNP : application à la mesure anthroporadiamétrique.

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Intercalibration of French Lung Monitoring Systems for Actinide Measurements

Berard¹,

Franck²,

Dubiau³

et al. 2000

Radiation Protection Dosimetry

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Les mesures anthroporadiamétriques dans les basses énergies : évolution technologique et bases des recherches actuelles

Cited by 5 publications

References 11 publications

Utilisation des fantômes numériques voxélisés pour l'amélioration des étalonnages en anthroporadiamétrie pulmonaire

Utilisation des fantômes numériques voxélisés pour l'amélioration des étalonnages en anthroporadiamétrie pulmonaire

Development of voxelised numerical phantoms using MCNP Monte Carlo code: Application toin vivomeasurement

Intercalibration of French Lung Monitoring Systems for Actinide Measurements

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