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Etalonnage d'un spectromètre gamma en vue de la mesure de la radioactivité naturelle. Mesures expérimentales et modélisation par techniques de Monte-Carlo

Abstract : The thesis proceeded in the context of dating by thermoluminescence. This method requires laboratory measurements of the natural radioactivity. For that purpose, we have been using a germanium spectrometer. To refine the calibration of this one, we modelled it by using a Monte-Carlo computer code: Geant4. We developed a geometrical model which takes into account the presence of inactive zones and zones of poor charge-collection within the germanium crystal. The parameters of the model were adjusted by comparison with experimental results obtained with a source of 137^Cs. It appeared that the form of the inactive zones is less simple than is presented in the specialized literature. This model was widened to the case of a more complex source, with cascade effect and angular correlations between photons: the 60^Co. Lastly, applied to extended sources, it gave correct results and allowed us to validate the simulation of matrix effect.
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https://tel.archives-ouvertes.fr/tel-00147301
Contributor : Jeanine Pellet <>
Submitted on : Wednesday, May 16, 2007 - 3:05:19 PM
Last modification on : Thursday, February 25, 2021 - 10:58:20 AM
Long-term archiving on: : Wednesday, April 7, 2010 - 3:38:00 AM

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  • HAL Id : tel-00147301, version 1

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F. Courtine. Etalonnage d'un spectromètre gamma en vue de la mesure de la radioactivité naturelle. Mesures expérimentales et modélisation par techniques de Monte-Carlo. Physique [physics]. Université Blaise Pascal - Clermont-Ferrand II, 2007. Français. ⟨tel-00147301⟩

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