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Theses

Dosimétrie pour la radioprotection dans des champs de rayonnements X jusqu'à des énergies de 3 MeV

Abstract : The evaluation of the dosimetric protection quantities used to ensure the three principles of the radiation protection is achieved by radiation survey meters. With a proper calibration, which is periodically controlled, these instruments give a dosimetric operational quantity, as the ambient dose equivalent rate H*(10) for example, which represents a good estimator of the effective dose E used to define regulatory ionizing radiation exposition limits for workers.So far before this thesis work, the periodic calibration control of radiation survey meters was achieved only by using radioactive sources, as the 137Cs, which emit mono-energetic gamma rays. Although this method is well known and standardized, it suffers from an energetic representativeness defect. Indeed, the ionizing radiation sources encountered are generally many and the environment enables diffusions which imply a broadened energetic spectrum. But the radiation survey meters are sensitive on large energetic ranges which response is not homogeneous.As part of this thesis work, realized in collaboration between ATRON METROLOGY and the LPC Caen, a calibration and calibration control of radiation survey meters method has been developed, validated and implemented. Broadened energetic X-rays fields, produced by the braking of electrons pre-accelerated by an electrostatic accelerator, are used rather than the mono-energetic gamma rays. This method offers a better representativeness in terms of metrology but is also a sustainable approach allowing to free the use of radioactive sources for calibration and calibration control of radiation survey meters.
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Gabriel Dupont. Dosimétrie pour la radioprotection dans des champs de rayonnements X jusqu'à des énergies de 3 MeV. Physique [physics]. Normandie Université, 2019. Français. ⟨NNT : 2019NORMC231⟩. ⟨tel-02468870⟩

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