Contribution à l'étude de la luminescence de l'air sous irradiation alpha par des mesures de temps de décroissance PDF Download

Author: Françoise Du Chaffaut
Publisher:
ISBN:
Category :
Languages : fr
Pages : 100

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Author: Françoise du Chaffaut
Publisher:
ISBN:
Category :
Languages : fr
Pages : 100

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Author: ABDALKARIM.. ABBAS
Publisher:
ISBN:
Category :
Languages : fr
Pages : 155

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Book Description
L'OBJET DE CETTE ETUDE A ETE DE CARACTERISER LES EFFETS DE L'IRRADIATION ALPHA SUR LES VERRES NUCLEAIRES. NOUS AVONS SUIVI UNE DOUBLE APPROCHE, PAR L'EXPERIENCE ET PAR LA SIMULATION NUMERIQUE. LA STRUCTURE DU VERRE NUCLEAIRE FRANCAIS, R7T7, A ETE SIMULEE EN UTILISANT DES VERRES A 4 ET 6 OXYDES CONTENANT LES PRINCIPAUX ELEMENTS DE CE VERRE : SIO 2, B 2O 3, NA 2O, ZRO 2, AL 2O 3 ET CAO. CES VERRES ONT ETE IRRADIES AUX IONS HE + DE 1 MEV (PROCESSUS ELECTRONIQUES) ET KR 3 + DE 2,1 MEV (PROCESSUS ELECTRONIQUES ET BALISTIQUES), CE QUI NOUS A PERMIS DE REPRODUIRE A LA FOIS LES EFFETS DE LA PARTICULE ALPHA ET DU NOYAU DE RECUL EMIS LORS DE LA DESINTEGRATION DES ACTINIDES, MAIS AUSSI DE DIFFERENCIER LES EFFETS CAUSES PAR LES PROCESSUS ELECTRONIQUES ET BALISTIQUES. LES VERRES AINSI IRRADIES ONT ETE CARACTERISES PAR DIFFERENTES METHODES, CE QUI A ETE L'OCCASION D'ADAPTER LES PROTOCOLES EXPERIMENTAUX AUX CARACTERISTIQUES SPECIFIQUES DE NOS ECHANTILLONS (ECHANTILLONS DE PETITE TAILLE TRES ISOLANTS, FAIBLE PROFONDEUR IRRADIEE). LES RESULTATS METTENT EN AVANT LE ROLE PARTICULIER DU SODIUM (ELEMENT LE PLUS MOBILE) : ACCUMULATION DE SODIUM A LA SURFACE OBSERVEE PAR SPECTROSCOPIE RUTHERFORD, ACCELERATION APPARENTE DU RELACHEMENT DE SODIUM PAR LIXIVIATION COHERENTE AVEC LES RESULTATS PRECEDENTS. LES SPECTRES RAMAN MONTRENT UNE AUGMENTATION DE LA POLYMERISATION DU VERRE APRES IRRADIATION S'EXPLIQUANT PAR LA MIGRATION DU SODIUM. NOUS RETROUVONS L'EVOLUTION SOUS IRRADIATION DES GRANDEURS MECANIQUES OBSERVEES SUR LES VERRES NUCLEAIRES DOPES (LA DURETE DIMINUE, LA TENACITE AUGMENTE). PARALLELEMENT A CE TRAVAIL EXPERIMENTAL, NOUS AVONS REALISE DES SIMULATIONS PAR DYNAMIQUE MOLECULAIRE D'UN VERRE A 6 OXYDES. NOUS AVONS MONTRE QUE LA PRESENCE DE LA SURFACE INDUIT DES MODIFICATIONS DE LA STRUCTURE SE LIMITANT A 10 A : MODIFICATION DES PROFILS DE CONCENTRATION, DIMINUTION DE LA COORDINENCE (AL, B ET SI). LORS DES CASCADES DE CHOCS BALISTIQUES, IL APPARAIT QUE LES DEPLACEMENTS ATOMIQUES SONT PLUS FACILES PRES DES SURFACES, COMPORTEMENT OBSERVE EGALEMENT LORS DE L'APPLICATION D'UN CHAMP ELECTRIQUE EXTERNE. DANS LA GAMME D'ENERGIE ETUDIEE, L'EFFICACITE DE LA RECONSTRUCTION DE LA STRUCTURE VITREUSE NE SEMBLE PAS AFFECTEE PAR LA PRESENCE DE LA SURFACE.

Author: Georges Massé (auteur d'une thèse de sciences.)
Publisher:
ISBN:
Category :
Languages : fr
Pages : 344

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Author: Alain Barbu (auteur d'une thèse de sciences.)
Publisher:
ISBN:
Category :
Languages : fr
Pages :

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Author: Julien Borgnino
Publisher:
ISBN:
Category :
Languages : fr
Pages : 112

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Author: Aubri Capri Buchanan
Publisher:
ISBN:
Category : Alpha rays
Languages : en
Pages : 592

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Author: Bernard Valeur
Publisher: Springer Science & Business Media
ISBN: 364256853X
Category : Science
Languages : en
Pages : 496

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Book Description
This first volume in the new Springer Series on Fluorescence brings together fundamental and applied research from this highly interdisciplinary and field, ranging from chemistry and physics to biology and medicine. Special attention is given to supramolecular systems, sensor applications, confocal microscopy and protein-protein interactions. This carefully edited collection of articles is an invaluable tool for practitioners and novices.

Author: L. Boetter-Jensen
Publisher: Elsevier
ISBN: 008053807X
Category : Science
Languages : en
Pages : 375

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Optically Stimulated Luminescence (OSL) has become the technique of choice for many areas of radiation dosimetry. The technique is finding widespread application in a variety of radiation dosimetry fields, including personal monitoring, environmental monitoring, retrospective dosimetry (including geological dating and accident dosimetry), space dosimetry, and many more. In this book we have attempted to synthesize the major advances in the field, covering both fundamental understanding and the many applications. The latter serve to demonstrate the success and popularity of OSL as a dosimetry method.The book is designed for researchers and radiation dosimetry practitioners alike. It delves into the detailed theory of the process from the point of view of stimulated relaxation phenomena, describing the energy storage and release processes phenomenologically and developing detailed mathematical descriptions to enable a quantitative understanding of the observed phenomena. The various stimulation modes (continuous wave, pulsed, or linear modulation) are introduced and compared. The properties of the most important synthetic OSL materials beginning with the dominant carbon-doped Al2O3, and moving through discussions of other, less-well studied but nevertheless important, or potentially important, materials. The OSL properties of the two most important natural OSL dosimetry material types, namely quartz and feldspars are discussed in depth. The applications chapters deal with the use of OSL in personal, environmental, medical and UV dosimetry, geological dating and retrospective dosimetry (accident dosimetry and dating). Finally the developments in instrumentation that have occurred over the past decade or more are described. The book will find use in those laboratories within academia, national institutes and the private sector where research and applications in radiation dosimetry using luminescence are being conducted. Potential readers include personnel involved in radiation protection practice and research, hospitals, nuclear power stations, radiation clean-up and remediation, food irradiation and materials processing, security monitoring, geological and archaeological dating, luminescence studies of minerals, etc.

Author: Tibor J. Dunai
Publisher: Cambridge University Press
ISBN: 1139487183
Category : Science
Languages : en
Pages : 199

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This is the first book to provide a comprehensive and state-of-the-art introduction to the novel and fast-evolving topic of in-situ produced cosmogenic nuclides. It presents an accessible introduction to the theoretical foundations, with explanations of relevant concepts starting at a basic level and building in sophistication. It incorporates, and draws on, methodological discussions and advances achieved within the international CRONUS (Cosmic-Ray Produced Nuclide Systematics) networks. Practical aspects such as sampling, analytical methods and data-interpretation are discussed in detail and an essential sampling checklist is provided. The full range of cosmogenic isotopes is covered and a wide spectrum of in-situ applications are described and illustrated with specific and generic examples of exposure dating, burial dating, erosion and uplift rates, and process model verification. Graduate students and experienced practitioners will find this book a vital source of information on the background concepts and practical applications in geomorphology, geography, soil-science, and geology.