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Analytical use of alpha-source induced gamma-ray emission

Analytische Anwendung der α-induziertcn γ-Emission

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Zusammenfassung

Eine zerstörungsfreie Multielement-methode, die auf Kernreaktionen und Coulombanregung induziert durch α-Quellen beruht, sowie die Messung prompter γ-Strahlung werden beschrieben. Die Methode eignet sich für leichte und mittelschwere Elemente und ist besonders empfindlich bei leichten Elementen. Der für Promptmessungen notwendige experimentelle Aufbau ist recht einfach. Die Empfindlichkeit der Methode bei Benutzung eines 0,34 mCi starken 241Am-Präparats wird für die leichten Elemente Li, Be, F und Na diskutiert. Der Einfluß von Probengröße, Luftdruck usw. auf die Ausbeute eines dicken Targets wurde untersucht. Monte-Carlo-Rechnungen wurden ausgeführt, um die Modifizierung der isotropen Abstrahlung der Quelle durch deren Schutzabdeckung zu studieren und um den mittleren Energieverlust zu erhalten. Eine Li-Bestimmung in einigen Mineralen wurde durchgeführt.

Summary

A non-destructive multi-element method based on nuclear reactions and Coulomb excitation induced by alpha-sources and the measurement of prompt gamma-rays is described. The method is suitable for light and medium Z elements and is particularly sensitive to light elements. The experimental set-up necessary for the prompt measurements is quite simple. With 0.34 mCi 241Am source, the sensitivity of the method is discussed for the light elements Li, Be, F and Na. The influence of sample size, air pressure etc. on the thick target yield has been investigated. Monte-Carlo calculations have been performed to study the modification of the isotropic behaviour of the alpha-source due to the protective covering and to calculate the average energy loss. The lithium determination in some minerals has been carried out.

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Authors and Affiliations

  1. Arbeitsgruppe Kernphysik, Max-Planck-Institut für Chemie, D-6500, Mainz, Federal Republic of Germany

    Chaturvedula S. Sastri & Karl P. Schelhaas

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  1. Chaturvedula S. Sastri
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  2. Karl P. Schelhaas
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Sastri, C.S., Schelhaas, K.P. Analytical use of alpha-source induced gamma-ray emission. Z. Anal. Chem. 321, 739–747 (1982). https://doi.org/10.1007/BF00466944

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  • DOI: https://doi.org/10.1007/BF00466944

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