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  1. No Access

    Article

    Computer assisted multielement analysis of terrestrial and extraterrestrial materials and studies on long-lived cosmogenic53Mn by neutron activation

    In a large number of alpine rocks and respective mineral separates the beryllium distribution was studied via “non-destructive” photon activation. The detection limit of the assembly was ∼20 ppb. The existence...

    A. Büling, C. Carl, P. Englert, U. Herpers, W. Herr… in Journal of Radioanalytical Chemistry (1977)

  2. No Access

    Article

    Determination of227Ac in geological materials through neutron activation and alpha-spectrometric assay of induced228Th

    A new route has been developed for the micro-determination of227Ac in geological materials by neutron activation. The method is based on intense neutron irradiation of the analysed samples followed by separation ...

    H. F. Aly, U. Herpers, W. Herr in Journal of Radioanalytical Chemistry (1975)

  3. No Access

    Article

    A new method for the measurement of spallogenic53Mn by neutron activation

    Des recherches précises sur les noyaux de spallation de longue période et extrémement peu abondants, produits par l'interaction de rayons cosmiques et de matières exposées, sont d'un grand intérêt pour la géo ...

    U. Herpers, R. Wölfle, W. Herr in Journal of Radioanalytical Chemistry (1973)

  4. No Access

    Article

    A neutron activation technique for the isotopic analysis of rhenium in the subnanogram-region

    On applique l'activation neutronique aux mesures d'abondance isotopique du rhénium dans les matériaux lunaires. On y parvient en comparant les activités induites par (n, γ) de186Re et188Re au moyen des raies γ de...

    R. Michel, U. Herpers, H. Kulus, W. Herr in Journal of Radioanalytical Chemistry (1973)