par Begemann, Friedrich;Buttlar, H.v.;Houtermans, F.G. F.G.;Isaac, N.;Picciotto, Edgardo 
Référence Geochimica et cosmochimica acta, 4, 1-2, page (21-35)
Publication Publié, 1953-08
Référence Geochimica et cosmochimica acta, 4, 1-2, page (21-35)
Publication Publié, 1953-08
Article révisé par les pairs
| Résumé : | The RaD method suggested by F. G. Houtermans for the determination of the "chemical" age of uranium minerals consists in the measurement of Pb/U, from the ratio RaD/Pb. Since RaD is an isotope of lead, this ratio can be determined on any quantity of lead from the mineral. In this way the quantitative analyses of uranium and lead are avoided. The determination can be carried out on an extremely small quantity of matter. The conditions under which the method is applicable, and the ways of measuring RaD, are discussed. A confirmation has been obtained with two samples of pitchblende from Shinkolobwe: the ratio Pb/U was determined on the one hand by chemical analysis, and on the other by the RaD method. All the measurements of the two methods were carried out independently at the second Physical Institute of the University of Gottingen, and at the Centre de Physique Nucléaire de l'Université Libre de Bruxelles. One method of lead determination by dithizone extraction and polarography is described in detail. The technique of measuring the RaD by counting the beta particles of RaE was perfected. The ratios Pb/U determined by the two methods agree within the experimental errors. The advantages of the RaD method are summarized in the conclusion. © 1953. |
