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Sulla radioattività del potassio

Riassunto

Dopo una rassegna dei principali risultati oggi (lisponibili sulla radioattività del Potassio viene descritta una iiuova esperienza per la determinazione, del rapporto λK- fra le costanti di trasformazione per cattiiraK e per emissione Β-. I raggi Β (primari) ed i raggi X (secondari alia catturaK) emessi da un sottile strato cilindrico di KF, vengono rivelati da un contatore di G. e M. coassiale collo strato. I raggi β si possono escludere dalla misura con un campo magnetioc longitudinale, i raggi X con un assorbitore mobile in foglia d’Al. Dalle differenze osservate si deduce che λK/gl- ≲ 0,1.

Summary

Recent work on the radioactivity of K40 is discussed. Then a new experimental determination of the ratio λK- between the decay constants through K-capture and Β-emission is described. The Β- and X-rays (the latter resulting from the K-capture) emitted by a thin cilindrical layer of KF are counted in a coaxial G.M. counter, Β- and X-rays can be prevented from reaching the counter by the insertion of a magnetic field, respectively of an aluminium foil absorber, in the space between the counter and the KF layer. From the observed difference we deduce λK-0,1.

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Correspondence to M. Ceccarelli.

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Ceccarelli, M., Quareni, G. & Rostagni, A. Sulla radioattività del potassio. Nuovo Cim 8, 132–143 (1951). https://doi.org/10.1007/BF02773049

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