Das spektrum der inneren bremsstrahlung beim β-zerfall von 90Y und 90Sr
1967; Elsevier BV; Volume: 92; Issue: 3 Linguagem: Inglês
10.1016/0375-9474(67)90632-x
ISSN1873-1554
AutoresJ.K. Bienlein, G. Graf, W. Kreische, W. Lampert, G. Loos,
Tópico(s)Nuclear Physics and Applications
ResumoThe spectra of internal bremsstrahlung from the beta decays of 90Y and 90Sr have been measured absolutely with a scintillation spectrometer. The spectra are corrected for external bremsstrahlung, for efficiency in the NaI(Tl) crystal, for absorption in the crystal mounting and for pile-up. The absolute beta activity was determined by measurements with a 4π-scintillator and by measurements with well defined geometry. The results are compared with theoretical calculations of Knipp, Uhlenbeck and Bloch, of Lewis and Ford and of Felsner and Gebhardt. For 90Y the results are for lower energies (≦ 500 keV) in agreement with Knipp et al. For higher energies, they are better represented by Felsner and Gebhardt. For 90Sr the results agree with Felsner and Gebhardt for lower energies (≦ 200 keV). For higher energies they lie higher than those calculations. The beta decay of 90Y→90Zr was observed over more than 16 half-lives. The lifetime was found to be T12 = 64.6±0.8 h.
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