Grau Carles A, Kossert K, Grau Malonda A. Determination of the shape factor of (90)Sr by means of the cutoff energy yield method.
Appl Radiat Isot 2008;
66:1021-5. [PMID:
18356061 DOI:
10.1016/j.apradiso.2008.02.049]
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Abstract
Usually, Kurie plots are used to analyze beta-spectra shape-factor functions measured by means of semiconductor and magnetic spectrometers. A drawback of these techniques is the occurrence of self-absorption within the samples through which the emission spectrum is altered. In liquid-scintillation samples self-absorption does not occur, but the poor energy resolution makes the analysis of the spectra difficult. To overcome this problem, two resolution-invariant observables are used for determining the shape-factor function of (90)Sr: (1) the maximum point energy and (2) the cutoff energy yield. The measured shape-factor function of (90)Sr agrees with the one which is predicted by theory for the first-forbidden unique transition.
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