Abstract
A method has been devised for the correction of distortion effects arising from finite detector resolution in the measurement of continuous beta spectra. The correction procedure can, in principle, be used to correct distortions of any continuous spectrum measured with any spectrometer having a line-shape of fair resolution which can be measured or calculated. The method was applied to beta spectra measured with a 4 π scintillation spectrometer. Internal conversion lines were used to determine the basic line-shape of the instrument, which was found to be Gaussian to a very good approximation. The beta spectra of two elements, Tl 204 and Y 91, which have unique forbidden shapes were measured and corrected assuming the basic line-shape to be Gaussian. The correction procedure yields results compatible with the Fermi theory, and the experimental shape factor plots for these continuous beta ray spectra are in good agreement with theoretical unique shape factors.
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