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The beta-ray spectra of Ra E and P³² were obtained by means of a magnetic spectrometer of high resolution. The observed end points of the spectra of Ra E and P³² are at 5280±{}20 H_ρ (1.15 Mev) and 7150±{}100 H_ρ (1.69 Mev), respectively. The end points obtained by extrapolating the Konopinski-Uhlenbeck plots are in each case about 17 percent greater than the observed ones, indicating that for some spectra these plots should not be used to determine the upper limits.
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E. M. Lyman (1937) studied this question.
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