To confirm the applicability of the modified integral counting method for the radioactivity measurements of low energy beta emitters, the radioactivity measurements of 35S and 14C were carried out using a liquid scintillation counter. The disintegration rates of 35S and 14C were evaluated from the liquid scintillation spectra by the modified integral counting method. The disintegration rates thus obtained sufficiently supported the applicability of this method to the radioactivity measurement by liquid scintillation counting without using quenched standards. Discussion was also given concerning the measurement procedures involving the modified integral counting method.
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