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  • 1 The Jikei University School of Medicine Radioisotope Research Center 3-25-8, Nishishimbashi, Minato-ku Tokyo (Japan)
  • 2 Tokyo Medical and Dental University Department of Radiology, School of Medicine 1-15-45, Yushima, Bunkyo-ku Tokyo (Japan)
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Abstract  

Multiple radionuclide mixtures which have similar scintillation pulse height distributions can be accurately radioassayed by the most probable value theory. This liquid scintillation technique is based on the construction of more observation equations than the number of nuclides to be analyzed. The technique has been applied to3H–14C–125I and3H–14C–51Cr mixture samples, and found to be very practicable with the aid of computerized data processing for mixture samples having a wide range (ca. 10 times) of activity ratios.