Innovation of radioactive nuclide determination by the SDM method

Oshima, Masumi*; Hayakawa, Takehito*; Asai, Masato  ; Goto, Jun*; Shinohara, Hirofumi*

We have developed an innovative method named "spectral determination method (SDM method)" to analyze radiation spectra containing a number of radioactive isotopes with better accuracy than that of conventional analysis methods. We applied this method to -ray spectra measured with Ge detectors or scintillation detectors, -particle spectra measured with liquid scintillation counters, and - coincidence spectra. Furthermore, we found that the accuracy of the analysis results was much improved by unifying all these spectra and applying the SDM method to those unified spectra.