Fourier Fitting Interpolation Method and Asym2Sig Method for spectral data

Finally, the logarithmic fitted spectrum of the highest Em nuclide is subtracted from the mixed logarithmic fitted spectrum to obtain the logarithmic fitted spectrum composed of the remaining lower Em nuclides. the above process is iterated in a loop to finally resolve the logarithmic spectra of the nuclides in the original mixed logarithmic spectra, and then calculate the radioactivity of the Em nuclides to be measured. energy spectrum of each nuclide in the original mixed logarithmic energy spectrum, and then calculate the activity of the measured Em nuclide.

In the experimental tests, the 14C, 90Sr, and 90Y spectra obtained through Fourier series fitting interpolation are compared with the original simulated 14C, 90Sr, and 90Y spectra of GEANT4. The measured liquid scintillation data of the 90Sr/90Y sample source and the simulated data of GEANT4 are then analyzed. The analysis of the experimental results indicates that the Fourier series fitting interpolation method accurately solved the 14C, 90Sr and 90Y energy spectra, which were in good agreement with the original GEANT4 simulation.

The error in the 90Y activity calculated using the actual detection efficiency was less than 10%, and less than 5% when using the simulation full-spectrum detection efficiency, meeting the experimental expectations.