Enhanced radioisotope identification via dual-spectrum analysis using scintillation detectors

Accurate identification of radionuclides in complex mixtures is often hindered by spectral overlap, particularly when using low-resolution detectors. This study presents an enhanced approach that simultaneously utilizes beta and gamma spectra acquired from a dual-detector setup consisting of a plastic scintillator and a NaI(Tl) crystal. Rather than relying solely on gamma peaks, the method incorporates the full beta spectrum as complementary information to improve isotopic separation, especially for radionuclides with closely spaced gamma emissions. Simulated scenarios involving Cs-134 and Cs-137 demonstrate that adding beta data reduces identification error and improves source discrimination. This dual-spectrum strategy offers a practical solution for improving radioisotope identification in portable detection systems used in nuclear safety and environmental monitoring.