A realistic solution of overcoming disadvantage of Compton suppression spectrometer.

To achieve low detection limits for radionuclide analysis, Compton continuum suppression gamma-ray spectrometer has been used for several decades. The most serious disadvantage arises when radionuclides measured have cascade gamma emissions. This is a major limitation of the technique in environmental sample analysis. The digital list-mode data acquisition techniques in conjunction with time stamped pulse analysis method presented in this paper recovers the undesired full-energy-peak (FEP) coincidence losses for cascade radionuclides while retains suppression of true Compton events to keep the improved detection limit, thus extending the usefulness of the anti-Compton spectroscopy. In this study, software are developed to analyse the radionuclides with a relative simple decay scheme, such as 22Na, 60Co and 88Y, and a complex decay scheme, such as 125Sb, 134Cs, 152Eu and 154Eu. The results indicated that in the reconstruct anticoincidence spectra the FEP restoration efficiency, both for minor and major peaks, is near 100%.