α/β radiation detector using wavelength and delayed fluorescence discrimination

This paper describes a novel two-layer radiation detector for α/β simultaneous counting for dust radiation monitoring in nuclear power plants. For α/β discrimination, wavelength and delayed fluorescence discrimination techniques were newly developed. To establish the wavelength discrimination, we adopted a two-layer scintillator consisting of the plastic scintillator (NE-111A) and Y2O2S(Eu) whose emission spectra are quite different. To reject the mixed β signal in the α detection layer, we used the delayed fluorescence characteristics of Y2O2S(Eu) in the signal processing. ufactured the detector and tested its feasibility and the detection performance for dust radiation monitoring. Finally, we concluded that the performance of this new α/β detector using the new discrimination methods is suitable for dust radiation monitoring.