α/β radiation detector using wavelength and delayed fluorescence discrimination

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 480; no. 2; pp. 626 - 635
• Main Authors: Maekawa, T, Sumita, A
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 21.03.2002
• Subjects: Delayed fluorescence; Dust radiation monitor; Radiation discrimination; Wavelength; YOS(Eu); α/β simultaneous counting; YOS(Eu); Radiation detector: 07.57.k; Delayed fluorescence; Radiation discrimination; 29.40; 85.25.p; Detector scintillator: 29.40.m; Dust radiation monitor; Wavelength; α/β simultaneous counting
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/S0168-9002(01)01106-8

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 Y 2O 2S(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 Y 2O 2S(Eu) in the signal processing. We manufactured 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.