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首页> 外文期刊>Nuclear Instruments & Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment >Organic scintillator-based alpha/beta detector for radiological decontamination
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Organic scintillator-based alpha/beta detector for radiological decontamination

机译：基于有机闪烁体的α/β探测器，用于放射性净化

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摘要

A detector that can distinguish alpha from beta particles is valuable for detecting alpha emitters from contamination at and around the Fukushima Daiichi Nuclear Power Plant (FDNPP), and other nuclear facility decontamination sites. We developed a prototype alpha/beta particle detector using a pulse shape discrimination (PSD) capable organic scintillator, a silicon photomultiplier, and a waveform digitizer. The charge integration PSD technique was used to separate alpha and beta particles. We compared the PSD figure of merit (FOM) values of two scintillators (EJ-299-33 and stilbene), and found that the stilbene (FOM = 1.61) performance was superior to the EJ-299-33 (FOM = 0.56) performance, measured using an Am-241 source (5.5 MeV alpha particle emission) and a Sr-90 source. Additionally, the stilbene showed good energy resolution (23.6 %FWHM for 5.5 MeV alpha particles). In the pulse height spectrum for the Sr-90/Y-90 source, the lower energy portion (Sr-90) and the higher energy portion (Y-90) could be separated. To demonstrate the detector's separation ability, the Th-232 source was measured. The measurements demonstrated the alpha and beta particle separation, and alpha and beta spectra were obtained simultaneously, which was not possible when using commercial detectors such as a ZnS(Ag) scintillation detector.
机译：可以从β粒子区分α的探测器对于检测福岛Daiichi核电站（FDNPP）和其他核设施净化位点的污染物检测α发射器。我们使用脉冲形状辨别（PSD）有机闪烁体，硅光电倍增器和波形数字转换器开发了原型α/β粒子检测器。电荷积分PSD技术用于分离α和β颗粒。我们比较了两个闪烁体（EJ-299-33和斯蒂烯）的PSD优点（FOM）值的PSD数字，并发现斯蒂烯（FOM = 1.61）性能优于EJ-299-33（FOM = 0.56）性能，使用AM-241源（5.5meVα粒子发射）和SR-90源测量。此外，斯蒂烯显示出良好的能量分辨率（23.6％FWHM，5.5meVα颗粒）。在SR-90 / Y-90源的脉冲高度频谱中，可以分离下能量部分（SR-90）和更高的能量部分（Y-90）。为了证明探测器的分离能力，测量TH-232源。测量表明α和β颗粒分离，同时获得α和β光谱，当使用诸如ZnS（Ag）闪烁检测器的商业检测器时，不可能。

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