Abstract：The scintillation counter (SC) is a commonly used detector for the wavelength dispersive X-ray fluorescence spectrometer (WDXRF). Compared with the traditional scintillation counters, by trial and error, 100μm Be sheet was used as the shielding material to integrate with the scintillator. Meanwhile, the quartz glass was selected as the packaging material of NaI crystal. It improved the packaging technology of NaI crystals, realizing the good sealing of NaI crystals and enhancing the detection efficiency of the detector. Through the customized selection of electronic components, the weak signal output from the scintillation counter was effectively extracted and amplified, which improved the energy resolution of the detector. The digital adjustable signal amplification technology was used to achieve the continuously adjustable amplification of the anode pulse signal, and the detection range of the detector was increased. The obtained scintillation counter was used for a sequential wavelength dispersive X-ray fluorescence spectrometer. The precision, stability and detector resolution experiments were performed on the whole machine according to the national metrological verification regulations JJG 810-1993. The results showed that: the precision index of the count value of CuKα was 0.078% for the pure copper billet sample; the stability index of the count value of NiKα was 0.238% for the chromium nickel stainless steel sample; the energy resolution index of detector was 39.73%. All these indexes could meet the A-level requirements in this verification regulation.
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