Abstract：The flow-gas proportional counter (F-PC) is the common detector for wavelength dispersive X-ray fluorescence spectrometer (WDXRF). For the conventional F-PC, 1-6μm aluminum-coated polypropylene film was usually employed as the window. The simulation operational amplifier was used for signal amplification. It has some problems such as low transmittance of X-ray, poor durability of window and nonadjustable signal amplification factor. A kind of F-PC which could be used in vacuum was developed based on 0.6μm aluminum-coated polypropylene film with metal grid support and digital adjustable signal amplification technique. The transmittance of X-ray and durability of film were improved, realizing the continuous adjustment of amplification of anode pulse signal. The developed F-PC was applied for sequential wavelength dispersive X-ray fluorescence spectrometer. The precision, stability of instrument and resolution of detector were investigated according to the national metrology verification regulation JJG 810-1993. The precision test indicated that the relative standard deviation (RSD, n=20) of AlKα count value in pure aluminum sample was 0.086%. The stability test indicated that the relative range (n=400) of NiKα count value in chromium nickel stainless steel sample was 0.193%. The energy resolution (R) of F-PC calculated by pure aluminum sample was 39.03%. The results above could meet A-level index requirement in verification regulation.
周超, 宋春苗, 胡学强. 一种用于波长色散X射线荧光光谱仪的流气式正比计数器的研制[J]. 冶金分析, 2019, 39(10): 14-17.
ZHOU Chao, SONG Chun-miao, HU Xue-qiang. Development of a flow-gas proportional counter for wavelength dispersive X-ray fluorescence spectrometer. , 2019, 39(10): 14-17.
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