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Comparison of three commonly used x fluorescence spectrometer detectors

Release time: 2020-01-02 14:19:14 Click: 456

X 射线探测器的作用是将 X 射线光子的能量转换成易于测量的电信号。 The detector of the X -ray fluorescence spectrometer is an important device for analysis. The function of the X - ray detector is to convert the energy of X -ray photons into an electrical signal that can be easily measured. Due to the different performances of the detectors, multiple factors need to be taken into consideration when selecting detectors.

Good detectors not only need to have high resolution and high count rate, but also need a wide range of elemental analysis and effective active area. X 射线探器而言,产生一个离子对的平均能量,在 Si(Li) 探测器、流气式正比计数器、闪烁计数器之间大约相差一个量级,而分辨率与一个光子产生的电子数的平方根成正比,故三者之间的分辨率也粗略相差三倍。 Its application field and use environment are also one of the focuses that need to be paid attention to. The wavelength color and energy dispersion ability are determined by the number of equivalent ion pairs generated by the incident photon in the detector and proportional to the incident photon energy. Inversely, for the three commonly used X -ray detectors, the average energy of generating an ion pair is about an order of magnitude different between the Si (Li) detector, the gas flow proportional counter, and the scintillation counter. The square root of the number of electrons generated by a photon is directly proportional, so the resolution between the three is roughly three times different.

三种常用x荧光光谱仪探测器对比

Comparison of three commonly used x fluorescence spectrometer detectors

Gas flow proportional counter

X 射线光谱仪,尽管曾经有一段时期流行用封闭式气体正比计数管作为现场分析仪,但由于分辨率太低,再加上温差电冷能量探测器的广泛采用,仅采用封闭式气体正比计数管的现场 X 射线分析仪在国际上已基本淘汰。 The gas flow proportional counter is mainly used for light element analysis, and the scintillation counter is used for heavy element determination. Due to the low resolution, these two detectors must be used together with the spectroscopic crystal to obtain good spectral line resolution, so they are mainly used for wavelength Dispersive X -ray spectrometers, although closed gas proportional counting tubes were popular as field analyzers for some time, but because the resolution is too low, coupled with the widespread use of temperature difference electric cooling energy detectors, only closed gas proportional counting is used. The on-site X -ray analyzer of the tube has basically been eliminated internationally.

Si (Li) detector

X 射线光谱仪,就能量探测器而言, Si(Li) Si-PIN 、高纯 Ge(HPGe) 探测器已得到广泛使用, SDD CDD 等则主要应用于获取成分及多维信息。 Si (Li) detectors are currently mainly used in energy dispersive X -ray spectrometers. As for energy detectors, Si (Li) , Si-PIN , and high-purity Ge (HPGe) detectors have been widely used. SDD , CDD, etc. It is mainly used to obtain composition and multi-dimensional information. Si(Li) 探测器等没有增益,故需要前置放大器。 Since Si (Li) detectors have no gain, a preamplifier is required.

At present, the resolution and counting rate of energy detectors have reached practical levels, and some types of energy resolution have even reached the theoretical limit. It should be noted that with different collimators, the resulting resolution will vary.

X 射线光谱仪由于使用分光晶体而达到约 12eV 的分辨率,但最新的能量探测器已可达到 4eV ,在分辨率方面己取得优势。 Although the wavelength-dispersive X -ray spectrometer achieves a resolution of about 12 eV due to the use of a spectroscopic crystal , the latest energy detectors can already reach 4 eV , which has achieved an advantage in resolution. X 射线光谱仪,波长色散与能量色散在 X 射线光谱仪中的份额已发生明显变化,能量色散 X 射线光谱仪的比重显著增加。 At present, many manufacturers have launched successful energy dispersive X - ray spectrometers. The proportion of wavelength dispersion and energy dispersion in X -ray spectrometers has changed significantly, and the proportion of energy-dispersive X -ray spectrometers has increased significantly. X 射线光仅有可能在未来逐步取代复杂的波长色散 X 射线光谱仪系统,成为 X 射线荧光光谱分析领域的主流。 In fact, if the new energy detector can make breakthroughs in the counting rate and the stability of the manufacturing process, energy-dispersive X -ray light can only gradually replace the complex wavelength-dispersive X -ray spectrometer system in the future and become X -ray fluorescence spectrum analysis. The mainstream of the field.

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