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Comparison of three commonly used x fluorescence spectrometer detectors

Release time: 2020-01-02 14:19:14 Click: 743

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 role of the X - ray detector is to convert the energy of X -ray photons into an electrical signal that is easy to measure. Due to the different performance of the detector, when selecting the detector, it is necessary to consider a variety of factors.

A good detector not only needs to have high resolution and high count rate, but also needs to have a wide element analysis range 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 key points to be paid attention to. The wavelength color and energy dispersion capabilities are determined by the number of equivalent ion pairs generated by the incident photon in the detector and are proportional to the incident photon energy and the average energy of the generated pair Inversely, as far as the three commonly used X -ray detectors are concerned, the average energy generated by an ion pair differs by approximately an order of magnitude between the Si (Li) detector, gas flow proportional counter, and scintillation counter, and the resolution is 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

Flow-type 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. Because of the low resolution of these two detectors, they must be used with the spectroscopic crystal to obtain good spectral line resolution efficiency, so they are mainly used for Dispersive X -ray spectrometer, although there has been a period of popular closed gas proportional counter tube as a field analyzer, but due to the low resolution, 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 been basically 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. In terms of energy detectors, Si (Li) , Si-PIN , and high-purity Ge (HPGe) detectors have been widely used, and SDD , CDD, etc. Mainly used to obtain ingredients 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, etc. have no gain, a preamplifier is required.

At present, the resolution and count rate of energy detectors have reached practical levels, and some types of energy resolution are even close to 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 detector has reached 4 eV , and has achieved advantages 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 share 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 achieve breakthroughs in count rate and manufacturing process stability, energy-dispersive X -ray light is only likely to gradually replace the complex wavelength-dispersive X -ray spectrometer system in the future and become X -ray fluorescence spectrometry Mainstream in the field.

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