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2. 发明授权

US4573181A X-Ray fluorescence analyzers 失效
标题翻译： X射线荧光分析仪
公开(公告)号：US4573181A
公开(公告)日：1986-02-25
申请号：US455842
申请日：1983-01-05
申请人： Thomas Gronberg , Torsten Almen , Klaes Golman , Soren Mattsson , Staffan Sjoberg
发明人： Thomas Gronberg , Torsten Almen , Klaes Golman , Soren Mattsson , Staffan Sjoberg
IPC分类号： G01N23/223 , H01J37/252 , G01N23/22
CPC分类号： G01N23/223 , G01N2223/076
摘要： An apparatus for determining the content of an element having an atomic number higher than 47, in a sample volume, in particular for determining the concentration of an X-ray contrast agent in vivo, employs a radiation source for such excitation of the element in the sample volume with collimated radiation that the element emits its characteristic X-ray radiation. An NaI(T1) scintillation detector is directed towards the sample volume for receiving X-ray radiation therefrom at an angle of from 90.degree. to 135.degree. in relation to the excitation radiation. Both the energy of Copton-scattered photons in the sample and the difference between this energy and 28.5 KeV must be clearly distinguished from the characteristic energy of the element concerned. A first single-channel analyzer registers the number of pulses of the detector within a predetermined energy interval about the energy value for the characteristic X-ray radiation of the element concerned, and two further single-channel analyzers register the number of pulses at the limits of the interval mentioned. A calculating unit in the form of computer determines the background radiation in the interval mentioned using the two latter pulse numbers, and determines the content of the element concerned from the difference between the pulse number of the first analyzer and the pulse number representing the background radiation.
摘要翻译：用于确定样品体积中具有高于47的原子序数的元素的含量的装置，特别是用于确定体内X射线造影剂的浓度的装置，采用这种激发元素的辐射源具有准直辐射的样品体积，该元件发射其特征X射线辐射。 NaI（T1）闪烁检测器指向样品体积，以相对于激发辐射以90°至135°的角度从其接收X射线辐射。样品中康普顿散射光子的能量和该能量与28.5KeV之间的差异必须与相关元件的特征能量明确区分开。第一个单通道分析仪将关于有关元件的特征X射线辐射的能量值的检测器的脉冲数量记录在预定的能量间隔内，另外两个单通道分析器将限制的脉冲数的间隔时间。以计算机形式的计算单元确定使用后两个脉冲数的所述间隔中的背景辐射，并且根据第一分析仪的脉冲数与表示背景辐射的脉冲数之间的差确定相关元素的内容。

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