Spectroscopy and Spectral Analysis, Volume. 41, Issue 11, 3493(2021)
A Method Quickly to Measure the Size of the Confocal Volume of Confocal X-Ray Instrument
Confocal X-ray fluorescence is a directly non-destructive analysis technique with spatial resolution, widely used in materials, biology, mineral sample analysis, archaeology, evidence traceability and other fields. The confocal X-ray fluorescence spectrometer work is based on a polycapillary X-ray lens. A polycapillary focusing X-ray lens (PFXRL) attached to the X-ray tube is used to focus the divergent X-ray from the X-ray tube to the output focal spot with dozens of micron diameter and high power density gain. A polycapillary parallel X-ray lens (PPXRL) with an input focal spot placed on the front of the silicon drift detector is used to receive the fluorescence signal from the specific region. The overlap region of the output focal spot of the PFXRL and the input focal spot of the PPXRL in the confocal X-ray fluorescence spectrometer is called probe volume. Only the sample in the probe volume can be detected. The spatial information of the sample can be obtained by the relative movement of the probe volume and sample point by point. The size of the probe volume determines the spatial resolution of the confocal X-ray fluorescence spectrometer. Thus, it is significant to measure the size of the probe volume. The shape of the probe volume is similar to an ellipsoid. The size of the probe volume can be expressed as the horizontal resolution X, Y and the depth resolution Z, as showni n
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Xue-peng SUN, Xiao-yun ZHANG, Shang-kun SHAO, Ya-bing WANG, Hui-quan LI, Tian-xi SUN. A Method Quickly to Measure the Size of the Confocal Volume of Confocal X-Ray Instrument[J]. Spectroscopy and Spectral Analysis, 2021, 41(11): 3493
Category: Orginal Article
Received: Oct. 23, 2020
Accepted: --
Published Online: Dec. 17, 2021
The Author Email: SUN Xue-peng (1264973580@qq.com)