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A Correction Method for Fractionation Effect of Laser Ablation

A calibration method, laser ablation technology, applied in the direction of analyzing materials, material analysis by electromagnetic means, instruments, etc., can solve problems such as the results affecting the dating, changes in Pb/U and Pb/Th of unknown samples, etc., to eliminate fractionation changes. , Reduce the effect of laser ablation fractionation and improve the accuracy

Active Publication Date: 2021-05-28
NANJING UNIV
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Problems solved by technology

In addition, the artificial selection of denudation time during later sample data processing will also cause huge changes in Pb / U and Pb / Th in unknown samples, thereby affecting the dating results

Method used

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  • A Correction Method for Fractionation Effect of Laser Ablation
  • A Correction Method for Fractionation Effect of Laser Ablation
  • A Correction Method for Fractionation Effect of Laser Ablation

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Embodiment

[0060] Step 101: Utilize the PyQt5 code toolkit to write the user interface; call the getExsitingDirectory function of the QFileDialog class of the QtGui package in the PyQt5 tool, under the user interface, the user selects the folder path for storing the original mass spectrometer file and saves the variable, the specific code:

[0061] self.directory = QtGui.QFileDialog.getExistingDirectory(self,'OpenDirectory').

[0062] Take the original mass spectrometer file (*.FIN2) of Thermal Fisher mass spectrometer as an example; call the read_csv function of pandas to read the original mass spectrometer file line by line (remembered as InFile), the nuclide intensity data in the FIN2 file is from the eighth line to the end, Based on this, read the data from the eighth line to the end and identify it as nuclide intensity data for variable storage. The specific code: self.dataFrame=pd.read_csv(self.current_file,skiprows=7).

[0063] In the mass spectrometer parameter data, the second l...

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Abstract

The invention discloses a method for correcting the fractionation effect of laser ablation, which belongs to the technical field of uranium-thorium-lead (U-Th-Pb) ratio data processing of a laser ablation inductively coupled plasma mass spectrometer. In the U‑Th‑Pb dating system, the elemental fractionation effect caused by laser ablation sampling has a great impact on the test values ​​of Pb / U and Pb / Th ratios, and is one of the biggest obstacles that limit the accuracy of sample laser ablation age determination. one. In addition, the artificial selection of denudation time in the post-processing data will also cause huge changes in the Pb / U and Pb / Th of the sample, which will affect the dating results. The present invention is based on the standard-sample cross-test method, provides multiple fitting function types to fit the nuclide ratio data of the standard sample, and after obtaining the function parameters of the fitting function, uses the parameters of the fitting function to correct the sample data deal with. In the corrected mass spectrometer data, the accuracy of Pb / U and Pb / Th ratios is improved, and the influence of artificial selection is greatly reduced, which improves the accuracy of U‑Th‑Pb dating.

Description

technical field [0001] The invention belongs to the technical field of uranium-thorium-lead (U-Th-Pb) ratio data processing of a laser ablation inductively coupled plasma mass spectrometer, and in particular relates to a correction method for a laser ablation fractionation effect. Background technique [0002] In the field of geosciences, laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) has been widely used in U-Th-Pb dating. [0003] During the laser ablation process, the test sample is affected by the thermal effect of laser energy. With the increase of the ablation depth, the volatilization of each nuclide and the formation of aerosol have different ratios, thus affecting the test value of each analyzed nuclide (that is, the laser ablation fractionation effect Downhole Fractionation). In the U-Th-Pb dating system, the elemental fractionation effect caused by laser ablation has a great impact on the test values ​​of Pb / U and Pb / Th ratios, which is on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/62
CPCG01N27/62
Inventor 张莹刚杨涛朱志勇陈永权
Owner NANJING UNIV
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