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Laser ablation fractionation effect correcting method

A correction method, laser ablation technology, applied in the analysis of materials, material analysis by electromagnetic means, measurement devices, etc., can solve problems affecting the dating results, changes in Pb/U and Pb/Th in unknown samples, etc.

Active Publication Date: 2019-03-19
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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  • Laser ablation fractionation effect correcting method
  • Laser ablation fractionation effect correcting method
  • Laser ablation fractionation effect correcting method

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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 laser ablation fractionation effect correcting method and belongs to the technical field of U-Th-Pb ratio data processing of laser ablation inductively coupled plasma mass spectrometers. In a U-Th-Pb dating system, element fractionation effects caused by laser ablation feeding has huge influence on tested Pb / U to Pb / Th ratios and is one of the greatest obstacles against precise laser ablation sample dating; besides, artificial partitioning of ablation time during subsequent data processing can also lead to huge difference in Pb / U and Pb / Tn of samples and further affect dating results. The laser ablation fractionation effect correcting method is based on a standard sample-sample crossed testing method, provides a variety of fitting functions for fitting the nuclideratio data of standard samples to obtain the function parameters of the fitting functions, and then corrects the data of the samples through the parameters of the fitting functions. In corrected massspectrometer data, the accuracy of the Pb / U and Pb / Th ratios is improved, influence of artificial partitioning can be greatly reduced, and the precision of U-Th-Pb dating can be improved.

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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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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