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Method for measuring isotopic abundance ratio of uranium in particles through accelerator mass spectrometry

A technology of isotope abundance and accelerator mass spectrometry is applied in the field of uranium isotope abundance ratio measurement in particles by accelerator mass spectrometry. Effect

Inactive Publication Date: 2015-04-22
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology

[0008] In order to solve the existing analysis methods for the uranium isotope abundance ratio in microparticles of environmental samples, the accuracy of the analysis results is not high, and the analysis process is seriously disturbed. method

Method used

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Examples

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Effect test

Embodiment 1

[0023] The method for measuring the uranium isotope abundance ratio in particles by accelerator mass spectrometry of the present invention is used to analyze a wiped sample, and the main steps are as follows:

[0024] (1) The wiping sample is placed in ethanol, and the sample particles are separated from the carrier by ultrasonic oscillation; the obtained ethanol containing the sample particles is transferred to a graphite sheet, and the graphite sheet loaded with the sample particles is obtained after heating and evaporating the ethanol;

[0025] (2) placing the graphite sheet carrying the sample particles in the electron microscope cavity of the scanning electron microscope, the scanning electron microscope has the functions of micro-operation and X-ray energy spectrum; meanwhile, a silicon chip is also placed in the electron microscope cavity of the scanning electron microscope; Scanning electron microscopy looks for individual sample particles on graphite sheets;

[0026] ...

Embodiment 2

[0034] The method for measuring the uranium isotope abundance ratio in particles by accelerator mass spectrometry of the present invention is used to analyze a simulated wiping sample. The simulated wiping sample is made of uranium standard material. 235 U / 238 U is 1.14×10 -1 , 236 U / 238 U is 4.23×10 -4 .

[0035] The analysis process is similar to Example 1, and the obtained analysis results are as follows: in the uranium-containing particles 235 U / 238 U is (1.11±0.01)×10 -1 , 236 U / 238 U is (4.18±0.16)×10 -4 .

[0036] Comparing the above analysis results with the composition of uranium reference material, the results are as follows: 235 U / 238 U relative error is 2.6%, 236 U / 238 U relative error is 1.2%. It can be seen that the method for measuring the uranium isotope abundance ratio in particles by the accelerator mass spectrometer of the present invention has high accuracy of analysis results and no interference problem occurs.

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Abstract

The invention relates to a control device for the irradiation dose of an irradiation device, and provides a method for measuring the isotopic abundance ratio of uranium in particles through accelerator mass spectrometry. The method aims to solve the problems that an analysis method for the isotopic abundance ratio of uranium in existing environment sample particles is not high in analysis result accuracy, and interference is serious in the analysis process. The method comprises the following steps that 1, the sample particles are separated from a carrier and transferred to a graphite flake through ultrasonic oscillation; 2, the sample particles are transferred into a scanning electron microscope; 3, the uranium-bearing particles are found; 4, the uranium-bearing particles are dissolved; 5, a target is manufactured; 6, ruling is carried out; 7, accelerator parameters needed by each uranium isotope are determined; 8, the counting rate of each uranium isotope is measured; 9, the isotopic abundance ratio of the uranium is calculated. The problem that isotopic abundance ratio analysis of the uranium in the particles has polyatomic ion interference is solved, abundance sensitivity is obviously improved, the obtained analysis result is accurate, and the defect in an existing analysis method is overcome.

Description

technical field [0001] The invention relates to a device for controlling the irradiation dose of an irradiation device, in particular to a method for measuring the uranium isotope abundance ratio in particles by an accelerator mass spectrometer. Background technique [0002] In the field of nuclear safeguards, the introduction of environmental sampling and analysis technology has greatly enhanced the ability to detect undeclared nuclear activities and nuclear materials, and has now become a routine nuclear safeguard technology. [0003] In environmental sampling analysis technology, the analysis method of uranium isotope abundance ratio in environmental sample particles has attracted much attention as the most important analysis method. By analyzing the uranium isotope abundance ratio in environmental sample particles, the method makes accurate judgments on whether there are undeclared uranium-containing materials and the production of uranium materials, so as to realize cor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/22G01N1/34
Inventor 王琛董克君何明赵兴红张燕赵永刚李力力姜山
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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