Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for measuring isotopic ratios of uranium-bearing particles by using FIB-TIMS

A technology of isotope ratio and particles, which is applied in measuring devices, material analysis using wave/particle radiation, instruments, etc., can solve the problems of easy introduction of impurities, cumbersome processing steps, and influence on the accuracy of analysis results, etc., to achieve a fast and convenient process, The effect of reducing sample loss, reducing the effects of reagent contamination and background interference

Inactive Publication Date: 2019-02-15
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
View PDF7 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention discloses a method for measuring the isotope ratio of uranium-containing particles by FIB-TIMS, which solves the problem that in the prior art, the way of solution sampling is often used to analyze uranium-containing particles, the pretreatment steps are cumbersome, and impurities are easily introduced during the particle dissolution process, which affects The accuracy of the analysis results, etc.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for measuring isotopic ratios of uranium-bearing particles by using FIB-TIMS
  • Method for measuring isotopic ratios of uranium-bearing particles by using FIB-TIMS
  • Method for measuring isotopic ratios of uranium-bearing particles by using FIB-TIMS

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The isotope ratio of uranium-containing particles is analyzed by FIB-TIMS and the double rhenium band technique, which includes the following steps:

[0041] (1) Cut the ultrapure silicon wafer into a size of 0.5 cm × 0.5 cm, ultrasonically clean it with acetone, ethanol, and deionized water respectively, repeat three times, and dry it with high-purity nitrogen for later use;

[0042] (2) Ultrasonically disperse the sample containing uranium-containing particles in an ethanol solution, and transfer the ultrasonically dispersed sample of uranium-containing particles to the ultrapure silicon wafer prepared in step (1), and the ethanol solution is kept at room temperature evaporate to dryness;

[0043] (3) Paste a layer of double-sided conductive adhesive on the upper surface of the sample stage used in the focused ion beam (FIB) instrument, and then paste ultra-pure silicon wafers carrying uranium-containing particle samples on the upper surface of the conductive adhesive...

Embodiment 2

[0050] The isotopic ratio of uranium-containing particles was analyzed by FIB-TIMS and the single rhenium band technique, the method consists of the following steps:

[0051] (1) Cut the ultrapure silicon wafer into a size of 0.5 cm × 0.5 cm, ultrasonically clean it with acetone, ethanol, and deionized water respectively, repeat three times, and dry it with high-purity nitrogen for later use;

[0052] (2) Ultrasonically disperse the sample containing uranium-containing particles in an ethanol solution, and transfer the ultrasonically dispersed sample of uranium-containing particles to the ultrapure silicon wafer prepared in step (1), and the ethanol solution is kept at room temperature evaporate to dryness;

[0053] (3) Paste a layer of double-sided conductive adhesive on the upper surface of the sample stage used in the focused ion beam (FIB) instrument, and then paste ultra-pure silicon wafers carrying uranium-containing particle samples on the upper surface of the conductiv...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for measuring isotopic ratios of uranium-bearing particles by using FIB-TIMS. Problems of complicated process, long consumed time, high probability of damages on samples, poor result accuracy and the like in the prior art are solved. The method for measuring the isotopic ratios of the uranium-bearing particles by using FIB-TIMS comprises the following steps: firstly, identifying and positioning the uranium-bearing particles by using SEM and EDS functions of a focused ion beam; secondly, controlling a tungsten needle to transfer the uranium-bearing particles toa rhenium filament by using a micro-operation arm of the focused ion beam; welding and fixing the uranium-bearing particles on the rhenium filament by using an ion beam deposition technology; and thirdly, measuring the isotopic ratios of the uranium-bearing particles by using thermal ionization mass spectrometry. The method for measuring the isotopic ratios of the uranium-bearing particles by using FIB-TIMS, disclosed by the invention, has the advantages that a solid sample of the rhenium filamenturanium-bearing particle can be directly analyzed by fixing an uranium-bearing particle sample onthe surface of the rhenium filament; a pretreatment method is simple, fast, stable and reliable; the sample utilization rate is high; reagent pollution and sample loss are avoided; the accuracy and precision of an analysis result are high; and the isotopic ratios, including 235U / 238U, 234U / 238U and 236U / 238U, of the uranium can be analyzed.

Description

technical field [0001] The invention belongs to the field of nuclear monitoring and nuclear environment analysis, in particular to a method for measuring the isotope ratio of uranium-containing particles by FIB-TIMS. Background technique [0002] The improvement and strengthening of the nuclear safeguards system of the International Atomic Energy Agency (IAEA) originated from the "93+2" plan proposed in the last century. This plan is dedicated to improving the effectiveness of existing nuclear safeguards by strengthening environmental sampling and analysis . As an important measure of this system, particle analysis of environmental wipe samples has been the focus of research and application. Particle analysis can provide more accurate and detailed information, through the measurement and analysis of individual particles with a particle size of micron or submicron in the swab sample, it provides the isotope ratio in these uranium-containing particles, thereby avoiding enviro...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/2251G01N23/2208G01N27/62
CPCG01N23/2208G01N23/2251G01N27/626
Inventor 熊鹏辉王丽萍孟宪东张凌吴昊曦许杰陈禄敏秦震魏兴俭
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com