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A Method for Measuring Uranium Isotope Ratio in Single Particle

A technology of isotope ratio and particles, applied in the field of nuclear technology monitoring, can solve the problems of many steps, time-consuming, poor positioning accuracy, etc., and achieve the effect of high accuracy and precision, simple and fast method, and simple method

Active Publication Date: 2017-03-22
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The calculation process of this method is relatively complicated, and it needs to record the coordinates of three positioning points and particles before and after conversion (that is, in different coordinate systems). There are many steps, and it takes a long time (it takes 30 minutes to complete a particle positioning process), and the efficiency is low.
In addition, the positioning accuracy of this method is poor, and there is usually a deviation of more than ten μm after coordinate transformation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for measuring the uranium isotope ratio in a single particle, the method comprising the steps of:

[0026] (1) After the wiping sample containing uranium particles is recovered by ultrasonic oscillation, it is transferred to a carrier sheet;

[0027] (2) The surface of the used sample stage of the LA-ICP-MS analysis instrument is pasted with a layer of double-sided silver glue, and then a copper mesh with a mark is pasted on the upper surface of the double-sided silver glue; the scanning electron microscope is used to find the step (1 ) on the carrier sheet described in ), and the micro-operating system controls the tungsten needle to transfer the single uranium particle to the double-sided silver glue in any grid of the conductive metal mesh; the thickness of the copper mesh is 20 μm, and each The size of a small grid is 100μm*100μm.

[0028] (3) The optical microscopic imaging system of the LA-ICP-MS analysis instrument repositions the particles within the g...

Embodiment 2

[0030] The method, steps and equipment used in Example 1 are the same, except that the material of the conductive metal mesh is aluminum mesh, the thickness of the aluminum mesh is 15 μm, and the size of each small grid is 90 μm*120 μm. Among them, the parameters of LA-ICP-MS are that the laser beam spot is 8 μm, the laser frequency is 12 Hz, and the laser power density is 2.0×10 8 W / cm 2 , RF power 900W.

Embodiment 3

[0032] The method, steps and equipment used in Example 1 are the same, except that the material of the conductive metal mesh is silver mesh, the thickness of the silver mesh is 20 μm, and the size of each small grid is 120 μm*120 μm. The parameters of LA-ICP-MS are that the laser beam spot is 14 μm, the laser frequency is 4 Hz, and the laser power density is 1.5×10 8 , RF power 1100W.

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Abstract

The invention belongs to the technical field of monitoring of nuclear technology, and discloses a method for measuring the isotope ratio of uranium in a single particle. The method comprises the following steps: firstly seeking a uranium-containing particle by using a scanning electron microscope, using a micro-operation system to transfer the uranium-containing particle to a conductive adhesive with a marked metal mesh on the surface, positioning and fixing the uranium-containing particle, and then analyzing the isotope ratio by using a laser ablation-inductively coupled plasma mass spectrometry. The method has the advantages of simple and quick pre-treatment method, simplified analysis flow, and high analysis precision which can reach to 1%.

Description

technical field [0001] The invention belongs to the technical field of nuclear technology monitoring, and in particular relates to a method for measuring the uranium isotope ratio in a single particle. Background technique [0002] Any nuclear production and nuclear experiment activities, regardless of their protective measures, will leave traces in the corresponding environment. By collecting environmental samples in or around nuclear facilities for particle isotope analysis, important nuclear activities near the sampling point can be obtained information. Therefore, particle isotope analysis is one of the important technical methods of nuclear technology monitoring, and provides an effective way to determine undeclared nuclear materials or nuclear activities. The technology enhances the ability to detect undeclared nuclear activities and strengthens the effectiveness of the safeguards system. In addition, particle isotope analysis technology also has good application pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N27/64
Inventor 王凡张燕赵永刚李力力李金英鹿捷
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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