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Method for measuring uranium isotope ratio in single particles

An isotope ratio and particle technology, applied in the field of nuclear safeguards, can solve the problems of low efficiency, time-consuming and laborious, long measurement cycle, etc., and achieve the effect of shortening the measurement cycle and improving the analysis efficiency.

Inactive Publication Date: 2014-04-16
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology

However, picking and transferring particles by hand is time-consuming and labor-intensive, and the particles are easily lost, resulting in low efficiency.
Moreover, due to many steps such as reactor irradiation, detector etching, particle transfer and TIMS measurement, the measurement cycle is relatively long

Method used

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  • Method for measuring uranium isotope ratio in single particles
  • Method for measuring uranium isotope ratio in single particles

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Embodiment Construction

[0021] The technical solutions and advantages of the present invention will be described in more detail below in conjunction with the accompanying drawings.

[0022] Such as figure 1 Shown is a flow chart of a measurement method for measuring the uranium isotope ratio in a single particle provided by the present invention. The method comprises the steps of:

[0023] Step S1, preparing a uranium-containing particle sample.

[0024] There are two main methods for the preparation of uranium-containing particle samples, that is, the uranium-containing particles are recovered to carbon sheets to form samples by ultrasonic oscillation or negative pressure impact. The first method is to immerse the nuclear pore membrane adsorbed with uranium-containing particles in an organic solvent, and the ultrasonic waves of the ultrasonic instrument generate vibrations to separate the uranium-containing particles from the nuclear pore membrane, suspend them in the organic solution to form a su...

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Abstract

The invention provides a method for measuring a uranium isotope ratio in single particles. The method comprises the following steps: S1, preparing a uranium-containing particle sample; S2, searching and identifying uranium-containing particles in the uranium-containing particle sample by utilizing a scanning electron microscope and an X-ray energy dispersive spectrometer; S3, after finding out the uranium-containing particles, transferring the uranium-containing particles onto a sample belt by utilizing a microoperation system; S4, carrying out isotope analysis on the sample belt by utilizing a thermal ionisation mass spectrometer and obtaining the uranium isotope ratio in the uranium-containing particles. Compared with the prior art, the method for measuring the uranium isotope ratio in the single particles, provided by the invention, does not need to carry out irradiation, cooling and etching, can greatly shorten the measurement period of particle analysis and improves analysis efficiency.

Description

technical field [0001] The invention relates to the technical field of nuclear safeguards, in particular to a method for measuring the uranium isotope ratio in a single particle. Background technique [0002] Particle isotope analysis is one of the important technical methods of nuclear safeguards, which provides an effective way to identify undeclared nuclear materials or activities. Any nuclear production and nuclear experiment activities, regardless of their protection measures, will leave traces in the corresponding environment; by collecting environmental samples inside or around nuclear facilities for particle isotope analysis, important nuclear activities near the sampling point can be obtained information. The technology enhances the ability to detect undeclared nuclear activities and strengthens the effectiveness of the safeguards system. [0003] The particle analysis process includes the steps of particle recovery, identification, localization (transfer) and iso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/223G01N23/225G01N27/62G01N1/28
Inventor 王凡张燕王晓明赵永刚王琛刘宇昂朱建锐
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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