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Portable nuclear material screening instrument

A nuclear material and portable technology, applied in the field of nuclear security, can solve problems such as difficult non-destructive analysis and no mature solution, and achieve the effect of improving sensitivity and collection efficiency

Inactive Publication Date: 2021-05-25
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the determination and classification of the overall composition of suspicious materials intercepted or found on the spot mainly rely on the non-destructive radiation analysis methods of gamma ray spectrometers and neutron detectors, but there is no on-site non-destructive analysis and rapid identification of the elemental components of suspicious substances. mature solution
[0003] Most of the existing elemental composition analysis techniques require sample pretreatment, it is difficult to carry out non-destructive analysis, and it is impossible to provide elemental composition information of suspicious materials for nuclear security decision-making and evidence collection in the first place. Therefore, it is urgent to develop new nuclear material composition screening technologies. Identification of elements to quickly determine the identity of intercepted material

Method used

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Examples

Experimental program
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Effect test

experiment example 1

[0077]Laboratory application verification was carried out using pebbles, granite samples and uranium ore samples with nominal radiation values ​​of 139.7nC / kg·h and 6.16nC / kg·h. The results show that the spectrum of the pebbles used in the test is relatively clean, the main components are calcium, aluminum, and sodium elements, and no spectral lines of uranium are observed, which can be judged as non-uranium-containing substances. The spectral lines of granite products are mainly derived from aluminum and iron elements. Only one spectral line at U 383.96nm is identified as possible uranium element, and the interference of Mg 383.83nm spectral line cannot be ruled out, which is not enough to determine the existence of uranium element.

[0078] From the sample with a radiation dose of 139.7nC / kg h, 17 spectral lines of uranium can be identified, especially the UII454.36nm and U591.53nm spectral lines have no interference lines in the range of ±0.5nm, so we can be sure that the sa...

experiment example 2

[0081] The verification test was carried out by using uranium oxide nuclear fuel with similar appearance, metal aluminum block, and metal iron block. The test results show that there are obvious differences in the laser plasma spectra of the three samples. The spectrum of the metal aluminum sample cannot detect the characteristic line of uranium element, so it can be released. Several characteristic spectral lines of suspected uranium elements can be detected in the metallic iron sample, and the software gives the identification result of the existence of low-confidence uranium elements, and lists the interference sources of the spectral lines. The uranium oxide nuclear fuel identified 17 characteristic spectral lines of uranium during the test, especially the detection of the U II 591.57nm isospectral line, which can eliminate the misjudgment caused by the spectral lines of other elements, and the prototype identified the test sample as uranium-containing nuclear Materials, ...

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Abstract

The invention relates to a portable nuclear material screening instrument. The portable nuclear material screening instrument comprises a laser, a spectrograph and an optical assembly. Laser emitted by the laser device is focused on an object to be measured through the optical assembly, a material on the surface of the object to be measured is gasified, ionized and excited to form light-emitting plasma, and degenerated laser rays of the light-emitting plasma are transmitted into the spectrograph through the optical assembly so as to determine the element components of the object to be measured through the wavelength of the atomic spectrum. The instrument has the following beneficial effects: 1, the laser is focused on the measured object to form the luminous plasma, and the spectrograph performs spectral analysis on the plasma to determine the element components of the material to be measured, so that the rapid analysis of the nuclear material can be realized; and 2, the optical assembly is integrated in the handle, and the spectrograph is arranged in the backpack, so that the portable and movable detection can be realized.

Description

technical field [0001] The invention belongs to the field of nuclear security, and in particular relates to a portable nuclear material screening instrument. Background technique [0002] With the continuous occurrence of terrorist violence, mass incidents and the use of high-tech explosive devices and other factors, the international security situation is becoming more and more severe. Faced with this situation, governments of various countries have strengthened the strength and scope of security inspections, and constantly adopt new technology and new equipment. Classification and evidence collection techniques for the radioactivity, physical properties, isotopes, and elemental components of discovered or intercepted nuclear materials or samples are important tools for nuclear security work. At present, the determination and classification of the overall composition of suspicious materials intercepted or found on the spot mainly rely on the non-destructive radiation analy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/63
CPCG01N21/63
Inventor 高智星胡凤明班晓娜李静王钊张绍哲
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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