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Laser decontamination of the surface of a shaped component

A technology for forming parts, lasers, used in radioactive purification, chemical instruments and methods, cleaning methods using gas flow, etc.

Inactive Publication Date: 2008-02-13
通用核材料公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no laser decontamination systems appear to have been used inside nuclear facilities for cleaning and dismantling

Method used

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  • Laser decontamination of the surface of a shaped component
  • Laser decontamination of the surface of a shaped component
  • Laser decontamination of the surface of a shaped component

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Embodiment Construction

[0035] By illuminating a surface with a pulsed laser, a portion of the laser energy is absorbed by the material and, depending on its absorption rate for that wavelength of laser light, this creates a temperature gradient across the thickness of the material. There are three main processes in the initiation of the ablation phenomenon: heating mechanism, mechanical mechanism and photochemical mechanism. These mechanisms are closely related, but depending on the properties of the substrate in terms of laser wavelength and pulse duration, one of them becomes dominant during the ablation process.

[0036] Due to the short wavelength of the laser, the absorption rate of the metal material is more important. Excimer lasers have very high energy photons (4-8 eV) that are absorbed by materials of small thickness (a few nanometers) and thermal diffusion lengths are typically on the order of 1 micron. They transfer their energy to the electrons of the material, which by de-excitation w...

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Abstract

The invention concerns laser decontamination of the surface of a shaped component (3). Said decontamination comprises the following steps: successively impinging parts of the surface of the shaped component (3) with pulsed laser beams of wavelengths in the ultraviolet range and enabling the surface layer of the shaped component (3) to be ablated in the form of particles, the laser beams being distributed so as to cover simultaneously each treated part; and recuperating by suction said particles.

Description

technical field [0001] The present invention relates to the decontamination (in particular radioactive decontamination / decontamination) of the surface of a profiled part by means of a laser beam. [0002] A profiled part means a part which has a relatively large length relative to its cross section, wherein the cross section remains constant. This can be a metallurgical product obtained, for example, by hot rolling or cold drawing. This could also be (and the present invention will specifically address this case) nuclear fuel element pins. [0003] More specifically, the present invention relates to the removal of material from the surface of a shaped part comprising subjecting the surface of the part to impingement with a pulsed laser beam emitted in ultraviolet light and simultaneously sucking the material removed from the surface of the shaped part through a filter. [0004] However, the invention can be applied in all industrial fields where it is necessary to remove lay...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61L2/10
CPCG21F9/005A61L2/10B08B5/04A61L2202/122B08B7/0042A61L2/08
Inventor B·特科M·菲舍尔
Owner 通用核材料公司