Laser-assisted decontamination—A wavelength dependent study

Nilaya, J. Padma; Raote, Pallavi; Kumar, Aniruddha; Biswas, Dhruba J.

doi:10.1016/j.apsusc.2008.05.348

Cited by 22 publications

(5 citation statements)

References 8 publications

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“…This wavelength dependence has been reported in various fields in which lasers have been applied. For example, Nilaya et al [9] applied the same wavelengths used in our study to decontamination of radioactive substances loosely deposited on stainless steel, and reported the effectiveness of using 1064 nm. In addition, Watanabe et al [10] reported the effects of wavelength in attempts at surface modification of PET fibers using laser irradiation, and discussed the relationship between it and light absorptance.…”

Section: Spectral Reflectancementioning

confidence: 97%

Wavelength dependence of machining performance in UV-, VIS- and NIR-laser cutting of wood

Fukuta¹,

Nomura²,

Ikeda

et al. 2016

J Wood Sci

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Cutting of wood using short-wavelength (266-, 355-, 532-, and 1064-nm) lasers was carried out and wavelength dependence in relation to machining performance and post-processing appearance was investigated. We found that a 355-nm-wavelength laser achieves the greatest machining performance. The variation in machining performance between different wavelengths was due to the different light absorptances of the woods: when we measured the spectral reflectance of the woods, we found that the greater the machining performance for a wavelength, the lower its reflection of light (and thus the greater its absorption). Assuming that the absorption of ultraviolet wavelength of 355 nm by wood is due to lignin, a lignin-free cellulose board was prepared for further investigation, and the same machining and measurements were conducted. The results showed that machining progresses well via the absorption of laser light by lignin at the ultraviolet wavelength of 355 nm. On the other hand, when this cellulose board was impregnated with phenolic resin, there was high absorption of light between the ultraviolet range and wavelengths near 600 nm, machining progressed well at wavelengths of 355 and 532 nm.

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Section: Spectral Reflectancementioning

confidence: 97%

Wavelength dependence of machining performance in UV-, VIS- and NIR-laser cutting of wood

Fukuta¹,

Nomura²,

Ikeda

et al. 2016

J Wood Sci

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“…Although a grinder or blast is commonly used, these may damage the structure of the object and generate radioactive dust, and are not suitable for irregular surfaces [ 4 , 5 ]. Lasers with low decontamination efficiency consume a lot of energy and require special equipment [ 6 ]. Ionic washing accelerates the ion exchange of radionuclides, but its effectiveness for removal is limited [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Fatty Alcohols with Different Chain Lengths on the Performance of Low pH Biomass-Based Foams for Radioactive Decontamination

Zhang

Liang

Xi³

et al. 2022

Molecules

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Compared with polymers and nanoparticles, fatty alcohols can not only increase the stability of foam, but also maintain better foamability at pH < 2, which is beneficial to reduce waste liquid and increase decontamination efficiency for radioactive surface pollution. However, different fatty alcohols have different hydrophobic chain lengths. The effects of fatty alcohols with different chain lengths on the performance of decontamination foam were studied at pH < 2, to assist in the selection of suitable fatty alcohols as foam stabilizers. Combined with betaine surfactant and phytic acid, biomass-based foams were synthesized using fatty alcohols with different chain lengths. When the hydrophobic tail groups of the fatty alcohol and the surfactant were the same, the foam showed the best performance, including the lowest surface tension, the highest liquid film strength, the greatest sag-resistance and the best stability. However, when the hydrophobic tail groups were different, the space between adjacent surface active molecules was increased by thermal motion of the excess terminal tail segments (a tail-wagging effect), and the adsorption density reduced on the gas-liquid interface, leading to increased surface tension and decreased liquid film strength, sag-resistance and stability. The use of decontamination foam stabilized by fatty alcohols with the same hydrophobic group as the surfactant was found to increase the decontamination rate of radioactive uranium pollution from 64 to over 90% on a vertical surface.

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“…Laser cleaning has been reported as an alternate and well-established cleaning technique by several authors [18][19][20][21][22]. It involves surface exposure by a laser beam of short pulse duration and high energy density so that thermal ablation of the material on the surface can take place [23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Study on effective cleaning of gold layer from fused silica mirrors using nanosecond-pulsed Nd:YAG laser

et al. 2013

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A study on effective laser cleaning of gold layer deposited on fused silica substrates used in beamlines of synchrotron radiation (SR) sources using nanosecond-pulsed Nd:YAG laser has been carried out. The influence of pulse duration, beam incidence angle, spot overlapping, laser fluence, and number of passes on cleaning efficiency has been investigated. An approximately 48 nm thick gold layer from a mirror surface area of ~48 cm2 has been cleaned in 3 min. Laser clean quality and efficiency has been analyzed using microscope, scanning electron microscope (SEM), and angle-dependent reflectivity measurement techniques using SR beamline. Optimization of cleaning parameters resulted in a cleaning efficiency of ~98%. This study provides an alternate and low-cost solution for reuse of gold-coated, damaged mirrors.

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Laser-assisted decontamination—A wavelength dependent study

Cited by 22 publications

References 8 publications

Wavelength dependence of machining performance in UV-, VIS- and NIR-laser cutting of wood

Wavelength dependence of machining performance in UV-, VIS- and NIR-laser cutting of wood

Effects of Fatty Alcohols with Different Chain Lengths on the Performance of Low pH Biomass-Based Foams for Radioactive Decontamination

Study on effective cleaning of gold layer from fused silica mirrors using nanosecond-pulsed Nd:YAG laser

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