Radon decay monitoring in air using characteristic emission of species in metal-assisted LIBS

Moosakhani, A.; Parvin, Parviz; Majdabadi, Abbas; Hashemi, Mohammad Masoud

doi:10.1016/j.radmeas.2016.06.007

Cited by 4 publications

(1 citation statement)

References 33 publications

(36 reference statements)

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“…In recent years, laser-induced breakdown spectroscopy (LIBS) has been extensively researched and applied [1]. The technology has been investigated in various areas, including soil organic matter [1][2][3][4] and heavy metal detection [5][6][7], atmospheric environmental monitoring [8][9][10], water quality monitoring [11,12], and industrial testing [13,14].…”

Section: Introductionmentioning

confidence: 99%

A research on the effect of plasma spectrum collection device on LIBS spectral intensity

LIN 林,

DONG 董,

LIN 林

et al. 2024

Plasma Sci. Technol.

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Only a small amount of spectral information is collected because the collection solid angle of the optical fiber probe and lens is very limited，when collecting spectral information. To overcome this limitation, this study presents a novel method for acquiring plasma spectral information from various spatial directions. A parabolic-shaped plasma spectral collection device(PSCD) is employed to effectively collect more spectral information into the spectrometer, thereby enhancing the overall spectral intensity. The research objects in this study were soil samples containing different concentrations of heavy metals Pb, Cr, and Cd. The results indicate that the PSCD significantly enhances the spectral signal, with an enhancement rate of up to 45%. Moreover, the signal-to-noise ratio also increases by as much as 36%. Simultaneously, when compared to the absence of a device, it is found that there is no significant variation in plasma temperature when the PSCD is utilized. This observation eliminates the impact of the spatial effect caused by the PSCD on the spectral intensity. Consequently, a concentration-spectral intensity relationship curve is established under the PSCD. The results revealed that the linear fitting R2 for Pb, Cr, and Cd increased by 0.011, 0.001, and 0.054, respectively. Additionally, the limit of detection (LOD) decreased by 0.361 ppm, 0.901 ppm, and 0.602 ppm, respectively. These findings indicate that the spectral enhancement rate elevates with the increase in heavy metal concentration. Hence, the PSCD can effectively enhance the spectral intensity and reduce the detection limit of heavy metals in soil.

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Section: Introductionmentioning

confidence: 99%

A research on the effect of plasma spectrum collection device on LIBS spectral intensity

LIN 林,

DONG 董,

LIN 林

et al. 2024

Plasma Sci. Technol.

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Effect of hydrocarbon molecular decomposition on palladium-assisted laser-induced plasma ablation

et al. 2017

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The Q-switched Nd:YAG laser is focused on a palladium target in the control chamber filled with various hydrocarbon atmospheres (C1-C4) to investigate their effect on the palladium ablated mass, gas reaction products, and corresponding plasma parameters (such as electron density N_e and plasma temperature T_e) during molecular decomposition. The plasma parameters arise mainly from the Pd nanocatalytic activity during the laser-induced plasma process. We compare synthetic air atmosphere to hydrocarbon media to understand how the latter generates excess heat via oxygen-free exothermic (recombination) reactions. Subsequently, this gives rise to more energetic plasma and higher temperature, regarding the large amount of nanoparticles released into the plasma. The dynamics of the decomposition/recombination events accompany the nanocatalyst activity, leading to soot deposition all over the chamber.

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Laser-induced plasma imaging for low-pressure detection

et al. 2018

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A novel technique based on laser induced plasma imaging is proposed to measure residual pressure in sealed containers with transparent walls, e.g. high voltage vacuum interrupter in this paper. The images of plasma plumes induced on a copper target at pressure of ambient air between 10Pa and 10Pa were acquired at delay times of 200ns, 400ns, 600ns and 800ns. All the plasma images at specific pressures and delay times showed a good repeatability. It was found that ambient gas pressure significantly affects plasma shape, plasma integral intensities and expansion dynamics. A subsection characteristic method was proposed to extract pressure values from plasma images. The method employed three metrics for identification of high, intermediate and low pressures: the distance between the target and plume center, the integral intensity of the plume, and the lateral size of the plume, correspondingly. The accuracy of the method was estimated to be within 15% of nominal values in the entire pressure range between 10Pa and 10Pa. The pressure values can be easily extracted from plasma images in the whole pressure range, thus making laser induced plasma imaging a promising technique for gauge-free pressure detection.

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Radon decay monitoring in air using characteristic emission of species in metal-assisted LIBS

Cited by 4 publications

References 33 publications

A research on the effect of plasma spectrum collection device on LIBS spectral intensity

A research on the effect of plasma spectrum collection device on LIBS spectral intensity

Effect of hydrocarbon molecular decomposition on palladium-assisted laser-induced plasma ablation

Laser-induced plasma imaging for low-pressure detection

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