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A comparative study on the laser removal of Cs+ ion from type 304 stainless steel
원휘준,Byambatseren Baigalmaa,Jei-Kwon Moon,Chong-Hun Jung,Kune-Woo Lee 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.6
A Q-switched Nd:YAG laser with a 1,064 nm and 450 mJ/pulse was employed to study the cleaning characteristics of Type 304 stainless steel specimens artificially contaminated with Cs+ ions. Before laser irradiation, the specimens were treated with KCl and KNO3, respectively. The relative atomic molar percent of Cs+ ion on a metal surface was analyzed by EPMA. Before and after the laser irradiation, the morphology of the metal surfaces was investigated by SEM. The optimum laser fluence determined in the experimental range was 57.3 J/cm2. For all the test specimens,more than 95% of the Cs+ ions were removed by the application of 40 laser shots at 57.3 J/cm2. Cs+ ion removal efficiency was improved by the addition of nitrate ions to the contaminated metal surface. Surface temperature during the laser irradiation was calculated using Hertz-Knudsen equation to investigate the surface characteristics. A portion of particulates generated during the laser irradiation was found to accumulate around a crater of the specimen treated with the KCl solution. It was concluded that the ablated Cs+ ions formed an oxide after thermal activation on the surface and deposited on a metal surface for the KCl system. The higher Cs+ ion removal efficiency of the KNO3 system was attributed to the decomposition of the nitrate ions at a relatively low temperature and the easy reaction of the Cs+ ions with the oxygen generated from the decomposition of nitrate ions.
Jei-Kwon Moon,Byambatseren Baigalmaa,Hui-Jun Won,Kune-Woo Lee 한국방사성폐기물학회 2010 방사성폐기물학회지 Vol.8 No.3
레이저 용발법에 의한 금속 표면 제염특성을 평가하였다. 레이저로는 파장 532 nm, 펄스에너지 150 mJ, 펄스폭 5 ns의 큐스위치 Nd:YAG 를 적용하였고, 금속 표면에 CsNO3, Co(NH4)2(SO4)2, Eu2O3 그리고 CeO2를 오염시켜 이들의 제염 특성을 평가하였다. 제염 변수로는 레이저 적용횟수, 레이저 에너지 밀도 및 레이저 조사 각도 특성을 평가하였으며 각각 8, 13.3 J/cm2 및 30o의 최적 조건을 확인하였다. 제염 효율은 오염성분의 비점과 관련이 있었으며 CsNO3>Co(NH4)2(SO4)2>Eu2O3>CeO2 순이었다. 또한 여러 에너지 밀도 조건에서 스테인레스 스틸 재질의 식각 깊이 제어 특성을 규명하였다. Metal surface decontamination characteristics were investigated by using a laser ablation method. A second harmonic generation of a Q-switched Nd:YAG laser with a wave length of 532 nm, a pulse energy of 150 mJ and a pulse width of 5 ns was employed to assess the decontamination performance for metal surfaces contaminated with CsNO3, Co(NH4)2(SO4)2, Eu2O3 and CeO2. The ablation behavior was investigated for the decontamination variables such as a number of laser shots, laser fluence and an irradiation angle. Their optimum values were found to be 8,13.3 J/cm2 and 30o, respectively. The decontamination efficiency was different depending on the kinds of the contaminated ions, due to their different melting and boiling points and was in the order: CsNO3>Co(NH4)2(SO4)2>Eu2O3>CeO2. We also evaluated a correlation between the metal ablation thickness and the number of laser shots for the different laser fluences.
문제권,바이갈마,원휘준,이근우,Moon, Jei-Kwon,Baigalmaa, Byambatseren,Won, Hui-Jun,Lee, Kune-Woo Korean Radioactive Waste Society 2010 방사성폐기물학회지 Vol.8 No.3
Metal surface decontamination characteristics were investigated by using a laser ablation method. A second harmonic generation of a Q-switched Nd:YAG laser with a wave length of 532 nm, a pulse energy of 150 mJ and a pulse width of 5 ns was employed to assess the decontamination performance for metal surfaces contaminated with $CsNO_3$, $Co(NH_4)_2(SO_4)_2$, $Eu_2O_3$ and $CeO_2$. The ablation behavior was investigated for the decontamination variables such as a number of laser shots, laser fluence and an irradiation angle. Their optimum values were found to be 8, 13.3 J/$cm^2$ and $30^{\circ}$, respectively. The decontamination efficiency was different depending on the kinds of the contaminated ions, due to their different melting and boiling points and was in the order: $CsNO_3>Co(NH_4)_2(SO_4)_2>Eu_2O_3>CeO_2$. We also evaluated a correlation between the metal ablation thickness and the number of laser shots for the different laser fluences.