Articles you may be interested inHigh repetition rate laser-induced breakdown spectroscopy using acousto-optically gated detection Rev. Sci. Instrum. 85, 073104 (2014); 10.1063/1.4890337 Experiment investigation on microstructure and mechanical properties of TC17 titanium alloy treated by laser shock peening with different laser fluence J. Laser Appl. 25, 042001 (2013); 10.2351/1.4800444 Detection of deuterium and hydrogen using laser-induced helium gas plasma at atmospheric pressure J. Appl. Phys. 98, 093302 (2005); 10.1063/1.2126789 Hydrogen analysis of zircaloy tube used in nuclear power station using laser plasma technique J. Appl. Phys. 96, 6859 (2004); 10.1063/1.1808480Hydrogen emission by Nd -YAG laser-induced shock wave plasma and its application to the quantitative analysis of zircalloy An experimental study has been carried out for the development of quantitative deuterium analysis using the neodymium doped yttrium aluminum garnet laser-induced breakdown spectroscopy ͑LIBS͒ with atmospheric pressure surrounding He gas by exploring the appropriate experimental condition and special sample cleaning technique. The result demonstrates the achievement of a full resolution between the D and H emission lines from zircaloy-4 samples, which is prerequisite for the desired quantitative analysis. Further, a linear calibration line with zero intercept was obtained for the emission intensity of deuterium from a number of zircaloy samples doped with predetermined concentrations of deuterium. The result is obtained by setting a +4 mm defocusing position for the laser beam, 6 s detection gating time, and 7 mm imaging position of the plasma for the detection, which is combined with a special procedure of repeated laser cleaning of the samples. This study has thus provided the basis for the development of practical quantitative deuterium analysis by LIBS.
It is shown that remarkable improvements essential to a quantitative spectrochemical analysis of hydrogen emissions from the zircaloy samples were achieved when the low-pressure surrounding air used in the previous experiment of Nd-YAG laser-induced shockwave plasma was replaced by an inert gas. Using the high-purity (99.999%) nitrogen gas at 1.5 Torr, a linear calibration curve of the HI 656.2 nm emission line was obtained with a zero intercept from the zircaloy samples prepared with various hydrogen concentrations. Further, when the surrounding nitrogen gas was replaced by a helium gas, more than an order of magnitude enhancement was obtained on the signal-to-noise ratio, yielding a detection limit of less than 5 ppm.
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