title: Quantitative hydrogen analysis of zircaloy-4 using low-pressure laser plasma technique.
abstract: It is found in this work that variation of laser power density in low-pressure plasma spectrochemical analysis of hydrogen affects sensitively the hydrogen emission intensity from the unwanted and yet ubiquitous presence of ambient water. A special experimental setup has been devised to allow the simple condition of focusing/defocusing the laser beam on the sample surface. When applied to zircaloy-4 samples prepared with various hydrogen impurity concentrations using low-pressure helium surrounding gas, good-quality hydrogen emission lines of very high signal to background ratios were obtained with high reproducibility under weakly focused or largely defocused laser irradiation. These measurements resulted in a linear calibration line with nonzero intercept representing the residual contribution from the recalcitrant water molecules. It was further shown that this can be evaluated and taken into account by means of the measured intensity ratio between the oxygen and zirconium emission lines. We have demonstrated the applicability of this experimental approach for quantitative determination of hydrogen impurity concentrations in the samples considered.
authors.affiliation: Research Center of Maju Makmur Mandiri Foundation, 40 Srengseng Raya, Kembangan, Jakarta Barat 11630, Indonesia. kurnia18@cbn.net.id
authors.forename: Koo Hendrik
authors.initials: KH
authors.lastname: Kurniawan
authors.forename: Marincan
authors.initials: M
authors.lastname: Pardede
authors.forename: Rinda
authors.initials: R
authors.lastname: Hedwig
authors.forename: Zener Sukra
authors.initials: ZS
authors.lastname: Lie
authors.forename: Tjung Jie
authors.initials: TJ
authors.lastname: Lie
authors.forename: Davy Putra
authors.initials: DP
authors.lastname: Kurniawan
authors.forename: Muliadi
authors.initials: M
authors.lastname: Ramli
authors.forename: Ken-ichi
authors.initials: K
authors.lastname: Fukumoto
authors.forename: Hideaki
authors.initials: H
authors.lastname: Niki
authors.forename: Syahrun Nur
authors.initials: SN
authors.lastname: Abdulmadjid
authors.forename: Nasrullah
authors.initials: N
authors.lastname: Idris
authors.forename: Tadashi
authors.initials: T
authors.lastname: Maruyama
authors.forename: Kiichiro
authors.initials: K
authors.lastname: Kagawa
authors.forename: May On
authors.initials: MO
authors.lastname: Tjia
mesh_terms: D002138:Calibration; D006859:Hydrogen / Q000032:analysis*; D007834:Lasers; D011312:Pressure; D012680:Sensitivity and Specificity; D020349:Surface Plasmon Resonance / Q000295:instrumentation / Q000379:methods*; D013499:Surface Properties; D015040:Zirconium / Q000737:chemistry*
chemical_list: D006859:Hydrogen; D015040:Zirconium