14MeV 速中性子放射化分析法による酸素の定量

概要

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A method for the determination of oxygen in steel and other metals by the ^<16>O(n, p) ^<16>N reaction with 14 MeV neutrons has been investigated. Parameters such as instrumental conditions, sample size, and interferences from other elements can be recognized and their effects are evaluated and experimentally controlled. The sample size is important to obtain a good precision and accuracy. For the industrial routine analysis a preference is given to cylindrical samples of diameter 12.5 mm and thickness 10 mm. In order to ensure a reliable pneumatic transport and minimize the error in counting, tolerances on the size must be kept within ±0.2 mm as strictly as possible. Interferences by B and F on the oxygen analysis are experimentally investigated. B and F of 0.1% correspond to oxygen of 70 and 420 ppm, respectively. The long-term coefficient of variation for analysis of a given sample over a period of 10 days is 4 to 10%. The accuracy of this method is checked by comparison of the results with those of the vacuum fusion method. The agreement of the results obtained by the two methods is satisfactory. The determination of oxygen in various powder samples such as acid insoluble residue in steel and iron powder is also demonstrated with satisfactory results.
社団法人日本鉄鋼協会の論文
1973-03-01