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为研究制灯钨丝质量不稳定的原因,分析其杂质含量极为必要。而中子活化法具有灵敏、准确的特点,是高纯材料中痕量杂质分析的有力手段。西德的G.Grossman和苏联的V.M.Kirllova曾用放射化中子活化法测定了钨中杂质,但尚未见到用仪器中子活化法进行测定的报导。笔者采用仪器中子活化法测定了钨丝、钨粉和仲钨酸铵中铁、钪、铬、钴、锌、铯、铷、锑、镍和钽10种杂质元素,测定灵敏度和精密度均较其它仪器分析法(如光谱法和质谱法)高。它与放射化中子活化法相比,操作简便,其测定灵敏度和精密度可与放化法相比拟。
In order to study the reason of the unstable quality of tungsten lamp, it is necessary to analyze its impurity content. The neutron activation method has the characteristics of being sensitive and accurate and is a powerful method for the analysis of trace impurities in high purity materials. G. Grossman in West Germany and V. M. Kirllova in the Soviet Union have used the radioactive neutron activation method for the determination of impurities in tungsten, but no neutron activation assay has yet been reported. The author used the instrument neutron activation method to determine the ten kinds of impurity elements of tungsten, tungsten powder and ammonium paratungstate in iron, scandium, chromium, cobalt, zinc, cesium, rubidium, antimony, nickel and tantalum, the determination sensitivity and precision are more than other instrument analysis Method (such as spectroscopy and mass spectrometry) high. Compared with the radioactive neutron activation method, it is easy to operate and its sensitivity and precision can be compared with the radiochemical method.