Mass spectrometric quantitative analysis on the gaseous and volatile products formed by pyrolysis of polyamide(6nylon)and polyvinyl acetate in a vessel containing the calibrated amounts of air at various temperatures was studied. The pyrolytic products were hydrogen, carbon monoxide, carbon dioxide, methanoi, ethanol, acetone, methyl ethyl ketone, dimethyl furan, methyl furan, acetic acid, acetaldehyde, methane, acetylene, ethylene, ethane, propane, propylene, butene, butane, benzene, toluene and others. Similar experiments were also carried out for the polyamide synthetic fiber, and the main components of the gaseous and volatile products formed by pyrolysis were identified. From the results of these works, mass spectrometry seems to be an effective method for the analysis of the pyrolysis product of polyamide and polyvinyl acetate.

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The discussion was made on Pu analysis for the UO2 specimen, which was irradiated to about 8, 000 MWD/T of burnup in a nuclear reactro. Mass spectrometer was equipped with a thermal ionization double-filament source assembly for the purpose of Pu analysis. Although there are an uncertainty, the variation of the ratio of Pu to U indicates a general trend of making maximum value with the semple filament temperature.

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The radio-frequency mass spectrometer, being designed to operate with square wave voltage, showed remarkably improved resolving power. Some of these can also operate with sinusoidal r. f. voltage. Generalized resolving power equations were obtained and were compared with the experimental results.

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Xenon extracted from old tellurium minerals were analyzed with a high-sensitivity mass spectrometer. Old tellurium minerals of different four localities were used in the experiments, that is, tetradymite(Bi₂ Te₂S)from the Oya mine, tellurobismuthite(Bi₂ Te₃)from the Suwa mine, tellurium mineral(AgAuTe+Te)from the Rendai-ji mine and native tellurium(Te)from the Teine mine. In heating the sample minerals, the temperature was raised stepwise typically by100°C and kept constant for a hour. Rare gases extracted at step of extraction temperature were purified and then sealed up in the respective ampoul. Large excesses in¹²⁹Xe, ¹³⁰Xe and¹³¹Xe extracted from the Oya tellurium mineral and in¹³⁰Xe from the Suwa tellurium mineral were found definitely. Their origins were discussed on the basis of the isotopic amonalies patterns as well as experimental and theoretical considerations on the nuclear reaction relating to the relevant isotopis of xenon. The¹³⁰Xe-excess was attributed to doubleβ-decay of¹³⁰Te. A mall excess in¹²⁸Xe was interested in relation to double β-decay of¹²⁸Te. Several nuclear processes which could contribute to¹²⁸Xe were discussed on the available data. Concerning the isotopic amonalies in¹²⁹Xe and¹³¹Xe, the ratio ¹²⁹Xe-excess/¹³⁰Xe-excess(m=129 and 131)seems to decrease and the ratio¹²⁹Xe-excess/¹³¹Xe-excess seems to increase with the increasing tellurium concentration for the Oya tellurium minerals. We may be able to look for a solution of the amonalies in either the epithermal neutron captures on¹²⁸Te and on¹³⁰Te or both the(μ^-, n)reaction of¹³⁰Te and the themal neutron captures on¹²⁸Te and on¹³⁰Te, where the neutrons can be produced by the(μ^-, n)reactions and the(α, n)recations on the environmental rocks. In order to understand the above results on the ratio between Xe-excess, we may have to take into account the competition process between between the neutron captures on¹²⁸Te and on¹³⁰Te and the neutron adsorptions by the associated impurities, and the(a, n)reactions on¹²⁶Te and on¹²⁸Te respectively.

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The authors applied mass spectrometry to estimate nitrogen compounds in Kuwait petroleum distillates(290 to 310°C). Nitrogen compounds were condensed from gas oil by Florisil liquid chromatography. Carbon number distribution of each compound types was measured by low voltage ionization method. The abundance order of the type of nitrogen compounds were as follows: CnH2n-5N(0.024%)CnH2n-7N(0.0075%)CnH2n-17N(0.0032%)CnH2n-oN(0.0017%)CnH2n-15N(0.0097%)CnH2n-11N(0.0070%)CnH2n-13N(0.0024%)Distribution of carbon number was existed from C10 to C21, and apex of distribution was shown from C13 to C16.

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