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[in Japanese]
1959 Volume 1959 Issue 12 Pages
3
Published: March 31, 1959
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Nobuji Sasaki
1959 Volume 1959 Issue 12 Pages
4-16
Published: March 31, 1959
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Yoshio Kubota
1959 Volume 1959 Issue 12 Pages
17-26
Published: March 31, 1959
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Hiroshi Miyake, Shozo Oshima
1959 Volume 1959 Issue 12 Pages
27-33
Published: March 31, 1959
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Yoshihiko Sugahara
1959 Volume 1959 Issue 12 Pages
34-45
Published: March 31, 1959
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Hirohiko Ezoe, Tomonao Hayashi
1959 Volume 1959 Issue 12 Pages
45-49
Published: March 31, 1959
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A non-magnetic velocity modulation type mass spectrograph is proposed, in which the bunching effect of the velocity-modulated ion beams is applied as R.R. Wilson had published in his report on the Isotron. While the Isotron handles a bunch of an isotope formed at a definite position in space, in the present paper the problems on the recording of the mass spectrum consisting of the spatially distributed bunches are discussed. The neces sary applied voltages, frequencies, and geometrical. dimensions for practical uses are also calculated.
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Tutomu Makita
1959 Volume 1959 Issue 12 Pages
49-56
Published: March 31, 1959
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A sample reservoir with the capacity of about 30ml contains a very small amount of sample at about 10μHg. At first the upper end of th reservoir is communicated with the ionization chamber through a leak. After a given short time interval the lower end of the reservoir is communicated with reservoir containing a liquid, preferably mercury, and the liquid begins to flow into the reservoir at a rate which is a definite function of time. If now the scanning is performed with a definite time schedule, it may easily be proved that the height of the peak corresponding to a given substance is proportional to its initial partial pressure, which is a necessary condition for the exact analysis of the gas mixtures. The smaller the sample reservoir, the more pronounced is the change with time in relative concentrations of the substances with different molecular weights. But a proper choice of the time function for the flow-in rate of the liquid and the scanning beginningwith ions of lighter component, can largely compensate this tendency. A preliminary test of the present method of analysis for a very small amount of sample was performed with a Ne+N2 mixture contained in the 3 litre reservoir attached to a CEC 21-401 mass spectrometer. The usual macro-analysis and the micro-analysis of the sample were repeated several times alternately. The results obtained with the two kinds of analysis agreed within ±0.5%.
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J. Okamoto, H. Tsuyama, M. Kakuta
1959 Volume 1959 Issue 12 Pages
56-60
Published: March 31, 1959
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In this paper a new design of a simple ion source of mass spectrometer for solid material, and the techniques as well as the results of the experiments on the isotopic analysis of lead are introduced. The instrument is the Hitachi mass spectrometer, Type RMU-5. Slight changes are made on the ion source for gas analysis. The repeller electrode is a thin Platinum plate and can be heated by electron bombardment from the rearside. After the sample is mountedon the front side of the repeller electrode, the electrode is assembled the ion source. The sample is vapourized and ionized by electron impact. The results obtained with the natural lead were consistent with those by others. The analysis of the lead in Enaliteat Gifu Prefecture gave the following results:
204Pb-0.96%,
206Pb-24.98%,
207Pb-21.28%, and
208Pb-52.77%. The age of this mineral was estimated to be about 5×10
7 years. This ion source can be conveniently used for solid materials which are vapourized at moderate temperature.
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Qualitative Analysis
Nobuji Sasaki, Masaru Onchi, Junjiro Kai, Yasuhiko Abe
1959 Volume 1959 Issue 12 Pages
61-63
Published: March 31, 1959
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A Mattauch-type double focusing mass spectrograph was construced for the analyses of solid samples and has been om operation since A ugust 1958 in Kyoto University. A photographic Plate of 15 cm length can cover the mass range from any mass M to10 M by a single exposure. Zirconium, germanium, sillicon and graphite have been shown to contain much more impurity elements than those detcted by optical emission spectroscopy. One minute sparking, consuming only about 0.03 mg of the sample, is sucfficent to detect impurities of several ppm.
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Quantitative Analysis
Nobuji Sasaki, Junjiro Kai
1959 Volume 1959 Issue 12 Pages
64-68
Published: March 31, 1959
Released on J-STAGE: July 05, 2011
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Mass spectrograms have been recorded on an Ilford Q-2 plate by suitably varying time of exposure t in our Mattauch-type mass spectrograph with a high-frequency discharge ion source with iron as electrodes. The densities D of the four isotopic lines on one mass spectrogram cover a considerable portion of the log D vs log rt curve, or the D-curve, for the relative abundnaces r of the isotopes differ widely. It has now been found that these portions obtained for different values of t can fuse together, partially overlapping, into one smooth D-curve, if only the values of t are properly adjusted. This adjustment is necessary to correct among others the error of time measurement and the fluctuation of sparking condition, and therefore, less important for larger t. The shape of the D-curve thus obtained for Fe is almost the same as those obtained for Zr, Si, C, and Cu, all in the elementary state and even for Hf contained in a very large amount of Zr. Suppose the D-curve obtained for an element A contained in a certain other element B at the atom fraction f, takes the same shape* and can be brought to the same position with the D-curve obtained for A in the elementary state, when afrt is taken as abscissa instead of rt. If now a, which is a suitably chosen constant, is nearly equal to unity, the D-curve determined with the elementary A may be used as the calibration curve for the impurity analysis of B samples containing A at any atom fraction. If a on the contrary differs appreciably from unity but remains nearly constant for a certain range of f, the D-curve determined with one standrard sample with f within that range may be used for the analysis of any B sample with f falling within the same range. As no standard sample was available, determinations of small impurities ranging from 0.001 to 0.5 wt. per cent have been carried out, assuming tentatively a is unity. The results differ more or less from the figures given in the specifications of the samples used, but the reproducibility within the limit of error±3∼±8 per cent has been obtained for 0.05 per cent Fe in Zr. Elements possessing no isotope* can also be determined in a similar manner with some additional procedures. The whole situation would be improved if the loss in weight of the electrodes or the energy consumption during sparking be introduced instead of time of exposure.The investigation is now under way. (*Recently this has been found really the case for Fe in Zr, and Cu and Mn in“pure”Fe by applying the same adjustments of t used for the construction of the D-curve for the substrate elements Zr and Fe, respectively to the strongest of the four isotopic lines of Fe in Zr, to the two isotopic lines of Cu in Fe, and to the single line of non-isotopic Mn in Fe.)
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Nobuji Sasaki, Masaru Onchi, Junjiro Kai
1959 Volume 1959 Issue 12 Pages
69-71
Published: March 31, 1959
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There have been observed a series of line groups on some mass spectrograms taken by our Mattauch-type mass spectrograph with a high-frequency discharge ion source. Any one of the line groups can be correlated with a group of n-atomic element ions formed by random grouping of n isotopic atoms of the element used as electrodes, because the number of lines, their exact positions on the spectrogram, and the approximate relative densities can be calculated from the number of isotopes of the element, their mass numbers, and their relative abundances. Thus n has been found to vary from 2 through 11 for C(Graphite), 2 through 7 for Si, 2 through 4 for Ge, 2 and 3 for Se. No multiply charged polyatomic ion has been observed. The logarithm of the relative abundance of the polyatomic ion vs n curve seems to be better represented by two separate descending curves for the even-membered and the odd-membered ions respectively.
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Yoshio Kubota, Akira Mizuoka, Hiroshi Takeda
1959 Volume 1959 Issue 12 Pages
71-74
Published: March 31, 1959
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Analyses of trace impurities in SO2 were undertaken with the mass spectrometer and the gas chromatography. From the analyses of samples obtained from different commercial“high grade”SO2 bombs, the main components of trace impurities were estimated to be CO2, N2 and O2, in the order of magnitudes of 10
-3%. In both qualitative and quantitative analyses of trace amount of N2 and O2 in SO2 gas chromatography with D. 0. P. on fire brick and molecular sieve 4A as columns, was superior to mass spectrometry with which O2 spectrum is obscured by the cracking patterns of SO2.
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Toshio Takai, Tatsuya Tsutida
1959 Volume 1959 Issue 12 Pages
75-77
Published: March 31, 1959
Released on J-STAGE: March 01, 2011
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Administering orally 254.6 mg of N
15-labeled Ammonium Citrate(40 atomic % excess)to a healthy female infant of 3 and 1/6 years old with the body weight of 11 kg, the authors studied the excretion rate of N
15during 3 days period. The excretion of the administered N
15in the urine was observed to reach a state of saturation in about 2 days and the excretion rate was approximated by an exponential function. From the analysis of the results, it was estimated that roughly about 56% of the administered N
15was excreted in about 2 days. The measurement of the N
15atomic % excess was carried out by Prof. Hayakawa of Osaka Prefectural University with the Hitachi mass spectrometer of RM-C type.
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Shun Araki
1959 Volume 1959 Issue 12 Pages
78-82
Published: March 31, 1959
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Teruo Hayakawa
1959 Volume 1959 Issue 12 Pages
83-85
Published: March 31, 1959
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1959 Volume 1959 Issue 12 Pages
97a
Published: 1959
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1959 Volume 1959 Issue 12 Pages
97b
Published: 1959
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1959 Volume 1959 Issue 12 Pages
97c
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1959 Volume 1959 Issue 12 Pages
97d
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1959 Volume 1959 Issue 12 Pages
97e
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1959 Volume 1959 Issue 12 Pages
97f
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1959 Volume 1959 Issue 12 Pages
97g
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1959 Volume 1959 Issue 12 Pages
97h
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1959 Volume 1959 Issue 12 Pages
97i
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1959 Volume 1959 Issue 12 Pages
97j
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1959 Volume 1959 Issue 12 Pages
97k
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1959 Volume 1959 Issue 12 Pages
97l
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1959 Volume 1959 Issue 12 Pages
97m
Published: 1959
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