RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
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Volume 18, Issue 4
Displaying 1-8 of 8 articles from this issue
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  • Effects of Radical Scavenger and Water on Radiolysis Reaction Velocity of C18 Unsaturated Fatty Acids
    Kazuta KITAHARA, Setsuyo YOSHINAGA
    1969Volume 18Issue 4 Pages 127-129
    Published: April 15, 1969
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.18.4_127
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    Using C18-unsaturated fatty acids such as methyl oleate, methyl linoleate and methyl linolenate, effect of radical scavenger, antioxidant and water on radiolysis reaction velocity of these substances were investigated.
    It was found that the presence of radical scavenger or antioxidant suppress radiolysis of unsaturated fatty acids, on the other hand the presence of water accelerated the reaction.
    The velocity constant of the chemical reaction obtained from the ratio of peak dimension of gas chromatograms was the secondary reaction in the former, the primary reaction in the latter; in the both case the constant was found to be proportional to the square of the number of the double bonds in unsaturated fatty acids.
    This phenomenon can be explained based on dynamics of chemical reaction.
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  • A Fundamental Study on Industrial Measurements by Means of Backscattered Gamma-Rays (Part 2)
    Measurement of Level with Collimated Gamma-Rays
    Keizo SHIBATA, Nobuo WAKABAYASHI, Mizuhiko FUJII, Katsuhiko USDA
    1969Volume 18Issue 4 Pages 130-136
    Published: April 15, 1969
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.18.4_130
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    As examples of application of backscattered gamma-rays, the measurements of thickness of vessel walls were reported in a previous paper. In this paper some methods of improving level-gauges are shown.
    When the level of the contents of a vessel is measured by means of backscattered gammarays, the vessel wall, which is usually made of heavier material than the contents, also scatters the rays.
    In this study, the collimated gamma-rays from o, r Ci of 137Cs were made to enter the steel wall of a vessel containing water, and the backscattered rays were measured with a NaI (T1) scintillation detector and a counting circuit. The scattered rays from the wall were interrupted by a detector-collimator or a small lead block. The results can be evaluated in terms of the necessary minimum value of (QT), or the product of the activity of the source Q and the time constant of the rate-meter circuit T. The value, which is derived from the limit at which it ceases by reason of the statistical fluctuation to be possible to distinguish between the counting rates with and without contents in the vessel, is calculated from the formula: (QT) min=9Q (1+k') /n' (1-k') 2, where n' and k'n' are the counting rates of the backscattered gamma-rays due to Q with and without contents in the vessel respectively. From comparison of the values, it is found that the method using the small lead block is most effective in shielding the scattered rays from the vessel wall, and therefore best suited for level-gauges. These results may be applied to density-meters, too.
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  • ERRATUM
    1969Volume 18Issue 4 Pages 135
    Published: 1969
    Released on J-STAGE: July 21, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.18.4_135
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  • Measurement of Spatial Frequency Response in γ-Ray Radiography
    —Wedge Moving Method—
    Toshiaki NOJIRI
    1969Volume 18Issue 4 Pages 137-142
    Published: April 15, 1969
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.18.4_137
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    Some components of the r-ray radiography system still leave much to be investigated with respect to the response functions of the system. A few of those components are the source, object, intensifying screen and film. The present paper describes a new method of measuring the response to 7-rays by a combination of X-ray film and Pb screen which is another component of the 7-ray radiography system.
    A wedge which absorbs 7-rays is moved back and forth in the way that its displacement is sinusoidal; thus penetrating 7-ray doses vary with time by the sine wave. The film is moved at a constant velocity across such a 7-ray beam, so that nearly sinusoidal patterns are developed upon the film as stripes. The contrast of light and shade in the strip patterns determines the response functions of the film combination. In this experiment, the depth of the 7-ray absorption varies sinusoidally but 7-ray dose variations on the film show an exponentially modulated sine wave.
    The difference between the blackness made by the genuine sine wave and that by the modulated wave and also the relation between response functions of both cases were investigated by means of Fourier expansion. The result showed about 1.5% and 5% differences in the blackness and the response value respectively. A collimated γ-ray beam was required in the experiment. In order to obtain the collimated beam, slits with narrow width were used. A correction term √1-cos2πνW/√2πνW was found where W is the width of the slit.
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  • The Whole Body Autoradiographic Studies on the Distribution of Radioisotopes (XVI)
    Distribution of a Tritium Labeled New Antitoxoplasmic Agent, 2-sulfamoyl-4, 4'-diaminodiphenyl sulfone (3H-SDDS) in Mice
    Mari SAKUMA, Yoshishige SATO
    1969Volume 18Issue 4 Pages 143-147
    Published: April 15, 1969
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.18.4_143
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    The distribution of a tritium labelled new antitoxoplasmic agent, 2-sulfamoyl 4, 4'-diaminodiphenyl sulfone (33H-SDDS) has been studied after intraperitoneal, oral and intramuscular administration in mice, using a whole body autoradiographic technique. After any administration route, 3H-SDDS was evenly distributed in the most of the tissues except the central nervous system. The radioactivity in the tissues reached their highest levels in 3-5 hours, decreased gradually thereafter, and was scarcely detected at 24 hrs after administration. The absorption was good after oral and intraperitoneal administration but delayed and gradual after intramuscular one. The main excretion routes of radioactive substances were probably via the bile and the urine. Experiment with the pregnant mice demonstrated the even distribution of radioactivity in the most of the tissues including the fetuses and placenta.
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  • [title in Japanese]
    [in Japanese]
    1969Volume 18Issue 4 Pages 148-159
    Published: April 15, 1969
    Released on J-STAGE: July 21, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.18.4_148
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  • [title in Japanese]
    [in Japanese]
    1969Volume 18Issue 4 Pages 160-170
    Published: April 15, 1969
    Released on J-STAGE: July 21, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.18.4_160
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  • [title in Japanese]
    1969Volume 18Issue 4 Pages A947-A512
    Published: April 15, 1969
    Released on J-STAGE: July 21, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.18.4_A947
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