RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
Volume 15 , Issue 5
Showing 1-15 articles out of 15 articles from the selected issue
  • Kiyoshi KUDO
    1966 Volume 15 Issue 5 Pages 209-214
    Published: September 15, 1966
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    Trace amounts of copper were determined by the quantitative isotope dilution method and the radioactivation analysis based on its principle. A radioisotope of the known specific activity (radioactivity A, carrier content M) is added to the unknown amount Mx, and m which is less than the total amount of the element is separated. By measuring the radioactivity a of the separated fraction, Mx is determined by the following equation: Mx=m⋅A/a-M. In the radioactivation analysis, the irradiated sample is divided into two parts, and M is added to one. An amount m is separated from each part, and then, a and a' are measured. The unknown amount Mx is calculated from Mx=a'M/ (a-a') . The experiment to determine the reaction ratio between copper and dithizone was carried out at various conditions and it was observed that the ratio was constant in the buffer solution of pH 5 containing 0.2-4.7μg of copper. The reproducibility of the results was satisfactory. Then, this method has been applied to the determination of trace amounts of copper in the materials and satisfactory results were obtained.
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  • Keiji KAWAI, Noriaki ITOH, Tokuo SUITA
    1966 Volume 15 Issue 5 Pages 215-220
    Published: September 15, 1966
    Released: September 07, 2010
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    Effects of impurities such as Mg++, Mn++, Ag+, Cl-, and NaCI on the thermoluminescence of LiF were studied. It was found that some combinations of impurities, Mn++ and Ag+, Mg++ and Ag+, and Ag+ and Cl- enhanced the yield of thermoluminescence of LiF remarkably, that the thermoluminescence of LiF-Ag-Mg was enhanced by addition of NaCl, and that LiF doped with Mn++ and Ag+ was given the thermoluminescence yield almost as high as that of Harshaw TLD-700. Suggestions were made on the mechanism of sensitization of thermoluminescence.
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  • Ryuhei KATO, Ryoichi ONO, Toshihiko KONO, Mikio KISHITANI, Masayoshi O ...
    1966 Volume 15 Issue 5 Pages 221-223
    Published: September 15, 1966
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    In earlier investigations, analysis of inorganic constituents of tumors has been made by optical spectroscopy and by chemical processes. This paper reports an analysis by a neutronactivation method using an atomic reactor.
    The authors found a potassium peak in the gamma-ray spectrum of activated cancer tissues taken from patients with advanced disease whereas no peak was found in other neoplasms or in the early stage of cancer.
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  • S. TASHIRO, Y. WADACHI, M. MURAMATSU
    1966 Volume 15 Issue 5 Pages 224-227
    Published: September 15, 1966
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    In the previous reports, it has been reported that the contaminability of radioisotope to the skin varied with the soiling time and the acidity of the soiling solution. This paper describes the effect of acidity of soiling solution on the contaminability to a pig skin for 35S, 204Tl, 125Sb, 147Pm and 210Po at a given soiling time. It was found that the contaminability to the skin increased with increasing pH for such cationic radioisotope as thallium and with decreasing pH for such anionic one as sulfur, and that the radioactive contaminations with antimony, promethium and polonium depended on their dissolved states which were effected specifi ally by the acidity of the soiling solutions.
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  • C. URAKAMI, R. SAKAMOTO, A. TAKADA, [in Japanese], H. TANAKA, N. FURUH ...
    1966 Volume 15 Issue 5 Pages 228-233
    Published: September 15, 1966
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    Preliminary studies were made on effects of 60Co-γ rays, at dose levels of 0.63, 1.3 and 4.5×105 rad under ice-cooling, on Natto sealed in an irrax film in relation to its appearance, flavor, carbonyl and TBA values, contents of free sugars, free amino acids, and the classes of phospholipids.
    No off-flavor appeared up to 1.3×105 rad but a pungent odor was detected at 4.5×105 rad. Such observations were reflected on the carbonyl and TBA values, i.e., no increase in the values up to 1.3×105 rad but a distinct increase at 4.5×105 rad. The content of free sugars remained unchanged at all the dose levels. A total amount of free amino acids remained unchanged up to 1.3 ×105 rad but some increase at 4.5×105 rad. Amino acid analysis showed a considerable increase in amounts of met hionine, leucine, tyrosine, arginine and phenylalanine at the highest dose level but a decrease in amounts of lysine and histidine. Irradiation did not alter the classes of phospholipids present in the beans but caused a significant change in their fatty acid composition. Some alterations occurred in the classes of phospholipids of mucilage, however; the compounds appeared to be polyphosphatidic acid and phosphatidic acid, which were absent in the control sample, were detected in the irradiated sample.
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  • [in Japanese], [in Japanese], [in Japanese]
    1966 Volume 15 Issue 5 Pages 234-236
    Published: September 15, 1966
    Released: July 21, 2010
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  • [in Japanese], [in Japanese]
    1966 Volume 15 Issue 5 Pages 237-239
    Published: September 15, 1966
    Released: July 21, 2010
    JOURNALS FREE ACCESS
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  • [in Japanese]
    1966 Volume 15 Issue 5 Pages 240-253
    Published: September 15, 1966
    Released: July 21, 2010
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  • Itsuo MORITA, Kazuo MURAKAMI, Seihei MAEKAWA
    1966 Volume 15 Issue 5 Pages 254-260
    Published: September 15, 1966
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    Combustion method as preparation of samples for liquid scintillation counting is studied. Usually, very different kinds of biological samples such as plant, animal tissues, etc, are used in studies using liquid scintillation counting. Combustion method seems to be proper to prepare these samples by reasons of its simplicity and reliability. In this method, a 3H or 14C labelled sample is combusted in an oxygen filled flask, and converted to THO or 14CO2.
    Combustion conditions for several samples and collection methods for H2O and CO2 are investigated. A circular flow collection method is applied to the collection, and collection efficiencies of more than 95% and 98% are obtained for H2O and CO2 respectively. According to these experimental results, a sample combustion apparatus is constructed as commercial product. Several examples of liquid scintillation counting measurements for samples prepared with this combustion apparatus are reported.
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  • Osamu MATSUOKA, Eiichi TANAKA, Hideo ETO
    1966 Volume 15 Issue 5 Pages 261-268
    Published: September 15, 1966
    Released: September 07, 2010
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    In the study on the biological effect of internal exposure, the evaluation of absorbed dose due to deposited radionuclide in the organ of interest is essential.
    90Sr is one of the most well studied radionuclides among the bone seeking isotopes, but its behavior in the living body is not clearly understood yet.
    The in vivo measurement of 90Sr is rather difficult since this nuclide emits only low energy (Eβ: 0.545 MeV) β-rays. The daughter nuclide, 90Y, can be measured in vivo by detecting bremsstrahlungs of its high energy (Eβ: 2.26 MeV) β-rays, and if 90Y exist in equilibrium with 90Sr, the amount of 90Sr can be determinded by the bremsstrahlung counting technique. However, it is expected that detailed behavior of 90Sr and 90Y in the living body is not so quite identical.
    To determine the amount of 90Sr in vivo, a new“γ-labelling method”has been developed: A mixture of 90Sr and small amount (2-5% in activity) of 85Sr is administered to the animal, and the γ-rays of 0.513 MeV from 85Sr is measured with a scintillation counter. The counting efficiency should be determined beforehand with the original mixture solution.
    90Y activity existing with 90Sr is measured by its bremsstrahlung effect if necessary.
    Disscussions were given as to the several technical problems in the application of γ-labelling: characteristics of bremsstrahlung measurement, optimum mixing ratio, its practicability and dose contribution, from labelling isotopes.
    This method was applied to the study of internal exposure of 90Sr on the whole-body retention of 90Sr itself. An example of the results obtained with mice was showed.
    It was demonstrated that the whole-body retention of 90Sr is influenced by administered dose level of 90Sr itself.
    The γ-labelling method is also applicable to the determination of the equilibrium ratio, 90Y/90Sr, by using the fact that the amount of 90Y can be determined separately by the bremsstrahlung counting technique with a scintillation spectrometer. By this method the equilibrium ratio, 90Y/90Sr. in a rabbit bone was determined as a function of time after admininstration of equilibrated 90Sr-90Y soeution.A 13/4inφ×2 in NaI (Tl) crystal combined with a 2 in photo-tube was used as a detector. The detector was surrounded with 1mm copper in order to cut the low-energy part of the bremsstrahlungs and to reduce the effect of the characteristic X-rays emitted from the lead shield. The pulse-height distribution was obtained with a 100 channel pulse-height analyzer. The results obtained with oral administration and with i.v, injection was showed. Although the ratios reached unity at about two weeks after administration, their transition curves showed quite different pattern depending upon the type of administration.
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  • Tohru HIRAYAMA, Komin OSADA
    1966 Volume 15 Issue 5 Pages 269-272
    Published: September 15, 1966
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    With respect to the utilization RI tracers in the field of civil engineering, a number of reports have already given on the experiments with dams which investigated the flow routes of underground water and points of leaks.
    The dam on which the present test was conducted had been considered to have widely branched outlets of underground water leaks. In order to check the volumes of such leaks, the RI dilution method was adopted on a broad scale.
    The present experiment involved a double tracer consisting of 131I plus nonradioactive sodium. The former was charged in pulse waves for comparison of the total counts and the latter was introduced intermittently for comparison of the Na concentrations. The total volumes of water leaks were estimated form these determinations.
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  • Tadashi MIYAKE, Masaichi FUKASE, Tsuyoshi KONO, Teruya YOSHIMI
    1966 Volume 15 Issue 5 Pages 273-279
    Published: September 15, 1966
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    Double radioactive tracer technique was employed for the estimation of the rates of secretion and of metabolism of dehydroepiandrosterone (DHA) and DHA sulfate in normal subjects and patients with adrenal diseases. Tracer dose of 4-14C-DHA and 7-3H-DHA sulfate were injected simultaneously into man. The urinary metabolites of DHA and DHA sulfate in the 72 hours urine after injection of radioactive tracers were isolated using various chromatographies, followed by the measurement of the specific activities of the urinary metabolites. The rate of secretion of DHA and DHA sulfate were 12.3±4.3, and 2.3±0.9 mg per day in three normal males respectively, and 9.1±6.5 and 3.7±2.5 mg per day in four normal females respectively. The rate of production of DHA and DHA sulfate were 13.6 ±4.0 and 5.0±1.6 mg per day in normal males respectively, and 11.1±5.4 and 8.7±3.9 mg per day in normal female respectively. These values were markedly increased in the patients with adrenogenital syndrome and a patient with Gushing's syndrome due to bilateral adrenal hyperplasia, especially in a four year old boy with virilizing adrenal cancer, ten to a hundredfold values were observed. While in patients with Gushing' syndrome due to adrenal adenoma, these values were within normal range.
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  • [in Japanese], [in Japanese], [in Japanese]
    1966 Volume 15 Issue 5 Pages 280-283
    Published: September 15, 1966
    Released: July 21, 2010
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  • [in Japanese], [in Japanese], [in Japanese]
    1966 Volume 15 Issue 5 Pages 284-287
    Published: September 15, 1966
    Released: July 21, 2010
    JOURNALS FREE ACCESS
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  • 1966 Volume 15 Issue 5 Pages A699-A272
    Published: September 15, 1966
    Released: July 21, 2010
    JOURNALS FREE ACCESS
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