RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
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Volume 31, Issue 6
Displaying 1-9 of 9 articles from this issue
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  • Simultaneous Measurement of 32P and 33P Double-labelled Sample by Liquid Scintillation Counter and its Application to Phosphorus Compounds Separated by Paper Chromatography
    Yasuko SASAKI, Yasuhiro ARIMA, Kikuo KUMAZAWA
    1982 Volume 31 Issue 6 Pages 279-284
    Published: June 15, 1982
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.31.6_279
    JOURNAL FREE ACCESS
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    Simultaneous determination of 32P and 33P radioactivities was carried out with the liquid scintillation counter (Aloca LSC 670) . For the quenching correction, the channel ratio method was used, and the proper gain and window level were set to get the maximum performance number or Klein-Eisler value.
    Using this method the radioactivities of the 32P and 33P double labelled compounds which were separated with paper chromatography were determined. New index, RSA (relative specific activity, i.e. 32P/33P) was proved to be effective as well as specific activity for the studies of the transport and metabolism of phosphorus compounds in the plant roots.
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  • Sensitivity and Precision of the 13C-Breath Test
    Makiko SUEHIRO, Masahiro IIO, Junji MORIKAWA
    1982 Volume 31 Issue 6 Pages 285-289
    Published: June 15, 1982
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.31.6_285
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    Sensitivity and precision of the 13C-breath test were assessed by examining a couple of limiting factors caused by the sensitivity of the instrument used for 13CO2 analysis, endogenous fluctuation of 13CO2 abundance, and the residual CO2 in sample storing tubes, vacutainers, etc.
    For 13CO2 analysis, a mass spectrometer equipped with a dual inlet, a dual collector, and an automated pressure matching system, was used. 15 ml vacutainers were used for sample storage. Endogenous fluctuation of 13CO2 abundance, however, was measured by putting the breath samples directly into the evacuated CO2 purification system, instead of using vacutainers.
    Endogenous fluctuation (S.D.=0.202‰) was the most significant limiting factor, compared with instrumental limitation (0.085‰), or with influence of the residual CO2 (0.136‰) . Consequently, the sensitivity of the 13C-breath test was figured out to be 0.52‰. This sensitivity is about 1, 000 times lower than that of 14C-breath test.
    The precision was linearly dependent on 13C increase from basal 13C observed after administration of 13C enriched compounds, Δ13C, and was determined to be expressed as 1.94 Δ13C.
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  • A Technique for Quantifying Lung Uptake of 201Ti on the Scintigram with 201TICI
    Tadashige FUJII, Jiro HIRAYAMA, Hisakata KANAI, Kenjiro HANDA, Shozo K ...
    1982 Volume 31 Issue 6 Pages 290-296
    Published: June 15, 1982
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.31.6_290
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    On intravenous administration of 201TlCl (74 MBq (2 mCi) ), initial transit of it through the heart as well as subsequent uptake by the chest were recorded in the supine position using a scintillation camera coupling to a small digital computer, and remaining the patient in the same position perfusion scintigram with 99mTc-macroaggregated albumin (MAA) or transmission scintigram with a point source of 99mTcO4- too.
    The radioactivity of total injected dose of 201Tl (T) was calculated from the entire region on the initial transit of the tracer bolus through the heart, and that of unilateral lung (L) was done from the anterior image of 201Tl on which isocount map of the perfusion image or transmission one was superimposed. By these procedures, the lung uptake ratio of 201Tl was calculated by ratio of L/T, and expressed as percentage per entire unilateral lung and mean value (%) per pixel.
    The average values of the lung uptake ratio in circulatory diseases were 4.0 ± 1.2% in the right lung, 2.7±1.2% in the left lung, and in respiratory diseases 4.5±2.1% and 2.3±1.0%, respectively.
    This technique is useful to quantify the lung uptake of 201Tl on the lung scintigram with 201TlCl.
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  • RCT Image Study by Angular Interval of Sampling
    Yoshihisa AKIYAMA, Nobuharu YUI, Fujimi KINOSHITA, Masaki KOAKUTSU, Ka ...
    1982 Volume 31 Issue 6 Pages 297-301
    Published: June 15, 1982
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.31.6_297
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    A multi-purpose gamma camera system which had 2 detectors of opposed position and was capable of radionuclide computed tomography (RCT) imaging was installed in Division of Nuclear Medicine, Chiba Cancer Center Hospital. In this study, the variance of RCT image due to the angular interval of sampling was analized.
    The full width at half maximum (FWHM) and full width at tenth maximum (FWTM) of point source were almost same for all sampling intervals investigated. The distortion of RCT images with uniform activity source could not be detected even for larger intervals. When the RCT images were obtained using a phantom contained 3 line sources and a bar phantom for RCT which were located at right angle with the plane of reconstruction, the images did not change between 1° and 6° of sampling interval, but for 9° or more the distortion of images occured explicity.
    For our system, sampling interval of 2° was predicted from the theorectical calculation considering both resolution and statistical noise. But, results from the phantom studies of present work showed that sampling interval of 6° was sufficient to reconstruct RCT images without distortion, and could be applicable to dynamic RCT images.
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  • Simple Method for the Breakage Examination of 226Ra Sealed Sources by Liquid Scintillation Counter
    Nobuaki MATSUOKA, Yoshimasa TAKASHI
    1982 Volume 31 Issue 6 Pages 302-304
    Published: June 15, 1982
    Released on J-STAGE: July 21, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.31.6_302
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  • Utilization of Isotopes for Groundwater Problems
    Shigehiko KIMURA
    1982 Volume 31 Issue 6 Pages 305-313
    Published: June 15, 1982
    Released on J-STAGE: July 21, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.31.6_305
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  • Current Trends in the Development and Applications of Sealed Radiation Sources and Isotope Gauges in Japan (III)
    Hideyo SUZUKI, Masami SHIMIZU
    1982 Volume 31 Issue 6 Pages 314-320
    Published: June 15, 1982
    Released on J-STAGE: July 21, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.31.6_314
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  • Use of the Stable Isotopes in Life Science (VI) 13CO2 Analysis for the 13C-Breath Test
    Makiko SUEHIRO, Masahiro IIO
    1982 Volume 31 Issue 6 Pages 321-329
    Published: June 15, 1982
    Released on J-STAGE: July 21, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.31.6_321
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  • [title in Japanese]
    1982 Volume 31 Issue 6 Pages A35P-A56M
    Published: June 15, 1982
    Released on J-STAGE: July 21, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.31.6_A35P
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