RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
Volume 30 , Issue 2
Showing 1-14 articles out of 14 articles from the selected issue
  • Tatsuo HOSHI
    1981 Volume 30 Issue 2 Pages 67-72
    Published: February 15, 1981
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    Approximation formulas on energy, dose and energy absorption buildup factors were constructed to facilitate the computation of the values in a material irradiated with a point isotropic gamma-ray source. The approximation formulas were expressed as a function of the effective atomic number (Z), gamma-ray energy (E) and relaxation length in mean free path (fur), with 15 or 17 coefficients.
    The approximate values were compared with the buildup factors reported by Goldstein and Wilkins in the range of Z, E and fir adopted for gamma-ray irradiator design, that is in 7.42≤Z≤26, 0.5≤E (MeV) ≤4 and 0≤μγ≤10. It was shown that the maximum relative errors of the approximation formulas are ±5.20, ±4.3% and ±3.5% for energy, dose and energy absorption buildup factor, respectively.
    Download PDF (652K)
  • Yasuro ATO, Soji MIYAGAWA
    1981 Volume 30 Issue 2 Pages 73-79
    Published: February 15, 1981
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    Relative scientillation efficiencies of various phosphors such as ZnS, ZnCdS and Zn2SiO4 under excitation by a-rays from 210Po, β-rays from 90Sr-90Y were compared with those excited by 365 nm (3650Å) UV light. The influence on the structure, mixture rate, firing atomosphere and firing temperature of phosphors on the efficiency were noted. The results were as follows:
    (1) ZnS type phosphors generally showed the highest efficiencies under all types of excitation examined.
    (2) Among ZnS: Cu type phosphors, the specimen fired at 1100°C was the most efficient under the three types of excitation.
    (3) A highly efficient phosphor in photoluminescence was not always efficient in scintillation.
    (4) The addition of a flux was generally effective for scintillation as for photoluminescence.
    (5) The phosphors fired in H2S showed a lower efficiency than those fired in air on N2 in both scintillation and photoluminescence.
    Download PDF (758K)
  • Noriko MOTOHASHI, Mineko TERAO, Itsuhiko MORI
    1981 Volume 30 Issue 2 Pages 80-85
    Published: February 15, 1981
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    The labeling reactions of L-lysine and poly-L-lysine (average of molecular weight: 3400 (I), 15000 (II), 25000 (III) and 87000 (IV) ) with57Co2+ions and the tumor and organ distributions of their complexes were examined. L-Lysine and poly-L-lysine with 57Co2+ions were incubated for 20 hrs at 30°C in the solution of pH 9.0 and 50 v/v % ethanol solution of pH 10.5, respectively. L-Lysine and poly-L-lysine were labeled with 57Co2+ions in the radiochemical yields of over 95 and 60-70%, respectively. The radioactive polypeptides were separated from unreacted 57Co2+ions in the range of pH 8.0 to 8.5 by means of gel filtration on Sephadex G-25 M column (1.5×5.0 cm) .
    The radioactive complexes were injected intavenously in mice. L-Lysine complex was excreted rapidly from tumor tissue and various organs. The localization of poly-L-lysine complexes in tumor was higher 3 to 5 times than that of L-lysine complex at 20 hrs after injection. The localization in tumor increased in the order of L-lysine-<II-<I-complex. II-Complex was excreted scarcely from tumor. 57Co poly-L-lysine complexes revealed remarkably high localization in liver and spleen. The localization in tumor of those complexes seemed to be related to the molecular weight and the positive charge of lysine.
    Download PDF (703K)
  • Yukio MORI, Toshiro NIWA, Kazumi TOYOSHI
    1981 Volume 30 Issue 2 Pages 86-91
    Published: February 15, 1981
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    3'-Hydroxymethyl-4- (dimethylamino) azobenzene (I), a new potent hepatocarcinogen, and 3, 3'-bis (hydroxymethyl) azobenzene (II) were labeled with multiple-deuterium for the purpose of investigating their metabolisms by the ion cluster technique. I-d4 was obtained in a 22% yield from benzoic-d5 acid (99 atom% D) by nitration, catalytic hydrogenation, reduction, and coupling of the diazonium salt with N, N-dimethylaniline and its deuterium content was 99 atom%. On the other hand, II-d8 was obtained in a 7% yield from 3-nitrobenzoic-d4 acid by reduction and was 91 atom% D.
    Download PDF (515K)
  • Yuko MIURA, Iwao KANNO, Shuichi MIURA, Takenori HACHIYA, Eiichi HAGAMI ...
    1981 Volume 30 Issue 2 Pages 92-98
    Published: February 15, 1981
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    Noninvasive measurement of regional cerebral blood flow (rCBF) by 133Xe inhalation and simulation studies of the errors in analyzing 133Xe clearance curves were reported. Our system was based on Obrist's 10 minutes desaturation method after 1 minute inhalation of 185-222 MBq (5-6 mCi) /l of 133Xe gas mixed in the air. Clearance curves were simultaneously measured at six location in each hemisphere. End-tidal 133Xe curve used for correction of recirculation was generated from respired air curve. Values for rCBF were calculated by two compartment analysis of the head curves.
    We evaluated the experimental errors with computer simulation studies. The synthetic head curves were generated with a three compartmental model representing the fast and slow component in the brain and the extracerebral component. The arterial input function used was the end-tidal curves of a typical control subject. The results of computer simulation studies were obtained as follows: F1 that is the flow of the fast compartment in brain and adequate reliability; statistical errors for normal value of F1 (80ml/100 g/min) were 5% at 30 kcpm; the optimum end point of curve-fitting was 10-11 minutes after 1 minute inhalation of 133Xe gas; the error due to remaining activities of repreceding study was 3% at the interval of 25 minutes between inhalation.
    Download PDF (865K)
  • Junichi NISHIKAWA, Kikuo MACHIDA, Jun ISHIMARU, Akira TASAKA
    1981 Volume 30 Issue 2 Pages 99-103
    Published: February 15, 1981
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    Radionuclide Computed Tomography (RCT) was performed in 40 cases with various liver diseases. Indication of RCT was determined by the fact that usual liver scintigrams showed or suspected space-occupying lesion. In diffuse hepatocellular disease, RCT added diagnostic informations in 10 out of 17 cases. In these patients, RCT referred decreased uptake area to morphological change such as prominent porta hepatis, widening of both lobes or lateral seg. and medial seg. of the left lobe, and so on. In cases with liver tumor, RCT demonstrated the liver by axial plane, so one could easily or precisely diagnose the location of the mass. RCT performance requires only 30 min. additionally, and no additional injection. We conclude RCT should be performed to the patients whose liver scintigrams show or suspect space-occupying lesion.
    Download PDF (7073K)
  • Aiji YAMATO
    1981 Volume 30 Issue 2 Pages 104-108
    Published: February 15, 1981
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    Measurements of 239, 240pu and 90Sr were performed on air-dust samples collected by means of filtration with cellulose-asbestos filter at Ibaraki prefecture, Japan during 1974 to 1979. The ranges of 239, 240Pu and 90Sr content determined in these samples are 0.041-1.9μBq/m3-air (1.1-52 aCi/m3) and 2.3-87 μBq/m3-air (0.062-2.3 fCi/m3) respectively. The activity ratios of 239, 240Pu/90Sr are found to be in a range between 0.008 to 0.026 with a mean value of 0.017.
    General trend on time variation of the content of 239, 240Pu and 90Sr in the surface air was in similar pattern each other. The content of these nuclides increased after the Chinese nuclear test explosions, and also in spring seasons with the exception of a few cases.
    Download PDF (532K)
  • Yasuyuki MAKI, Fujio TANAKA
    1981 Volume 30 Issue 2 Pages 109-111
    Published: February 15, 1981
    Released: July 21, 2010
    JOURNALS FREE ACCESS
    Download PDF (376K)
  • Yasuro ATO, Hideharu MATSUDA, Tatsuro KAWASHIMA, Soji MIYAGAWA, Ryoiti ...
    1981 Volume 30 Issue 2 Pages 112-114
    Published: February 15, 1981
    Released: July 21, 2010
    JOURNALS FREE ACCESS
    Download PDF (365K)
  • Shuichi MIURA, Iwao KANNO, Yuko MIURA, Kazuo UEMURA
    1981 Volume 30 Issue 2 Pages 115-118
    Published: February 15, 1981
    Released: July 21, 2010
    JOURNALS FREE ACCESS
    Download PDF (407K)
  • Setsuko SATO, Shigeko KURIHARA, Sachiko KOIKE, Kiyoko KUSAKABE, Hirosh ...
    1981 Volume 30 Issue 2 Pages 119-121
    Published: February 15, 1981
    Released: July 21, 2010
    JOURNALS FREE ACCESS
    Download PDF (321K)
  • Tetsuya KAMEI, Toshie YAMAZAKI, Ikuro TATSUNO
    1981 Volume 30 Issue 2 Pages 122-124
    Published: February 15, 1981
    Released: July 21, 2010
    JOURNALS FREE ACCESS
    Download PDF (311K)
  • Kunisuke TANAKA, Zenzaburo KASAI
    1981 Volume 30 Issue 2 Pages 125-134
    Published: February 15, 1981
    Released: July 21, 2010
    JOURNALS FREE ACCESS
    Download PDF (6428K)
  • 1981 Volume 30 Issue 2 Pages A2097-A164
    Published: February 15, 1981
    Released: July 21, 2010
    JOURNALS FREE ACCESS
    Download PDF (3913K)
feedback
Top