RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
Volume 45 , Issue 10
Showing 1-13 articles out of 13 articles from the selected issue
  • Yoshiyuki SHIRAKAWA, Kiyomi HORIKOSHI, Hiro AMANO
    1996 Volume 45 Issue 10 Pages 605-612
    Published: October 15, 1996
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    A distance measurement method to make use of Compton scattering of gamma-ray was proposed. This method treated two cases. Concretely, the case that density of a measured object was constant and the case that the density was changed were examined.
    A source and a detector are set up at the same side of the object. When density is not varied, the amount of scattered gamma-ray is not depending on a distance. However, the number of gamma-rays detected becomes a function of distance. The function is in proportion to the solid angle to the detector from the efficient center of a scattering region. On the other hand, in the case that density is changed, the number of scattered gamma-rays is altered by density. Hence the number becomes a function of distance and density. Dual detectors are located at different positions and we make two equations on relation of detected gamma-rays, distance and density. Here if the count of gamma-rays detected is given, both distance and density can be calculated.
    By using computer simulations and experiments, a performance of the method was evaluated. As a result, the precision of the distance measurement was ±3% within a range of 10-100 cm in constant density. In the case that the density is changed with a range 1.707-1.885 g/cm3, the accuracy of this method was ±1 mm within a range of 8-10 cm.
    Download PDF (720K)
  • Naoki KANO, Makoto NIHEI, Hiroshi IMAIZUMI
    1996 Volume 45 Issue 10 Pages 613-618
    Published: October 15, 1996
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    In order to reveal the behavior of hydroxyl group in isotope exchange reaction, OT-for-OH exchange reaction between each anion-exchange resin (OH- form) and tritiated water (abbreviated as HTO water below) was observed at 80°C under the equilibrium. Anion-exchange resins used were Amberlite IRA-400, IRA-410 (both strongly basic), and IRA-94S (weakly basic) . It can be thought that an HTO molecule dissociates into H++OT- (or T++OH-) . The activity of each resin based on OT-for-OH exchange reaction was measured with a liquid scintillation counter.
    From the above-mentioned, the following five were found. (1) Isotope exchange reaction as “atomic group” occurred between the OH group in each anion-exchange resin and the OT group in HTO water. (2) The reactivity of strongly basic anion-exchange resin is larger than that of weakly basic one. (3) The ratio of the reactivity of these resins can roughly be expressed as follows: (IRA-410) : (IRA-400) : (IRA-94S) =42: 7: 1. (4) The degree of OT-for-OH exchange reaction may be smaller than that of T-for-H exchange reaction. (5) The method used and results obtained in this work may be helpful to obtain the data for the prevention of T-contamination, especially to obtain the data from certain atomic groups including T.
    Download PDF (650K)
  • Susumu MINATO
    1996 Volume 45 Issue 10 Pages 619-625
    Published: October 15, 1996
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    Statistical analyses were performed for 50 sets of equal interval data of natural terrestrial gamma-ray dose rates observed for various distances. The multiple regression analysis shows that the variance of a set of data can be expressed as a function of the length and the mean value of the data with relatively high correlation coefficient. One-dimensional spectral analyses for the 50 sets of data suggest that the structures of fluctuation are similar to one another for various distances of observation starting from 0.1 km to about 7 000 km. Each power spectral density can be approximated in the form of P (k) =0.780×10-3 m2.20 k-1.18 where k (cycle/km) and m (nGy/h) are the wave number and the mean, respectively.
    Download PDF (617K)
  • Toshiyuki NISHIMAKI, Yasuhiro SAKAI, Senichi FURUDATE
    1996 Volume 45 Issue 10 Pages 626-630
    Published: October 15, 1996
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    Isotope 125I in animal experiments is used for several purposes. One major problem with using 125I is to handle it extremely carefully. The careful handling is required when using 125I in animal experiments because of its higher evaporation and difficulty for sealing. When conducting animal experiments while using 125I, we have encountered several serious problems but have devised new techniques and methods for a long time. In this paper, we will describe the safety handling for requirements based on our experiments. The newly devised safety handling procedures are the following : (1) a device for protecting isotope contamination during the preparation of the injectable solution, (2) collection method of airborne radioactivity from the animals that were injected, (3) enhancing the method for autoradiography of the whole body, (4) finding of elusion of 125I from the tissues during fixative process, (5) estimation of the exposed time for light microscopic autoradiography.
    Download PDF (5637K)
  • Tadashi MIURA, Sukehiko KOGA
    1996 Volume 45 Issue 10 Pages 631-639
    Published: October 15, 1996
    Released: July 21, 2010
    JOURNALS FREE ACCESS
    Download PDF (1120K)
  • Yasuhiko FUJII
    1996 Volume 45 Issue 10 Pages 640-645
    Published: October 15, 1996
    Released: July 21, 2010
    JOURNALS FREE ACCESS
    Download PDF (692K)
  • Isamu ISHIKAWA
    1996 Volume 45 Issue 10 Pages 646-651
    Published: October 15, 1996
    Released: July 21, 2010
    JOURNALS FREE ACCESS
    Download PDF (597K)
  • Yasuhiro MASUDA
    1996 Volume 45 Issue 10 Pages 652-655
    Published: October 15, 1996
    Released: July 21, 2010
    JOURNALS FREE ACCESS
    Download PDF (393K)
  • [in Japanese], [in Japanese], [in Japanese], [in Japanese]
    1996 Volume 45 Issue 10 Pages 657-658
    Published: October 15, 1996
    Released: July 21, 2010
    JOURNALS FREE ACCESS
    Download PDF (250K)
  • [in Japanese]
    1996 Volume 45 Issue 10 Pages 659-660
    Published: October 15, 1996
    Released: July 21, 2010
    JOURNALS FREE ACCESS
    Download PDF (310K)
  • [in Japanese]
    1996 Volume 45 Issue 10 Pages 661-662
    Published: October 15, 1996
    Released: July 21, 2010
    JOURNALS FREE ACCESS
    Download PDF (321K)
  • [in Japanese]
    1996 Volume 45 Issue 10 Pages 663-664
    Published: October 15, 1996
    Released: July 21, 2010
    JOURNALS FREE ACCESS
    Download PDF (297K)
  • Immunoassay Research Society of Japan
    1996 Volume 45 Issue 10 Pages i-xiv
    Published: October 15, 1996
    Released: July 21, 2010
    JOURNALS FREE ACCESS
    Download PDF (1442K)
feedback
Top