RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
Volume 48, Issue 5
Displaying 1-9 of 9 articles from this issue
  • Tetsuaki NISHIDA, Keisuke MAKI, Motoshi SETO
    1999 Volume 48 Issue 5 Pages 313-319
    Published: May 15, 1999
    Released on J-STAGE: March 10, 2011
    JOURNAL FREE ACCESS
    Aluminophosphate glass with a batch composition of 30 CaO⋅15 A12O35 Fe2O325 PbO⋅25 P2O5 was prepared as a potential host for the high-level nuclear wastes. This“base glass”consists of highly heat-resistant 60CaO⋅ (40-x) A12O3⋅xFe2O3 glass and water-resistant lead metaphosphate glass, Pb (PO3) 2, which is known to have -103 times higher water-resistivity than conventional borosilicate glass. Two crystallization temperatures (Tc) of 650-671 and 668-693°C were determined from the differential thermal analysis (DTA) of the“base glass”. Large activation energies of 4.2 and 4.9 eV were obtained from a Kissinger plot of the Tc values. Nuclear waste“model glass” containing 10 stable isotopes with the mass numbers of 90-100 (Sr, Y, Zr, Nb, Mo) and 135-145 (Ba, La, Ce, Pr, Nd) also shows high heat-resistivity. 57Fe Mössbauer spectrum indicates that Fe (III) and Fe (II) are ionically bonded to distorted PO4 tetrahedra at the sites of network modifier.
    Download PDF (725K)
  • —Estimation of the Distribution of Low Energy β-Emitter Using the Imaging Plate—
    Yasuhiro YUMOTO, Tadashi HANAFUSA, Tomohiro NAGAMATSU, Shigeru OKADA
    1999 Volume 48 Issue 5 Pages 320-326
    Published: May 15, 1999
    Released on J-STAGE: March 10, 2011
    JOURNAL FREE ACCESS
    We want to establish a system of volume reduction by the incineration of the combustible radioactive solid wastes from radioisotope usage at the utilization facility. We have been performing experiments using an experimental incineration system to examine the distribution of radionuclides during incineration and to collect basic data. To reproduce the realistic conditions of incineration of low-level radioactive wastes in an experimental system, we adopted new incineration methods in this study. Low level radioactive samples (LLRS) were set up in a mesh container of stainless steel and incinerated at high temperature (over 800°C) generated by two sets of high calorie gas burners. Low energy β-emitters 35S, 45Ca, 33P, and a high energy β-emitter 32P were used for the experiment. Their translocation percentages in exhaust air and dust were estimated using the Imaging Plate. Distribution of radionuclides during the incineration was similar to that estimated by conventional methods by our study or to that reported in incineration of liquid scintillation cocktail waste. We concluded that the use of the Imaging Plates is a simple and reliable method for estimation of the distribution of low energy β-emitters in incineration gas and ash.
    Download PDF (630K)
  • Susumu MINATO
    1999 Volume 48 Issue 5 Pages 327-333
    Published: May 15, 1999
    Released on J-STAGE: March 10, 2011
    JOURNAL FREE ACCESS
    The method of calibrating a portable surveymeter for air absorbed dose rates of natural environmental gamma-rays and cosmic-rays is described. The records taken for a week for seven people leading their respective normal lives are discussed. Examples of measurements taken during domestic journeys and overseas trips are presented. It is emphasized that these kinds of data are important for (1) re-evaluation of the population doses, (2) discovery of anomalous man-made radioactivity in the living environment, such as from building materials containing contaminated recycled steels, and (3) educating the public about radiation.
    Download PDF (696K)
  • Kazutaka EJIRI, Kazuyuki MINAMI, Kazuo SUZUKI, Kaoru KIKUKAWA, Aiko NA ...
    1999 Volume 48 Issue 5 Pages 334-340
    Published: May 15, 1999
    Released on J-STAGE: March 10, 2011
    JOURNAL FREE ACCESS
    In order to estimate the effective dose (E) of a person who may come into close contact to the 99mTc-GSA patients. Radiation dose rates around 21 adult patients (male: 14, female: 7) were measured with three ionization surveymeters (Aloka, ICS-301) at distances of 0.05, 0.5, 1.0 and 1.5 m from the patients. Measurements were carried out at 0.75, 3.0, 6.0 and 24.0h after the administrations of 99mTc-GSA.Surveymeters were set up to the first cervical vertebrae (Level I), xiphoid process (Level II) and anterior superior iliac spine (Level III) of the patients with their standing erect, The maximum dose equivalent (Hlcm) rate of 64.98μSvh-1 per 185 MBq was recorded in the LevelII. Effective half life of 99mTc-GSA was 5.8h. Total E around the patients were calculated by the initial Hlcm rates and the effective half life. Total E were 285, 62, 23 and 13μSv per 185 MBq at distances of 0.05, 0.5, 1.0 and 1.5m, respectively. E for the first 24h was corresponding to 94.3% of the total E.
    Download PDF (765K)
  • Shogo SUZUKI
    1999 Volume 48 Issue 5 Pages 341-351
    Published: May 15, 1999
    Released on J-STAGE: March 10, 2011
    JOURNAL FREE ACCESS
    Download PDF (1104K)
  • 7. Systematization of Radioluminography as a Quantitation Technique, Detection Characteristics, Validation and a Quantitative Whole Body Autoradiography
    Shigeo BABA
    1999 Volume 48 Issue 5 Pages 352-374
    Published: May 15, 1999
    Released on J-STAGE: March 10, 2011
    JOURNAL FREE ACCESS
    Download PDF (6042K)
  • [in Japanese]
    1999 Volume 48 Issue 5 Pages 375-376
    Published: May 15, 1999
    Released on J-STAGE: March 10, 2011
    JOURNAL FREE ACCESS
    Download PDF (296K)
  • [in Japanese]
    1999 Volume 48 Issue 5 Pages 377-379
    Published: May 15, 1999
    Released on J-STAGE: March 10, 2011
    JOURNAL FREE ACCESS
    Download PDF (2230K)
  • [in Japanese], [in Japanese]
    1999 Volume 48 Issue 5 Pages 380-382
    Published: May 15, 1999
    Released on J-STAGE: March 10, 2011
    JOURNAL FREE ACCESS
    Download PDF (2241K)
feedback
Top