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Volume 27, Issue 7
Displaying 1-13 of 13 articles from this issue
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Tetsutaro HONDA, Kenji TAKEDA, Masayasu NOGUCHI1978 Volume 27 Issue 7 Pages 367-372
Published: July 15, 1978
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSThe peak efficiencies for volume samples in γ spectrometry of environmental radioactive materials have been determined using a radioactive standard point source. The advantages of the method, as compared with the conventional calibration method using standard volume sources, are as follows; 1) The peak efficiencies can be obtained with high accuracy and precision, 2) To be applied easily to any sample container being axial symmetry, 3) The correction for selfabsorption can be performed by the simple calculation. On the other hand, the application of the method is restricted to only the cylindrical or coaxial detector.View full abstractDownload PDF (688K) -
Yoshihide KONDO1978 Volume 27 Issue 7 Pages 373-378
Published: July 15, 1978
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSWe intend to make clear the characteristics of cyclic activation method with 16-Me V bremsstrahlung. The experiment was performed with an electron LINAC, using a sample transfer system. A Ge (Li) detector was used for the measurement of γ-ray spectra from activated 16 elements. All the γ-ray peaks detected were due to nuclides formed by (γ, γ') or (γ, n) reaction. Sensitivities were calculated for 27 nuclides with half-lives of 0.8 sec to 32 min.
The experimental parameters were discussed to obtain satisfactory results. (1) In the settings of ta=tc=28 sec, tt=tt′=2 sec, T=60 sec and nT≤18000 sec, where ta, tc, tt (tt′) and T are activation, counting, sample transport and cycle period times, respectively, the cyclic activation method is effective, when the half-life of product nuclide T1/2=5-2600 sec and when the total experiment time nT is changed according to the half-life. Also the relationship nT≥7T1/2 must be satisfied in this method. (2) For given values of tt, tt′ and nT, the optimum number of cycles n must be selected according to the half-life of product nuclide to accumulate the count efficiently. In this case the value of T is also changed. (3) For given values of ta, tc, tt, tt′ and T, the optimum n value must be determined as in (2), (4) The sensitivity increases by about one order on average for each element, when the value of n is changed from 5 to 300 cycles for the same settings of ta-tc=28 sec, tt-tt′=2 sec and T=60 sec.View full abstractDownload PDF (723K) -
Sumiko NAGATSUKA, Yoshiyuki TANIZAKI1978 Volume 27 Issue 7 Pages 379-383
Published: July 15, 1978
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSA simple preconcentration procedure for mercury and copper was examined in the activation analysis of water samples.
The preconcentration using pure activated carbon has been reported in several papers. The authors found that the carbon powder for emission spectroscopic analysis showed the high purity equivalent to pure activated carbon. The influence of various parameters in adsorption conditions was studied by radioactive tracers 197Hg and 64Cu. It was confirmed that 100% of these elements were adsorbed on carbon powders as pyrrolidine dithiocarbonate complexes at an acidity of pH 6-8, the temperature of 50°C and the stirring time of 30 minutes.
This method was applied to the activation analysis of the river water samples taken from the upper stream area of the Arakawa river and the ground water samples taken from the wells of the environs of Tokyo Megalopolis. The carbon powders which adsorbed these elements were filtered, dried and analyzed by instrumental neutron activation analysis. The Hg concentrations of 0.01-0.1 ppb in river water and 0.03-1.4 ppb in ground water were obtained as well as the Cu concentrations of 0.3-3.0 ppb in ground water.
The limits of determination of this method are 0.01 ppb Hg and 0.2 ppb Cu in the case of 1 l sample of fresh water.View full abstractDownload PDF (523K) -
Hisashi KATO, Hiroto KOGURE, Katsuhiro TACHIKAWA1978 Volume 27 Issue 7 Pages 384-389
Published: July 15, 1978
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSTo establish the production technique of 60Co sources with high specific activity, test production was started in 1967 by using JRR-3 and JMTR reactors. Two kinds of cobalt targets, a wafer type (diameter 8.0 mm × thickness 2.3 mm, 1.1 g) and a pellet type (diameter 1.0 mm × length 1.0 mm, 6.9 mg) were used. The former was irradiated at a maximum nvt of 4.4×1020 neutrons per cm2, yielding a maximum specific activity of 8.5 Ci per gram, and the latter at 2.2×1021 neutrons per cm2, yielding a maximum specific activity of 68.1 Ci per gram, and the total activity of 60Co sources amounted to 4.1 kCi. After the 60Co sources were enclosed in stainless steel capsules, these sealed sources were submitted to wipe and immersion tests to examine surface contamination and leakage. Through the test production, could be obtained much important knowledge such as irradiation method, handling of highly active materials, sources assemblage and remote welding.View full abstractDownload PDF (751K) -
Michiko KAMADA1978 Volume 27 Issue 7 Pages 390-396
Published: July 15, 1978
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSLocalization of 67Ga in various tissues was demonstrated by whole-body autoradiography of tumor-bearing mice in order to obtain comprehensive information which would aid in making more accurate interpretations of clinical scintigrams.
The macroautoradio grams (ARG's) showed the most intense accumulation of 67Ga in the reticuloendothelial tissues, the wall of the intestinal tract and tumor tissues.
67Ga nonspecifically accumulated in the abdominal region and was apparently excreted mostly from the kidneys and from the mucosa, of the intestinal tract. In the reticuloendothelial system such as bone marrow, liver tnd lymph nodes were sometimes difficult to distinguish from the lung tumor. In the 67Ga-scintigram the high uptake of 67Ga was seen in these organs. Tumor in the lung could be readily detected as the alveolar structure is occupied with a considerable amount of air and has much, lawer activity per unit volume in the normal.lung tissue. Thus the application of 67Ga in autoradiography in experimental animals provided useful information which should assist in analyzation of routine 67Ga-scintigrams in patients with neoplastic diseases.View full abstractDownload PDF (4826K) -
Takehiro NISHIDAI, Yoshio KATO, Kanji TORIZUKA, Masao FUKUNAGA, Yasuhi ...1978 Volume 27 Issue 7 Pages 397-399
Published: July 15, 1978
Released on J-STAGE: July 21, 2010
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Takashi MAKITA, Masanori HATUOKA, Koji SASAKI, Yasukazu HARADA1978 Volume 27 Issue 7 Pages 400-403
Published: July 15, 1978
Released on J-STAGE: July 21, 2010
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Hisashi BUNKO, Norihisa TONAMI, Kinichi HISADA1978 Volume 27 Issue 7 Pages 404-406
Published: July 15, 1978
Released on J-STAGE: July 21, 2010
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Masayuki NAKAJO, Hiromichi SAKATA, Shinji SHINOHARA1978 Volume 27 Issue 7 Pages 407-409
Published: July 15, 1978
Released on J-STAGE: July 21, 2010
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Masanobu SAKANOUE1978 Volume 27 Issue 7 Pages 410-421
Published: July 15, 1978
Released on J-STAGE: July 21, 2010
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Tokuhiro OHNISHI, Eiichi HIRAOKA, Junichiro FURUTA1978 Volume 27 Issue 7 Pages 422-426
Published: July 15, 1978
Released on J-STAGE: July 21, 2010
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(3) Activation Analysis of Minor Elements in Plant Materials (1)Masao SHIBUYA1978 Volume 27 Issue 7 Pages 427-432
Published: July 15, 1978
Released on J-STAGE: July 21, 2010
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1978 Volume 27 Issue 7 Pages A1835-A1342
Published: July 15, 1978
Released on J-STAGE: July 21, 2010
JOURNAL FREE ACCESSDownload PDF (3422K)
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